d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
c51aa38906
freebsd-dev/sys/kern/sys_generic.c

1222 lines
26 KiB
C
Raw Normal View History

BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
*/
Converted two options over to the new scheme: USER_LDT and KTRACE.
1996-01-03 21:42:35 +00:00
#include "opt_ktrace.h"
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/param.h>
#include <sys/systm.h>
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#include <sys/sysproto.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/filedesc.h>
Don't include <sys/ioctl.h> in the kernel. Stage 4: include <sys/ttycom.h> and sometimes <sys/filio.h> instead of <sys/ioctl.h> in miscellaneous files. Most of these files have nothing to do with ttys but need to include <sys/ttycom.h> to get the definitions of TIOC[SG]PGRP which are (ab)used to convert F[SG]ETOWN fcntls into ioctls.
1997-03-24 11:52:29 +00:00
#include <sys/filio.h>
Don't #include <sys/fcntl.h> in <sys/file.h> if KERNEL is defined. Fixed everything that depended on getting fcntl.h stuff from the wrong place. Most things don't depend on file.h stuff at all.
1997-03-23 03:37:54 +00:00
#include <sys/fcntl.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/file.h>
#include <sys/proc.h>
All of this is cosmetic. prototypes, #includes, printfs and so on. Makes GCC a lot more silent.
1994-10-02 17:35:40 +00:00
#include <sys/signalvar.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#include <sys/socketvar.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
#include <sys/poll.h>
The code I picked up from NetBSD in '97 had a nasty bug. It limited the index of the pollfd array to the number of fd's currently open, not the maximum number of fd's. ie: if you had 0,1,2 open, you could not use pollfd slots higher than 20. The specs say we only have to support OPEN_MAX [64] entries but we allow way more than that.
2001-02-07 23:28:01 +00:00
#include <sys/resourcevar.h>
select() DKI is now in <sys/selinfo.h>.
2001-01-09 04:33:49 +00:00
#include <sys/selinfo.h>
Export the nselcoll counter via the kern.nselcoll sysctl so we can see just how bad it gets in various situations. Reminded by: adrian
2000-01-05 19:40:17 +00:00
#include <sys/sysctl.h>
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
#include <sys/sysent.h>
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
#include <sys/bio.h>
#include <sys/buf.h>
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
#include <sys/condvar.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#ifdef KTRACE
#include <sys/ktrace.h>
#endif
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
#include <vm/vm.h>
#include <vm/vm_page.h>
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
#include <machine/limits.h>
Last major round (Unless Bruce thinks of somthing :-) of malloc changes. Distribute all but the most fundamental malloc types. This time I also remembered the trick to making things static: Put "static" in front of them. A couple of finer points by: bde
1997-10-12 20:26:33 +00:00
static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
MALLOC_DEFINE(M_IOV, "iov", "large iov's");
Distribute and statizice a lot of the malloc M_* types. Substantial input from: bde
1997-10-11 18:31:40 +00:00
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
static int pollscan __P((struct thread *, struct pollfd *, u_int));
static int selscan __P((struct thread *, fd_mask **, fd_mask **, int));
static int dofileread __P((struct thread *, struct file *, int, void *,
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
size_t, off_t, int));
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
static int dofilewrite __P((struct thread *, struct file *, int,
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
const void *, size_t, off_t, int));
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Read system call.
*/
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#ifndef _SYS_SYSPROTO_H_
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct read_args {
int fd;
Fixed bogotification of pseudocode for syscall args by rev.1.53 of syscalls.master.
1998-09-05 14:30:11 +00:00
void *buf;
size_t nbyte;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
};
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
read(td, uap)
struct thread *td;
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct read_args *uap;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct file *fp;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
int error;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_lock(&Giant);
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
if ((error = fget_read(td, uap->fd, &fp)) == 0) {
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = dofileread(td, fp, uap->fd, uap->buf,
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
uap->nbyte, (off_t)-1, 0);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
}
mtx_unlock(&Giant);
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
return(error);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
/*
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
* Pread system call
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
*/
#ifndef _SYS_SYSPROTO_H_
struct pread_args {
int fd;
void *buf;
size_t nbyte;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
int pad;
off_t offset;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
};
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
pread(td, uap)
struct thread *td;
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct pread_args *uap;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
{
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct file *fp;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
int error;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
make pread use fget_read instead of holdfp.
2002-01-23 08:22:59 +00:00
if ((error = fget_read(td, uap->fd, &fp)) != 0)
return (error);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_lock(&Giant);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
if (fp->f_type != DTYPE_VNODE) {
error = ESPIPE;
} else {
error = dofileread(td, fp, uap->fd, uap->buf, uap->nbyte,
uap->offset, FOF_OFFSET);
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
fdrop(fp, td);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_unlock(&Giant);
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
return(error);
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
}
/*
* Code common for read and pread
*/
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
dofileread(td, fp, fd, buf, nbyte, offset, flags)
struct thread *td;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
struct file *fp;
int fd, flags;
void *buf;
size_t nbyte;
off_t offset;
{
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
struct uio auio;
struct iovec aiov;
long cnt, error = 0;
#ifdef KTRACE
struct iovec ktriov;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
struct uio ktruio;
Distinguish between whether ktraceing was enabled before an IO operation or after it. If the ktrace operation was enabled while the process was blocked doing IO, the race would allow it to pass down invalid (uninitialized) data and panic later down the call stack.
2000-07-27 03:45:18 +00:00
int didktr = 0;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#endif
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
aiov.iov_base = (caddr_t)buf;
aiov.iov_len = nbyte;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
auio.uio_offset = offset;
if (nbyte > INT_MAX)
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
return (EINVAL);
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
auio.uio_resid = nbyte;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
auio.uio_td = td;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (KTRPOINT(td->td_proc, KTR_GENIO)) {
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
ktriov = aiov;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
ktruio = auio;
Distinguish between whether ktraceing was enabled before an IO operation or after it. If the ktrace operation was enabled while the process was blocked doing IO, the race would allow it to pass down invalid (uninitialized) data and panic later down the call stack.
2000-07-27 03:45:18 +00:00
didktr = 1;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#endif
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
cnt = nbyte;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((error = fo_read(fp, &auio, fp->f_cred, flags, td))) {
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
cnt -= auio.uio_resid;
#ifdef KTRACE
Distinguish between whether ktraceing was enabled before an IO operation or after it. If the ktrace operation was enabled while the process was blocked doing IO, the race would allow it to pass down invalid (uninitialized) data and panic later down the call stack.
2000-07-27 03:45:18 +00:00
if (didktr && error == 0) {
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
ktruio.uio_iov = &ktriov;
ktruio.uio_resid = cnt;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
ktrgenio(td->td_proc->p_tracep, fd, UIO_READ, &ktruio, error);
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#endif
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_retval[0] = cnt;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
return (error);
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Scatter read system call.
*/
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#ifndef _SYS_SYSPROTO_H_
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct readv_args {
Fixed the type of readv(). An args struct member name conflicted with the machine-generated one in <sys/sysproto.h>.
1995-11-11 06:57:34 +00:00
int fd;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct iovec *iovp;
u_int iovcnt;
};
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
readv(td, uap)
struct thread *td;
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct readv_args *uap;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct file *fp;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct uio auio;
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct iovec *iov;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct iovec *needfree;
struct iovec aiov[UIO_SMALLIOV];
long i, cnt, error = 0;
u_int iovlen;
#ifdef KTRACE
struct iovec *ktriov = NULL;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
struct uio ktruio;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_lock(&Giant);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
if ((error = fget_read(td, uap->fd, &fp)) != 0)
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
goto done2;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/* note: can't use iovlen until iovcnt is validated */
iovlen = uap->iovcnt * sizeof (struct iovec);
if (uap->iovcnt > UIO_SMALLIOV) {
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
if (uap->iovcnt > UIO_MAXIOV) {
error = EINVAL;
goto done2;
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else {
iov = aiov;
needfree = NULL;
}
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovcnt;
auio.uio_rw = UIO_READ;
auio.uio_segflg = UIO_USERSPACE;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
auio.uio_td = td;
Modifications to existing files to support the initial AIO/LIO and kernel based threading support.
1997-06-16 00:29:36 +00:00
auio.uio_offset = -1;
While in the real world, I had a bad case of being swapped out for a lot of cycles. While waiting there I added a lot of the extra ()'s I have, (I have never used LISP to any extent). So I compiled the kernel with -Wall and shut up a lot of "suggest you add ()'s", removed a bunch of unused var's and added a couple of declarations here and there. Having a lap-top is highly recommended. My kernel still runs, yell at me if you kernel breaks.
1994-09-25 19:34:02 +00:00
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
goto done;
auio.uio_resid = 0;
for (i = 0; i < uap->iovcnt; i++) {
Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
if (iov->iov_len > INT_MAX - auio.uio_resid) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
error = EINVAL;
goto done;
}
Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
auio.uio_resid += iov->iov_len;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
iov++;
}
#ifdef KTRACE
/*
* if tracing, save a copy of iovec
*/
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (KTRPOINT(td->td_proc, KTR_GENIO)) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
ktruio = auio;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
#endif
cnt = auio.uio_resid;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((error = fo_read(fp, &auio, fp->f_cred, 0, td))) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
cnt -= auio.uio_resid;
#ifdef KTRACE
if (ktriov != NULL) {
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
if (error == 0) {
ktruio.uio_iov = ktriov;
ktruio.uio_resid = cnt;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
ktrgenio(td->td_proc->p_tracep, uap->fd, UIO_READ, &ktruio,
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
error);
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
FREE(ktriov, M_TEMP);
}
#endif
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_retval[0] = cnt;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
done:
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (needfree)
FREE(needfree, M_IOV);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
done2:
mtx_unlock(&Giant);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (error);
}
/*
* Write system call
*/
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#ifndef _SYS_SYSPROTO_H_
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct write_args {
int fd;
Fixed bogotification of pseudocode for syscall args by rev.1.53 of syscalls.master.
1998-09-05 14:30:11 +00:00
const void *buf;
size_t nbyte;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
};
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
write(td, uap)
struct thread *td;
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct write_args *uap;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct file *fp;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
int error;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_lock(&Giant);
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
if ((error = fget_write(td, uap->fd, &fp)) == 0) {
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = dofilewrite(td, fp, uap->fd, uap->buf, uap->nbyte,
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
(off_t)-1, 0);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
} else {
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
error = EBADF; /* XXX this can't be right */
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
}
mtx_unlock(&Giant);
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
return(error);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
/*
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
* Pwrite system call
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
*/
#ifndef _SYS_SYSPROTO_H_
struct pwrite_args {
int fd;
const void *buf;
size_t nbyte;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
int pad;
off_t offset;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
};
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
pwrite(td, uap)
struct thread *td;
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct pwrite_args *uap;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
{
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct file *fp;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
int error;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
if ((error = fget_write(td, uap->fd, &fp)) == 0) {
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_lock(&Giant);
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
if (fp->f_type == DTYPE_VNODE) {
error = dofilewrite(td, fp, uap->fd, uap->buf,
uap->nbyte, uap->offset, FOF_OFFSET);
} else {
error = ESPIPE;
}
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_unlock(&Giant);
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
} else {
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
error = EBADF; /* this can't be right */
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
return(error);
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
}
static int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
dofilewrite(td, fp, fd, buf, nbyte, offset, flags)
struct thread *td;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
struct file *fp;
int fd, flags;
const void *buf;
size_t nbyte;
off_t offset;
{
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
struct uio auio;
struct iovec aiov;
long cnt, error = 0;
#ifdef KTRACE
struct iovec ktriov;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
struct uio ktruio;
Distinguish between whether ktraceing was enabled before an IO operation or after it. If the ktrace operation was enabled while the process was blocked doing IO, the race would allow it to pass down invalid (uninitialized) data and panic later down the call stack.
2000-07-27 03:45:18 +00:00
int didktr = 0;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#endif
Fix a warning that has been annoying me for some time: "kern/sys_generic.c:358: warning: cast discards qualifiers from pointer target type" The idea for using the uintptr_t intermediate cast for de-constifying a pointer was hinted at by bde some time ago.
2000-07-28 22:17:42 +00:00
aiov.iov_base = (void *)(uintptr_t)buf;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
aiov.iov_len = nbyte;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
auio.uio_offset = offset;
if (nbyte > INT_MAX)
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
return (EINVAL);
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
auio.uio_resid = nbyte;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
auio.uio_td = td;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#ifdef KTRACE
/*
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
* if tracing, save a copy of iovec and uio
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
*/
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (KTRPOINT(td->td_proc, KTR_GENIO)) {
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
ktriov = aiov;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
ktruio = auio;
Distinguish between whether ktraceing was enabled before an IO operation or after it. If the ktrace operation was enabled while the process was blocked doing IO, the race would allow it to pass down invalid (uninitialized) data and panic later down the call stack.
2000-07-27 03:45:18 +00:00
didktr = 1;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#endif
Add standard padding argument to pread and pwrite syscall. That should make them NetBSD compatible. Add parameter to fo_read and fo_write. (The only flag FOF_OFFSET mean that the offset is set in the struct uio). Factor out some common code from read/pread/write/pwrite syscalls.
1999-04-04 21:41:28 +00:00
cnt = nbyte;
only call bwillwrite() to stall on IO when dealing with VNODEs otherwise we will stall on non-disk IO for things like fifos and sockets
2000-11-30 20:23:14 +00:00
if (fp->f_type == DTYPE_VNODE)
bwillwrite();
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((error = fo_write(fp, &auio, fp->f_cred, flags, td))) {
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
Grab the process lock while calling psignal and before calling psignal.
2001-03-07 03:37:06 +00:00
if (error == EPIPE) {
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_LOCK(td->td_proc);
psignal(td->td_proc, SIGPIPE);
PROC_UNLOCK(td->td_proc);
Grab the process lock while calling psignal and before calling psignal.
2001-03-07 03:37:06 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
}
cnt -= auio.uio_resid;
#ifdef KTRACE
Distinguish between whether ktraceing was enabled before an IO operation or after it. If the ktrace operation was enabled while the process was blocked doing IO, the race would allow it to pass down invalid (uninitialized) data and panic later down the call stack.
2000-07-27 03:45:18 +00:00
if (didktr && error == 0) {
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
ktruio.uio_iov = &ktriov;
ktruio.uio_resid = cnt;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
ktrgenio(td->td_proc->p_tracep, fd, UIO_WRITE, &ktruio, error);
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
}
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
#endif
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_retval[0] = cnt;
Added pread and pwrite. These functions are defined by the X/Open Threads Extension. (Note: We use the same syscall numbers as NetBSD.) Submitted by: John Plevyak <jplevyak@inktomi.com>
1999-03-27 21:16:58 +00:00
return (error);
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Gather write system call
*/
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#ifndef _SYS_SYSPROTO_H_
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct writev_args {
int fd;
struct iovec *iovp;
u_int iovcnt;
};
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
writev(td, uap)
struct thread *td;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
register struct writev_args *uap;
{
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
struct file *fp;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct uio auio;
register struct iovec *iov;
struct iovec *needfree;
struct iovec aiov[UIO_SMALLIOV];
long i, cnt, error = 0;
u_int iovlen;
#ifdef KTRACE
struct iovec *ktriov = NULL;
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
struct uio ktruio;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_lock(&Giant);
remove holdfp() Replace uses of holdfp() with fget*() or fgetvp*() calls as appropriate introduce fget(), fget_read(), fget_write() - these functions will take a thread and file descriptor and return a file pointer with its ref count bumped. introduce fgetvp(), fgetvp_read(), fgetvp_write() - these functions will take a thread and file descriptor and return a vref()'d vnode. *_read() requires that the file pointer be FREAD, *_write that it be FWRITE. This continues the cleanup of struct filedesc and struct file access routines which, when are all through with it, will allow us to then make the API calls MP safe and be able to move Giant down into the fo_* functions.
2001-11-14 06:30:36 +00:00
if ((error = fget_write(td, uap->fd, &fp)) != 0) {
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
error = EBADF;
goto done2;
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/* note: can't use iovlen until iovcnt is validated */
iovlen = uap->iovcnt * sizeof (struct iovec);
if (uap->iovcnt > UIO_SMALLIOV) {
Fix a race condition with shared fd tables and writev(). It's still not safe to consider file table sharing secure. Submitted by: Ville-Pertti Keinonen <will@iki.fi>
1999-10-14 05:37:52 +00:00
if (uap->iovcnt > UIO_MAXIOV) {
needfree = NULL;
error = EINVAL;
goto done;
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK);
needfree = iov;
} else {
iov = aiov;
needfree = NULL;
}
auio.uio_iov = iov;
auio.uio_iovcnt = uap->iovcnt;
auio.uio_rw = UIO_WRITE;
auio.uio_segflg = UIO_USERSPACE;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
auio.uio_td = td;
Modifications to existing files to support the initial AIO/LIO and kernel based threading support.
1997-06-16 00:29:36 +00:00
auio.uio_offset = -1;
While in the real world, I had a bad case of being swapped out for a lot of cycles. While waiting there I added a lot of the extra ()'s I have, (I have never used LISP to any extent). So I compiled the kernel with -Wall and shut up a lot of "suggest you add ()'s", removed a bunch of unused var's and added a couple of declarations here and there. Having a lap-top is highly recommended. My kernel still runs, yell at me if you kernel breaks.
1994-09-25 19:34:02 +00:00
if ((error = copyin((caddr_t)uap->iovp, (caddr_t)iov, iovlen)))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
goto done;
auio.uio_resid = 0;
for (i = 0; i < uap->iovcnt; i++) {
Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
if (iov->iov_len > INT_MAX - auio.uio_resid) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
error = EINVAL;
goto done;
}
Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
auio.uio_resid += iov->iov_len;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
iov++;
}
#ifdef KTRACE
/*
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
* if tracing, save a copy of iovec and uio
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
*/
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (KTRPOINT(td->td_proc, KTR_GENIO)) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK);
bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen);
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
ktruio = auio;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
#endif
cnt = auio.uio_resid;
Only call bwillwrite() for vnodes. Do not penalize devices or pipes.
2000-12-07 23:45:57 +00:00
if (fp->f_type == DTYPE_VNODE)
bwillwrite();
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((error = fo_write(fp, &auio, fp->f_cred, 0, td))) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (auio.uio_resid != cnt && (error == ERESTART ||
error == EINTR || error == EWOULDBLOCK))
error = 0;
Grab the process lock while calling psignal and before calling psignal.
2001-03-07 03:37:06 +00:00
if (error == EPIPE) {
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_LOCK(td->td_proc);
psignal(td->td_proc, SIGPIPE);
PROC_UNLOCK(td->td_proc);
Grab the process lock while calling psignal and before calling psignal.
2001-03-07 03:37:06 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
cnt -= auio.uio_resid;
#ifdef KTRACE
if (ktriov != NULL) {
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
if (error == 0) {
ktruio.uio_iov = ktriov;
ktruio.uio_resid = cnt;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
ktrgenio(td->td_proc->p_tracep, uap->fd, UIO_WRITE, &ktruio,
Modify ktrace's general I/O tracing, ktrgenio(), to use a struct uio * instead of a struct iovec * array and int len. Get rid of stupidly trying to allocate all of the memory and copyin()ing the entire iovec[], and instead just do the proper VOP_WRITE() in ktrwrite() using a copy of the struct uio that the syscall originally used. This solves the DoS which could easily be performed; to work around the DoS, one could also remove "options KTRACE" from the kernel. This is a very strong MFC candidate for 4.1. Found by: art@OpenBSD.org
2000-07-02 08:08:09 +00:00
error);
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
FREE(ktriov, M_TEMP);
}
#endif
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_retval[0] = cnt;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
done:
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (needfree)
FREE(needfree, M_IOV);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
done2:
mtx_unlock(&Giant);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (error);
}
/*
* Ioctl system call
*/
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#ifndef _SYS_SYSPROTO_H_
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct ioctl_args {
int fd;
Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans <bde@zeta.org.au>
1998-08-24 08:39:39 +00:00
u_long com;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
caddr_t data;
};
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/* ARGSUSED */
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
ioctl(td, uap)
struct thread *td;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
register struct ioctl_args *uap;
{
Replace ffind_* with fget calls. Make fget MPsafe. Make fgetvp and fgetsock use the fget subsystem to reduce code bloat. Push giant down in fpathconf().
2002-01-14 00:13:45 +00:00
struct file *fp;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
register struct filedesc *fdp;
64bit fixes: use u_long not int for ioctl command.
1998-06-10 10:29:31 +00:00
register u_long com;
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
int error = 0;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
register u_int size;
caddr_t data, memp;
int tmp;
#define STK_PARAMS 128
Some ioctl routines assume that the ioctl buffer is aligned, but a char[] declaration makes no such guarentee. A union is used to force alignment of the char buffer.
2000-05-09 17:43:21 +00:00
union {
char stkbuf[STK_PARAMS];
long align;
} ubuf;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Replace ffind_* with fget calls. Make fget MPsafe. Make fgetvp and fgetsock use the fget subsystem to reduce code bloat. Push giant down in fpathconf().
2002-01-14 00:13:45 +00:00
if ((error = fget(td, uap->fd, &fp)) != 0)
return (error);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_lock(&Giant);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
fdrop(fp, td);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_unlock(&Giant);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
return (EBADF);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
}
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
fdp = td->td_proc->p_fd;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
switch (com = uap->com) {
case FIONCLEX:
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILEDESC_LOCK(fdp);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
fdp->fd_ofileflags[uap->fd] &= ~UF_EXCLOSE;
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_unlock(&Giant);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
return (0);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
case FIOCLEX:
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILEDESC_LOCK(fdp);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
fdp->fd_ofileflags[uap->fd] |= UF_EXCLOSE;
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILEDESC_UNLOCK(fdp);
fdrop(fp, td);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_unlock(&Giant);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
return (0);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
/*
* Interpret high order word to find amount of data to be
* copied to/from the user's address space.
*/
size = IOCPARM_LEN(com);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
if (size > IOCPARM_MAX) {
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
fdrop(fp, td);
undo a bit of the Giant pushdown. fdrop isn't SMP safe as it may call into the file's close routine which definetly is not SMP safe right now, so we hold Giant over calls to fdrop now.
2002-01-19 01:03:54 +00:00
mtx_unlock(&Giant);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
return (ENOTTY);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
}
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
memp = NULL;
Some ioctl routines assume that the ioctl buffer is aligned, but a char[] declaration makes no such guarentee. A union is used to force alignment of the char buffer.
2000-05-09 17:43:21 +00:00
if (size > sizeof (ubuf.stkbuf)) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
memp = (caddr_t)malloc((u_long)size, M_IOCTLOPS, M_WAITOK);
data = memp;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
} else {
Some ioctl routines assume that the ioctl buffer is aligned, but a char[] declaration makes no such guarentee. A union is used to force alignment of the char buffer.
2000-05-09 17:43:21 +00:00
data = ubuf.stkbuf;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (com&IOC_IN) {
if (size) {
error = copyin(uap->data, data, (u_int)size);
if (error) {
if (memp)
free(memp, M_IOCTLOPS);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
goto done;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
} else {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
*(caddr_t *)data = uap->data;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
} else if ((com&IOC_OUT) && size) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Zero the buffer so the user always
* gets back something deterministic.
*/
bzero(data, size);
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
} else if (com&IOC_VOID) {
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
*(caddr_t *)data = uap->data;
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
switch (com) {
case FIONBIO:
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILE_LOCK(fp);
While in the real world, I had a bad case of being swapped out for a lot of cycles. While waiting there I added a lot of the extra ()'s I have, (I have never used LISP to any extent). So I compiled the kernel with -Wall and shut up a lot of "suggest you add ()'s", removed a bunch of unused var's and added a couple of declarations here and there. Having a lap-top is highly recommended. My kernel still runs, yell at me if you kernel breaks.
1994-09-25 19:34:02 +00:00
if ((tmp = *(int *)data))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
fp->f_flag |= FNONBLOCK;
else
fp->f_flag &= ~FNONBLOCK;
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILE_UNLOCK(fp);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = fo_ioctl(fp, FIONBIO, (caddr_t)&tmp, td);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
break;
case FIOASYNC:
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILE_LOCK(fp);
While in the real world, I had a bad case of being swapped out for a lot of cycles. While waiting there I added a lot of the extra ()'s I have, (I have never used LISP to any extent). So I compiled the kernel with -Wall and shut up a lot of "suggest you add ()'s", removed a bunch of unused var's and added a couple of declarations here and there. Having a lap-top is highly recommended. My kernel still runs, yell at me if you kernel breaks.
1994-09-25 19:34:02 +00:00
if ((tmp = *(int *)data))
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
fp->f_flag |= FASYNC;
else
fp->f_flag &= ~FASYNC;
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILE_UNLOCK(fp);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = fo_ioctl(fp, FIOASYNC, (caddr_t)&tmp, td);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
break;
default:
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = fo_ioctl(fp, com, data, td);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Copy any data to user, size was
* already set and checked above.
*/
if (error == 0 && (com&IOC_OUT) && size)
error = copyout(data, uap->data, (u_int)size);
break;
}
if (memp)
free(memp, M_IOCTLOPS);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fdrop(fp, td);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
done:
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_unlock(&Giant);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (error);
}
Export the nselcoll counter via the kern.nselcoll sysctl so we can see just how bad it gets in various situations. Reminded by: adrian
2000-01-05 19:40:17 +00:00
static int nselcoll; /* Select collisions since boot */
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
struct cv selwait;
Export the nselcoll counter via the kern.nselcoll sysctl so we can see just how bad it gets in various situations. Reminded by: adrian
2000-01-05 19:40:17 +00:00
SYSCTL_INT(_kern, OID_AUTO, nselcoll, CTLFLAG_RD, &nselcoll, 0, "");
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Select system call.
*/
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#ifndef _SYS_SYSPROTO_H_
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct select_args {
Remove the kernel FD_SETSIZE limit for select(). Make select()'s first argument 'int' not 'u_int'. Reviewed by: bde
1996-08-20 07:18:10 +00:00
int nd;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
fd_set *in, *ou, *ex;
struct timeval *tv;
};
Included <sys/sysproto.h> to get central declarations for syscall args structs and prototypes for syscalls. Ifdefed duplicated decentralized declarations of args structs. It's convenient to have this visible but they are hard to maintain. Some are already different from the central declarations. 4.4lite2 puts them in comments in the function headers but I wanted to avoid the large changes for that.
1995-11-12 06:43:28 +00:00
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
select(td, uap)
register struct thread *td;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
register struct select_args *uap;
{
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
struct filedesc *fdp;
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
/*
* The magic 2048 here is chosen to be just enough for FD_SETSIZE
* infds with the new FD_SETSIZE of 1024, and more than enough for
* FD_SETSIZE infds, outfds and exceptfds with the old FD_SETSIZE
* of 256.
*/
fd_mask s_selbits[howmany(2048, NFDBITS)];
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
fd_mask *ibits[3], *obits[3], *selbits, *sbp;
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
struct timeval atv, rtv, ttv;
Remove unused variables in select(2) from previous delta. Pointed out by: bde
2002-01-30 19:48:25 +00:00
int ncoll, error, timo;
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
u_int nbufbytes, ncpbytes, nfdbits;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Remove the kernel FD_SETSIZE limit for select(). Make select()'s first argument 'int' not 'u_int'. Reviewed by: bde
1996-08-20 07:18:10 +00:00
if (uap->nd < 0)
Fix a minor style error in my code.
1996-08-20 15:03:41 +00:00
return (EINVAL);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
fdp = td->td_proc->p_fd;
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_lock(&Giant);
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILEDESC_LOCK(fdp);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (uap->nd > td->td_proc->p_fd->fd_nfiles)
uap->nd = td->td_proc->p_fd->fd_nfiles; /* forgiving; slightly wrong */
SMP Lock struct file, filedesc and the global file list. Seigo Tanimura (tanimura) posted the initial delta. I've polished it quite a bit reducing the need for locking and adapting it for KSE. Locks: 1 mutex in each filedesc protects all the fields. protects "struct file" initialization, while a struct file is being changed from &badfileops -> &pipeops or something the filedesc should be locked. 1 mutex in each struct file protects the refcount fields. doesn't protect anything else. the flags used for garbage collection have been moved to f_gcflag which was the FILLER short, this doesn't need locking because the garbage collection is a single threaded container. could likely be made to use a pool mutex. 1 sx lock for the global filelist. struct file * fhold(struct file *fp); /* increments reference count on a file */ struct file * fhold_locked(struct file *fp); /* like fhold but expects file to locked */ struct file * ffind_hold(struct thread *, int fd); /* finds the struct file in thread, adds one reference and returns it unlocked */ struct file * ffind_lock(struct thread *, int fd); /* ffind_hold, but returns file locked */ I still have to smp-safe the fget cruft, I'll get to that asap.
2002-01-13 11:58:06 +00:00
FILEDESC_UNLOCK(fdp);
Remove the kernel FD_SETSIZE limit for select(). Make select()'s first argument 'int' not 'u_int'. Reviewed by: bde
1996-08-20 07:18:10 +00:00
/*
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
* Allocate just enough bits for the non-null fd_sets. Use the
* preallocated auto buffer if possible.
Remove the kernel FD_SETSIZE limit for select(). Make select()'s first argument 'int' not 'u_int'. Reviewed by: bde
1996-08-20 07:18:10 +00:00
*/
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
nfdbits = roundup(uap->nd, NFDBITS);
ncpbytes = nfdbits / NBBY;
nbufbytes = 0;
if (uap->in != NULL)
nbufbytes += 2 * ncpbytes;
if (uap->ou != NULL)
nbufbytes += 2 * ncpbytes;
if (uap->ex != NULL)
nbufbytes += 2 * ncpbytes;
if (nbufbytes <= sizeof s_selbits)
selbits = &s_selbits[0];
else
selbits = malloc(nbufbytes, M_SELECT, M_WAITOK);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
/*
* Assign pointers into the bit buffers and fetch the input bits.
* Put the output buffers together so that they can be bzeroed
* together.
*/
sbp = selbits;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
#define getbits(name, x) \
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
do { \
if (uap->name == NULL) \
ibits[x] = NULL; \
else { \
ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp; \
obits[x] = sbp; \
sbp += ncpbytes / sizeof *sbp; \
error = copyin(uap->name, ibits[x], ncpbytes); \
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
if (error != 0) \
goto done_noproclock; \
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
} \
} while (0)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
getbits(in, 0);
getbits(ou, 1);
getbits(ex, 2);
#undef getbits
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
if (nbufbytes != 0)
bzero(selbits, nbufbytes / 2);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (uap->tv) {
error = copyin((caddr_t)uap->tv, (caddr_t)&atv,
sizeof (atv));
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
if (error)
goto done_noproclock;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (itimerfix(&atv)) {
error = EINVAL;
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
goto done_noproclock;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
s/nanoruntime/nanouptime/g s/microruntime/microuptime/g Reviewed by: bde
1998-05-17 11:53:46 +00:00
getmicrouptime(&rtv);
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
timevaladd(&atv, &rtv);
For infinite timeouts, set both the tv_sec and tv_usec fields to zero in poll() and select(). Noticed by: Wesley Morgan <morganw@chemicals.tacorp.com>
2000-07-13 02:12:25 +00:00
} else {
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
atv.tv_sec = 0;
For infinite timeouts, set both the tv_sec and tv_usec fields to zero in poll() and select(). Noticed by: Wesley Morgan <morganw@chemicals.tacorp.com>
2000-07-13 02:12:25 +00:00
atv.tv_usec = 0;
}
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
timo = 0;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_LOCK(td->td_proc);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
retry:
ncoll = nselcoll;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags |= TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(td->td_proc);
error = selscan(td, ibits, obits, uap->nd);
PROC_LOCK(td->td_proc);
if (error || td->td_retval[0])
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
goto done;
Fix a very obscure bug in select() and poll() where the timeout would never expire if poll() or select() was called before the system had been in multiuser for 1 second. This was caused by only checking to see if tv_sec was zero rather than checking both tv_sec and tv_usec.
2000-07-12 22:46:40 +00:00
if (atv.tv_sec || atv.tv_usec) {
s/nanoruntime/nanouptime/g s/microruntime/microuptime/g Reviewed by: bde
1998-05-17 11:53:46 +00:00
getmicrouptime(&rtv);
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
if (timevalcmp(&rtv, &atv, >=)) {
/*
* An event of our interest may occur during locking a process.
* In order to avoid missing the event that occured during locking
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
* the process, test TDF_SELECT and rescan file descriptors if
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
* necessary.
*/
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((td->td_flags & TDF_SELECT) == 0 || nselcoll != ncoll) {
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
ncoll = nselcoll;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags |= TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(td->td_proc);
error = selscan(td, ibits, obits, uap->nd);
PROC_LOCK(td->td_proc);
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
} else
mtx_unlock_spin(&sched_lock);
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
goto done;
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
}
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
ttv = atv;
timevalsub(&ttv, &rtv);
timo = ttv.tv_sec > 24 * 60 * 60 ?
24 * 60 * 60 * hz : tvtohz(&ttv);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags &= ~TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
Add aio_waitcomplete(). Make aio work correctly for socket descriptors. Make gratuitous style(9) fixes (me, not the submitter) to make the aio code more readable. PR: kern/12053 Submitted by: Chris Sedore <cmsedore@maxwell.syr.edu>
2000-01-14 02:53:29 +00:00
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
if (timo > 0)
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = cv_timedwait_sig(&selwait, &td->td_proc->p_mtx, timo);
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
else
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = cv_wait_sig(&selwait, &td->td_proc->p_mtx);
Add aio_waitcomplete(). Make aio work correctly for socket descriptors. Make gratuitous style(9) fixes (me, not the submitter) to make the aio code more readable. PR: kern/12053 Submitted by: Chris Sedore <cmsedore@maxwell.syr.edu>
2000-01-14 02:53:29 +00:00
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (error == 0)
goto retry;
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
done:
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags &= ~TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(td->td_proc);
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
done_noproclock:
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/* select is not restarted after signals... */
if (error == ERESTART)
error = EINTR;
if (error == EWOULDBLOCK)
error = 0;
#define putbits(name, x) \
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
if (uap->name && (error2 = copyout(obits[x], uap->name, ncpbytes))) \
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
error = error2;
if (error == 0) {
int error2;
putbits(in, 0);
putbits(ou, 1);
putbits(ex, 2);
#undef putbits
}
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
if (selbits != &s_selbits[0])
free(selbits, M_SELECT);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_unlock(&Giant);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (error);
}
A Major staticize sweep. Generates a couple of warnings that I'll deal with later. A number of unused vars removed. A number of unused procs removed or #ifdefed.
1995-12-14 08:32:45 +00:00
static int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
selscan(td, ibits, obits, nfd)
struct thread *td;
Remove the kernel FD_SETSIZE limit for select(). Make select()'s first argument 'int' not 'u_int'. Reviewed by: bde
1996-08-20 07:18:10 +00:00
fd_mask **ibits, **obits;
Move the "retval" (3rd) parameter from all syscall functions and put it in struct proc instead. This fixes a boatload of compiler warning, and removes a lot of cruft from the sources. I have not removed the /*ARGSUSED*/, they will require some looking at. libkvm, ps and other userland struct proc frobbing programs will need recompiled.
1997-11-06 19:29:57 +00:00
int nfd;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Fix select(2) for the Alpha. (!!) It was never returning true for fd's in the range of 32-63, 96-127 etc. The first problem was the FD_*() macros were shifting a 32 bit integer "1" left by more than 32 bits. The same problem happened in selscan(). ffs() also takes an int argument and causes failure. For cases where int == long (ie: the usual case for x86, but not always as gcc can have long being a 64 bit quantity) ffs() could be used. Reported by: Marian Stagarescu <marian@bile.skycache.com> Reviewed by: dfr, gallatin (sys/types.h only) Approved by: jkh
2000-02-20 13:36:26 +00:00
int msk, i, fd;
fd_mask bits;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct file *fp;
int n = 0;
Fixed some style bugs in the poll() code. Removed dead code to "Avoid inadvertently sleeping forever". hzto() never returns 0.
1997-11-23 10:30:50 +00:00
/* Note: backend also returns POLLHUP/POLLERR if appropriate. */
static int flag[3] = { POLLRDNORM, POLLWRNORM, POLLRDBAND };
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
struct filedesc *fdp = td->td_proc->p_fd;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
FILEDESC_LOCK(fdp);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
for (msk = 0; msk < 3; msk++) {
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
if (ibits[msk] == NULL)
continue;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
for (i = 0; i < nfd; i += NFDBITS) {
Remove the kernel FD_SETSIZE limit for select(). Make select()'s first argument 'int' not 'u_int'. Reviewed by: bde
1996-08-20 07:18:10 +00:00
bits = ibits[msk][i/NFDBITS];
Fix select(2) for the Alpha. (!!) It was never returning true for fd's in the range of 32-63, 96-127 etc. The first problem was the FD_*() macros were shifting a 32 bit integer "1" left by more than 32 bits. The same problem happened in selscan(). ffs() also takes an int argument and causes failure. For cases where int == long (ie: the usual case for x86, but not always as gcc can have long being a 64 bit quantity) ffs() could be used. Reported by: Marian Stagarescu <marian@bile.skycache.com> Reviewed by: dfr, gallatin (sys/types.h only) Approved by: jkh
2000-02-20 13:36:26 +00:00
/* ffs(int mask) not portable, fd_mask is long */
for (fd = i; bits && fd < nfd; fd++, bits >>= 1) {
if (!(bits & 1))
continue;
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
if ((fp = fget_locked(fdp, fd)) == NULL) {
FILEDESC_UNLOCK(fdp);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (EBADF);
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
}
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (fo_poll(fp, flag[msk], fp->f_cred, td)) {
Improved select(): - avoid malloc() if the number of fds is small. - pack the bits better so that `small' is quite large. - don't waste time generating zero bits for null fd_set pointers or scanning these bits. Possibly improved select(): - free malloc()ed storage before returning. This is simpler and I think huge select()s aren't worth optimizing since they are rare, relative gain would be small and there would be tiny costs for all selects(). Reviewed by: ache (first version by him too)
1997-02-20 11:51:52 +00:00
obits[msk][(fd)/NFDBITS] |=
Fix select(2) for the Alpha. (!!) It was never returning true for fd's in the range of 32-63, 96-127 etc. The first problem was the FD_*() macros were shifting a 32 bit integer "1" left by more than 32 bits. The same problem happened in selscan(). ffs() also takes an int argument and causes failure. For cases where int == long (ie: the usual case for x86, but not always as gcc can have long being a 64 bit quantity) ffs() could be used. Reported by: Marian Stagarescu <marian@bile.skycache.com> Reviewed by: dfr, gallatin (sys/types.h only) Approved by: jkh
2000-02-20 13:36:26 +00:00
((fd_mask)1 << ((fd) % NFDBITS));
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
n++;
}
}
}
}
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
FILEDESC_UNLOCK(fdp);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_retval[0] = n;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return (0);
}
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
/*
* Poll system call.
*/
#ifndef _SYS_SYSPROTO_H_
struct poll_args {
struct pollfd *fds;
u_int nfds;
int timeout;
};
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
poll(td, uap)
struct thread *td;
Correctly declare variables as u_int rather than doing typecasts. Kill some register declarations while I'm here. Submitted by: bde (1)
2001-02-27 15:11:31 +00:00
struct poll_args *uap;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
{
caddr_t bits;
char smallbits[32 * sizeof(struct pollfd)];
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
struct timeval atv, rtv, ttv;
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
int ncoll, error = 0, timo;
Correctly declare variables as u_int rather than doing typecasts. Kill some register declarations while I'm here. Submitted by: bde (1)
2001-02-27 15:11:31 +00:00
u_int nfds;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
size_t ni;
The code I picked up from NetBSD in '97 had a nasty bug. It limited the index of the pollfd array to the number of fd's currently open, not the maximum number of fd's. ie: if you had 0,1,2 open, you could not use pollfd slots higher than 20. The specs say we only have to support OPEN_MAX [64] entries but we allow way more than that.
2001-02-07 23:28:01 +00:00
nfds = SCARG(uap, nfds);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
mtx_lock(&Giant);
The code I picked up from NetBSD in '97 had a nasty bug. It limited the index of the pollfd array to the number of fd's currently open, not the maximum number of fd's. ie: if you had 0,1,2 open, you could not use pollfd slots higher than 20. The specs say we only have to support OPEN_MAX [64] entries but we allow way more than that.
2001-02-07 23:28:01 +00:00
/*
poll(2) array limits (take 2) - after some input from bde.
2001-02-09 08:10:22 +00:00
* This is kinda bogus. We have fd limits, but that is not
* really related to the size of the pollfd array. Make sure
* we let the process use at least FD_SETSIZE entries and at
* least enough for the current limits. We want to be reasonably
* safe, but not overly restrictive.
The code I picked up from NetBSD in '97 had a nasty bug. It limited the index of the pollfd array to the number of fd's currently open, not the maximum number of fd's. ie: if you had 0,1,2 open, you could not use pollfd slots higher than 20. The specs say we only have to support OPEN_MAX [64] entries but we allow way more than that.
2001-02-07 23:28:01 +00:00
*/
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((nfds > td->td_proc->p_rlimit[RLIMIT_NOFILE].rlim_cur) &&
(nfds > FD_SETSIZE)) {
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
error = EINVAL;
goto done2;
}
The code I picked up from NetBSD in '97 had a nasty bug. It limited the index of the pollfd array to the number of fd's currently open, not the maximum number of fd's. ie: if you had 0,1,2 open, you could not use pollfd slots higher than 20. The specs say we only have to support OPEN_MAX [64] entries but we allow way more than that.
2001-02-07 23:28:01 +00:00
ni = nfds * sizeof(struct pollfd);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
if (ni > sizeof(smallbits))
bits = malloc(ni, M_TEMP, M_WAITOK);
else
bits = smallbits;
error = copyin(SCARG(uap, fds), bits, ni);
if (error)
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
goto done_noproclock;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
if (SCARG(uap, timeout) != INFTIM) {
atv.tv_sec = SCARG(uap, timeout) / 1000;
atv.tv_usec = (SCARG(uap, timeout) % 1000) * 1000;
if (itimerfix(&atv)) {
error = EINVAL;
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
goto done_noproclock;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
}
s/nanoruntime/nanouptime/g s/microruntime/microuptime/g Reviewed by: bde
1998-05-17 11:53:46 +00:00
getmicrouptime(&rtv);
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
timevaladd(&atv, &rtv);
For infinite timeouts, set both the tv_sec and tv_usec fields to zero in poll() and select(). Noticed by: Wesley Morgan <morganw@chemicals.tacorp.com>
2000-07-13 02:12:25 +00:00
} else {
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
atv.tv_sec = 0;
For infinite timeouts, set both the tv_sec and tv_usec fields to zero in poll() and select(). Noticed by: Wesley Morgan <morganw@chemicals.tacorp.com>
2000-07-13 02:12:25 +00:00
atv.tv_usec = 0;
}
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
timo = 0;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_LOCK(td->td_proc);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
retry:
ncoll = nselcoll;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags |= TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(td->td_proc);
error = pollscan(td, (struct pollfd *)bits, nfds);
PROC_LOCK(td->td_proc);
if (error || td->td_retval[0])
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
goto done;
Fix a very obscure bug in select() and poll() where the timeout would never expire if poll() or select() was called before the system had been in multiuser for 1 second. This was caused by only checking to see if tv_sec was zero rather than checking both tv_sec and tv_usec.
2000-07-12 22:46:40 +00:00
if (atv.tv_sec || atv.tv_usec) {
s/nanoruntime/nanouptime/g s/microruntime/microuptime/g Reviewed by: bde
1998-05-17 11:53:46 +00:00
getmicrouptime(&rtv);
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
if (timevalcmp(&rtv, &atv, >=)) {
/*
* An event of our interest may occur during locking a process.
* In order to avoid missing the event that occured during locking
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
* the process, test TDF_SELECT and rescan file descriptors if
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
* necessary.
*/
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if ((td->td_flags & TDF_SELECT) == 0 || nselcoll != ncoll) {
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
ncoll = nselcoll;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags |= TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(td->td_proc);
error = pollscan(td, (struct pollfd *)bits, nfds);
PROC_LOCK(td->td_proc);
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
} else
mtx_unlock_spin(&sched_lock);
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
goto done;
Back out scanning file descriptors with holding a process lock. selrecord() requires allproc sx in pfind(), resulting in lock order reversal between allproc and a process lock.
2001-05-15 10:19:57 +00:00
}
Time changes mark 2: * Figure out UTC relative to boottime. Four new functions provide time relative to boottime. * move "runtime" into struct proc. This helps fix the calcru() problem in SMP. * kill mono_time. * add timespec{add|sub|cmp} macros to time.h. (XXX: These may change!) * nanosleep, select & poll takes long sleeps one day at a time Reviewed by: bde Tested by: ache and others
1998-04-04 13:26:20 +00:00
ttv = atv;
timevalsub(&ttv, &rtv);
timo = ttv.tv_sec > 24 * 60 * 60 ?
24 * 60 * 60 * hz : tvtohz(&ttv);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
}
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags &= ~TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
if (timo > 0)
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = cv_timedwait_sig(&selwait, &td->td_proc->p_mtx, timo);
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
else
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
error = cv_wait_sig(&selwait, &td->td_proc->p_mtx);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
if (error == 0)
goto retry;
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
done:
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags &= ~TDF_SELECT;
The P_SELECT flag was moved from p->p_flag to td->td_flags, but p_flag was locked by the proc lock and td_flags is locked by the sched_lock. The places that read, set, and cleared TDF_SELECT weren't updated, so they read and modified td_flags w/o holding the sched_lock, meaning that they could corrupt the per-thread flags field. As an immediate band-aid, grab sched_lock while reading and manipulating td_flags in relation to TDF_SELECT. This will probably be cleaned up some later on.
2001-09-21 22:06:22 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(td->td_proc);
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
done_noproclock:
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
/* poll is not restarted after signals... */
if (error == ERESTART)
error = EINTR;
if (error == EWOULDBLOCK)
error = 0;
if (error == 0) {
error = copyout(bits, SCARG(uap, fds), ni);
if (error)
goto out;
}
out:
if (ni > sizeof(smallbits))
free(bits, M_TEMP);
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
done2:
mtx_unlock(&Giant);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
return (error);
}
static int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
pollscan(td, fds, nfd)
struct thread *td;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
struct pollfd *fds;
Correctly declare variables as u_int rather than doing typecasts. Kill some register declarations while I'm here. Submitted by: bde (1)
2001-02-27 15:11:31 +00:00
u_int nfd;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
{
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
register struct filedesc *fdp = td->td_proc->p_fd;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
int i;
struct file *fp;
int n = 0;
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
FILEDESC_LOCK(fdp);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
for (i = 0; i < nfd; i++, fds++) {
poll(2) sets POLLNVAL for descriptors passed in that are less than 0. This makes it difficult to do efficient manipulation of the struct pollfd since you can't leave a slot empty. PR: 8599 Submitted-by: Marc Slemko <marcs@znep.com>
1998-12-10 01:53:26 +00:00
if (fds->fd >= fdp->fd_nfiles) {
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
fds->revents = POLLNVAL;
n++;
poll(2) sets POLLNVAL for descriptors passed in that are less than 0. This makes it difficult to do efficient manipulation of the struct pollfd since you can't leave a slot empty. PR: 8599 Submitted-by: Marc Slemko <marcs@znep.com>
1998-12-10 01:53:26 +00:00
} else if (fds->fd < 0) {
fds->revents = 0;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
} else {
fp = fdp->fd_ofiles[fds->fd];
This patchset fixes a large number of file descriptor race conditions. Pre-rfork code assumed inherent locking of a process's file descriptor array. However, with the advent of rfork() the file descriptor table could be shared between processes. This patch closes over a dozen serious race conditions related to one thread manipulating the table (e.g. closing or dup()ing a descriptor) while another is blocked in an open(), close(), fcntl(), read(), write(), etc... PR: kern/11629 Discussed with: Alexander Viro <viro@math.psu.edu>
2000-11-18 21:01:04 +00:00
if (fp == NULL) {
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
fds->revents = POLLNVAL;
n++;
} else {
Fixed some style bugs in the poll() code. Removed dead code to "Avoid inadvertently sleeping forever". hzto() never returns 0.
1997-11-23 10:30:50 +00:00
/*
* Note: backend also returns POLLHUP and
* POLLERR if appropriate.
*/
This is what was "fdfix2.patch," a fix for fd sharing. It's pretty far-reaching in fd-land, so you'll want to consult the code for changes. The biggest change is that now, you don't use fp->f_ops->fo_foo(fp, bar) but instead fo_foo(fp, bar), which increments and decrements the fp refcount upon entry and exit. Two new calls, fhold() and fdrop(), are provided. Each does what it seems like it should, and if fdrop() brings the refcount to zero, the fd is freed as well. Thanks to peter ("to hell with it, it looks ok to me.") for his review. Thanks to msmith for keeping me from putting locks everywhere :) Reviewed by: peter
1999-09-19 17:00:25 +00:00
fds->revents = fo_poll(fp, fds->events,
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
fp->f_cred, td);
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
if (fds->revents != 0)
n++;
}
}
}
Attempt to fixup select(2) and poll(2), this should fix some races with other threads as well as speed up the interfaces. To fix the race and accomplish the speedup, remove selholddrop and pollholddrop. The entire concept is somewhat bogus because holding the individual struct file pointers offers us no guarantees that another thread context won't close it on us thereby removing our access to our own reference. Selholddrop and pollholddrop also would do multiple locks and unlocks of mutexes _per-file_ in the fd arrays to be scanned, this needed to be sped up. Instead of using selholddrop and pollholddrop, simply hold the filedesc lock over the selscan and pollscan functions. This should protect us against close(2)'s on the files as reduce the multiple lock/unlock pairs per fd into a single lock over the filedesc.
2002-01-29 22:54:19 +00:00
FILEDESC_UNLOCK(fdp);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_retval[0] = n;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
return (0);
}
/*
* OpenBSD poll system call.
* XXX this isn't quite a true representation.. OpenBSD uses select ops.
*/
#ifndef _SYS_SYSPROTO_H_
struct openbsd_poll_args {
struct pollfd *fds;
u_int nfds;
int timeout;
};
#endif
Giant Pushdown: read() pread() readv() write () pwrite() writev() ioctl() select () poll() openbsd_poll()
2001-09-01 19:34:23 +00:00
/*
* MPSAFE
*/
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
openbsd_poll(td, uap)
register struct thread *td;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
register struct openbsd_poll_args *uap;
{
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
return (poll(td, (struct poll_args *)uap));
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*ARGSUSED*/
The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch. Reviewed by: Rodney W. Grimes Submitted by: John Dyson and David Greenman
1994-05-25 09:21:21 +00:00
int
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
seltrue(dev, events, td)
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
dev_t dev;
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
int events;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
struct thread *td;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
{
Implement poll(2). This is mostly taken from the NetBSD implementation (from some time ago) but with a few tweaks along the way. Obtained from: NetBSD
1997-09-14 02:30:32 +00:00
return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
static int
find_thread_in_proc(struct proc *p, struct thread *td)
{
struct thread *td2;
FOREACH_THREAD_IN_PROC(p, td2) {
if (td2 == td) {
return (1);
}
}
return (0);
}
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
/*
* Record a select request.
*/
void
selrecord(selector, sip)
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
struct thread *selector;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
struct selinfo *sip;
{
struct proc *p;
pid_t mypid;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
mypid = selector->td_proc->p_pid;
if ((sip->si_pid == mypid) &&
(sip->si_thread == selector)) { /* XXXKSE should be an ID? */
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
return;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
}
if (sip->si_pid &&
(p = pfind(sip->si_pid)) &&
(find_thread_in_proc(p, sip->si_thread))) {
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (sip->si_thread->td_wchan == (caddr_t)&selwait) {
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&sched_lock);
Change the pfind() and zpfind() functions to lock the process that they find before releasing the allproc lock and returning. Reviewed by: -smp, dfr, jake
2001-04-24 00:51:53 +00:00
PROC_UNLOCK(p);
- Catch up to proc flag changes. - Add proc locking for selwakeup() and selrecord().
2001-01-24 11:12:37 +00:00
sip->si_flags |= SI_COLL;
return;
}
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_unlock_spin(&sched_lock);
Change the pfind() and zpfind() functions to lock the process that they find before releasing the allproc lock and returning. Reviewed by: -smp, dfr, jake
2001-04-24 00:51:53 +00:00
PROC_UNLOCK(p);
- Catch up to proc flag changes. - Add proc locking for selwakeup() and selrecord().
2001-01-24 11:12:37 +00:00
}
sip->si_pid = mypid;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
sip->si_thread = selector;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
/*
* Do a wakeup when a selectable event occurs.
*/
void
selwakeup(sip)
register struct selinfo *sip;
{
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
struct thread *td;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
register struct proc *p;
if (sip->si_pid == 0)
return;
if (sip->si_flags & SI_COLL) {
nselcoll++;
sip->si_flags &= ~SI_COLL;
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
cv_broadcast(&selwait);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
p = pfind(sip->si_pid);
sip->si_pid = 0;
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td = sip->si_thread;
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
if (p != NULL) {
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (!find_thread_in_proc(p, td)) {
PROC_UNLOCK(p); /* lock is in pfind() */;
return;
}
Change and clean the mutex lock interface. mtx_enter(lock, type) becomes: mtx_lock(lock) for sleep locks (MTX_DEF-initialized locks) mtx_lock_spin(lock) for spin locks (MTX_SPIN-initialized) similarily, for releasing a lock, we now have: mtx_unlock(lock) for MTX_DEF and mtx_unlock_spin(lock) for MTX_SPIN. We change the caller interface for the two different types of locks because the semantics are entirely different for each case, and this makes it explicitly clear and, at the same time, it rids us of the extra `type' argument. The enter->lock and exit->unlock change has been made with the idea that we're "locking data" and not "entering locked code" in mind. Further, remove all additional "flags" previously passed to the lock acquire/release routines with the exception of two: MTX_QUIET and MTX_NOSWITCH The functionality of these flags is preserved and they can be passed to the lock/unlock routines by calling the corresponding wrappers: mtx_{lock, unlock}_flags(lock, flag(s)) and mtx_{lock, unlock}_spin_flags(lock, flag(s)) for MTX_DEF and MTX_SPIN locks, respectively. Re-inline some lock acq/rel code; in the sleep lock case, we only inline the _obtain_lock()s in order to ensure that the inlined code fits into a cache line. In the spin lock case, we inline recursion and actually only perform a function call if we need to spin. This change has been made with the idea that we generally tend to avoid spin locks and that also the spin locks that we do have and are heavily used (i.e. sched_lock) do recurse, and therefore in an effort to reduce function call overhead for some architectures (such as alpha), we inline recursion for this case. Create a new malloc type for the witness code and retire from using the M_DEV type. The new type is called M_WITNESS and is only declared if WITNESS is enabled. Begin cleaning up some machdep/mutex.h code - specifically updated the "optimized" inlined code in alpha/mutex.h and wrote MTX_LOCK_SPIN and MTX_UNLOCK_SPIN asm macros for the i386/mutex.h as we presently need those. Finally, caught up to the interface changes in all sys code. Contributors: jake, jhb, jasone (in no particular order)
2001-02-09 06:11:45 +00:00
mtx_lock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
if (td->td_wchan == (caddr_t)&selwait) {
if (td->td_proc->p_stat == SSLEEP)
setrunnable(td);
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
else
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
cv_waitq_remove(td);
Change the pfind() and zpfind() functions to lock the process that they find before releasing the allproc lock and returning. Reviewed by: -smp, dfr, jake
2001-04-24 00:51:53 +00:00
} else
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
td->td_flags &= ~TDF_SELECT;
Change the pfind() and zpfind() functions to lock the process that they find before releasing the allproc lock and returning. Reviewed by: -smp, dfr, jake
2001-04-24 00:51:53 +00:00
mtx_unlock_spin(&sched_lock);
KSE Milestone 2 Note ALL MODULES MUST BE RECOMPILED make the kernel aware that there are smaller units of scheduling than the process. (but only allow one thread per process at this time). This is functionally equivalent to teh previousl -current except that there is a thread associated with each process. Sorry john! (your next MFC will be a doosie!) Reviewed by: peter@freebsd.org, dillon@freebsd.org X-MFC after: ha ha ha ha
2001-09-12 08:38:13 +00:00
PROC_UNLOCK(p); /* Lock is in pfind() */
BSD 4.4 Lite Kernel Sources
1994-05-24 10:09:53 +00:00
}
}
- Convert msleep(9) in select(2) and poll(2) to cv_*wait*(9). - Since polling should not involve sleeping, keep holding a process lock upon scanning file descriptors. - Hold a reference to every file descriptor prior to entering polling loop in order to avoid lock order reversal between lockmgr and p_mtx upon calling fdrop() in fo_poll(). (NOTE: this work has not been done for netncp and netsmb yet because a socket itself has no reference counts.) Reviewed by: jhb
2001-05-14 05:26:48 +00:00
static void selectinit __P((void *));
SYSINIT(select, SI_SUB_LOCK, SI_ORDER_FIRST, selectinit, NULL)
/* ARGSUSED*/
static void
selectinit(dummy)
void *dummy;
{
cv_init(&selwait, "select");
}
Reference in New Issue Copy Permalink