d2cce3d6e8
malloc and mbuf allocation all not requiring Giant. 1) ostat, fstat and nfstat don't need Giant until they call fo_stat. 2) accept can copyin the address length without grabbing Giant. 3) sendit doesn't need Giant, so don't bother grabbing it until kern_sendit. 4) move Giant grabbing from each indivitual recv* syscall to recvit.
2459 lines
54 KiB
C
2459 lines
54 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1989, 1991, 1993
|
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* The Regents of the University of California. All rights reserved.
|
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* (c) UNIX System Laboratories, Inc.
|
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* 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
|
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* the permission of UNIX System Laboratories, Inc.
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*
|
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
|
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* 1. Redistributions of source code must retain the above copyright
|
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
|
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* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
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* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
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* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* @(#)kern_descrip.c 8.6 (Berkeley) 4/19/94
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|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/syscallsubr.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/event.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/signalvar.h>
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|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/uma.h>
|
|
|
|
static MALLOC_DEFINE(M_FILEDESC, "file desc", "Open file descriptor table");
|
|
static MALLOC_DEFINE(M_FILEDESC_TO_LEADER, "file desc to leader",
|
|
"file desc to leader structures");
|
|
static MALLOC_DEFINE(M_SIGIO, "sigio", "sigio structures");
|
|
|
|
static uma_zone_t file_zone;
|
|
|
|
static d_open_t fdopen;
|
|
#define NUMFDESC 64
|
|
|
|
#define CDEV_MAJOR 22
|
|
static struct cdevsw fildesc_cdevsw = {
|
|
.d_open = fdopen,
|
|
.d_name = "FD",
|
|
.d_maj = CDEV_MAJOR,
|
|
};
|
|
|
|
/* How to treat 'new' parameter when allocating a fd for do_dup(). */
|
|
enum dup_type { DUP_VARIABLE, DUP_FIXED };
|
|
|
|
static int do_dup(struct thread *td, enum dup_type type, int old, int new,
|
|
register_t *retval);
|
|
|
|
/*
|
|
* Descriptor management.
|
|
*/
|
|
struct filelist filehead; /* head of list of open files */
|
|
int nfiles; /* actual number of open files */
|
|
extern int cmask;
|
|
struct sx filelist_lock; /* sx to protect filelist */
|
|
struct mtx sigio_lock; /* mtx to protect pointers to sigio */
|
|
|
|
/*
|
|
* System calls on descriptors.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getdtablesize_args {
|
|
int dummy;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
getdtablesize(td, uap)
|
|
struct thread *td;
|
|
struct getdtablesize_args *uap;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
|
|
mtx_lock(&Giant);
|
|
td->td_retval[0] =
|
|
min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
|
|
mtx_unlock(&Giant);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Duplicate a file descriptor to a particular value.
|
|
*
|
|
* note: keep in mind that a potential race condition exists when closing
|
|
* descriptors from a shared descriptor table (via rfork).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct dup2_args {
|
|
u_int from;
|
|
u_int to;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
dup2(td, uap)
|
|
struct thread *td;
|
|
struct dup2_args *uap;
|
|
{
|
|
|
|
return (do_dup(td, DUP_FIXED, (int)uap->from, (int)uap->to,
|
|
td->td_retval));
|
|
}
|
|
|
|
/*
|
|
* Duplicate a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct dup_args {
|
|
u_int fd;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
dup(td, uap)
|
|
struct thread *td;
|
|
struct dup_args *uap;
|
|
{
|
|
|
|
return (do_dup(td, DUP_VARIABLE, (int)uap->fd, 0, td->td_retval));
|
|
}
|
|
|
|
/*
|
|
* The file control system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fcntl_args {
|
|
int fd;
|
|
int cmd;
|
|
long arg;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
fcntl(td, uap)
|
|
struct thread *td;
|
|
struct fcntl_args *uap;
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|
{
|
|
struct flock fl;
|
|
intptr_t arg;
|
|
int error;
|
|
|
|
error = 0;
|
|
switch (uap->cmd) {
|
|
case F_GETLK:
|
|
case F_SETLK:
|
|
case F_SETLKW:
|
|
error = copyin((void *)(intptr_t)uap->arg, &fl, sizeof(fl));
|
|
arg = (intptr_t)&fl;
|
|
break;
|
|
default:
|
|
arg = uap->arg;
|
|
break;
|
|
}
|
|
if (error)
|
|
return (error);
|
|
error = kern_fcntl(td, uap->fd, uap->cmd, arg);
|
|
if (error)
|
|
return (error);
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|
if (uap->cmd == F_GETLK)
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error = copyout(&fl, (void *)(intptr_t)uap->arg, sizeof(fl));
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|
return (error);
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|
}
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|
|
|
int
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|
kern_fcntl(struct thread *td, int fd, int cmd, intptr_t arg)
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|
{
|
|
struct filedesc *fdp;
|
|
struct flock *flp;
|
|
struct file *fp;
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|
struct proc *p;
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|
char *pop;
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|
struct vnode *vp;
|
|
u_int newmin;
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|
int error, flg, tmp;
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|
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|
error = 0;
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flg = F_POSIX;
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p = td->td_proc;
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fdp = p->p_fd;
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mtx_lock(&Giant);
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FILEDESC_LOCK(fdp);
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if ((unsigned)fd >= fdp->fd_nfiles ||
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(fp = fdp->fd_ofiles[fd]) == NULL) {
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FILEDESC_UNLOCK(fdp);
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error = EBADF;
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goto done2;
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|
}
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pop = &fdp->fd_ofileflags[fd];
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|
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|
switch (cmd) {
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case F_DUPFD:
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|
FILEDESC_UNLOCK(fdp);
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newmin = arg;
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if (newmin >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
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newmin >= maxfilesperproc) {
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error = EINVAL;
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break;
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|
}
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error = do_dup(td, DUP_VARIABLE, fd, newmin, td->td_retval);
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break;
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|
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|
case F_GETFD:
|
|
td->td_retval[0] = (*pop & UF_EXCLOSE) ? FD_CLOEXEC : 0;
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|
FILEDESC_UNLOCK(fdp);
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|
break;
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|
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|
case F_SETFD:
|
|
*pop = (*pop &~ UF_EXCLOSE) |
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(arg & FD_CLOEXEC ? UF_EXCLOSE : 0);
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FILEDESC_UNLOCK(fdp);
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break;
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|
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|
case F_GETFL:
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|
FILE_LOCK(fp);
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|
FILEDESC_UNLOCK(fdp);
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td->td_retval[0] = OFLAGS(fp->f_flag);
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FILE_UNLOCK(fp);
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|
break;
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|
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|
case F_SETFL:
|
|
FILE_LOCK(fp);
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|
FILEDESC_UNLOCK(fdp);
|
|
fhold_locked(fp);
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|
fp->f_flag &= ~FCNTLFLAGS;
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|
fp->f_flag |= FFLAGS(arg & ~O_ACCMODE) & FCNTLFLAGS;
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|
FILE_UNLOCK(fp);
|
|
tmp = fp->f_flag & FNONBLOCK;
|
|
error = fo_ioctl(fp, FIONBIO, &tmp, td->td_ucred, td);
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|
if (error) {
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|
fdrop(fp, td);
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|
break;
|
|
}
|
|
tmp = fp->f_flag & FASYNC;
|
|
error = fo_ioctl(fp, FIOASYNC, &tmp, td->td_ucred, td);
|
|
if (error == 0) {
|
|
fdrop(fp, td);
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|
break;
|
|
}
|
|
FILE_LOCK(fp);
|
|
fp->f_flag &= ~FNONBLOCK;
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|
FILE_UNLOCK(fp);
|
|
tmp = 0;
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|
(void)fo_ioctl(fp, FIONBIO, &tmp, td->td_ucred, td);
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|
fdrop(fp, td);
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break;
|
|
|
|
case F_GETOWN:
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = fo_ioctl(fp, FIOGETOWN, &tmp, td->td_ucred, td);
|
|
if (error == 0)
|
|
td->td_retval[0] = tmp;
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETOWN:
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
tmp = arg;
|
|
error = fo_ioctl(fp, FIOSETOWN, &tmp, td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_SETLKW:
|
|
flg |= F_WAIT;
|
|
/* FALLTHROUGH F_SETLK */
|
|
|
|
case F_SETLK:
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
|
|
flp = (struct flock *)arg;
|
|
if (flp->l_whence == SEEK_CUR) {
|
|
if (fp->f_offset < 0 ||
|
|
(flp->l_start > 0 &&
|
|
fp->f_offset > OFF_MAX - flp->l_start)) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EOVERFLOW;
|
|
break;
|
|
}
|
|
flp->l_start += fp->f_offset;
|
|
}
|
|
|
|
/*
|
|
* VOP_ADVLOCK() may block.
|
|
*/
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
vp = fp->f_vnode;
|
|
|
|
switch (flp->l_type) {
|
|
case F_RDLCK:
|
|
if ((fp->f_flag & FREAD) == 0) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
PROC_LOCK(p->p_leader);
|
|
p->p_leader->p_flag |= P_ADVLOCK;
|
|
PROC_UNLOCK(p->p_leader);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_SETLK,
|
|
flp, flg);
|
|
break;
|
|
case F_WRLCK:
|
|
if ((fp->f_flag & FWRITE) == 0) {
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
PROC_LOCK(p->p_leader);
|
|
p->p_leader->p_flag |= P_ADVLOCK;
|
|
PROC_UNLOCK(p->p_leader);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_SETLK,
|
|
flp, flg);
|
|
break;
|
|
case F_UNLCK:
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_UNLCK,
|
|
flp, F_POSIX);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
/* Check for race with close */
|
|
FILEDESC_LOCK(fdp);
|
|
if ((unsigned) fd >= fdp->fd_nfiles ||
|
|
fp != fdp->fd_ofiles[fd]) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
flp->l_whence = SEEK_SET;
|
|
flp->l_start = 0;
|
|
flp->l_len = 0;
|
|
flp->l_type = F_UNLCK;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)p->p_leader,
|
|
F_UNLCK, flp, F_POSIX);
|
|
} else
|
|
FILEDESC_UNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
break;
|
|
|
|
case F_GETLK:
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EBADF;
|
|
break;
|
|
}
|
|
flp = (struct flock *)arg;
|
|
if (flp->l_type != F_RDLCK && flp->l_type != F_WRLCK &&
|
|
flp->l_type != F_UNLCK) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
if (flp->l_whence == SEEK_CUR) {
|
|
if ((flp->l_start > 0 &&
|
|
fp->f_offset > OFF_MAX - flp->l_start) ||
|
|
(flp->l_start < 0 &&
|
|
fp->f_offset < OFF_MIN - flp->l_start)) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EOVERFLOW;
|
|
break;
|
|
}
|
|
flp->l_start += fp->f_offset;
|
|
}
|
|
/*
|
|
* VOP_ADVLOCK() may block.
|
|
*/
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
vp = fp->f_vnode;
|
|
error = VOP_ADVLOCK(vp, (caddr_t)p->p_leader, F_GETLK, flp,
|
|
F_POSIX);
|
|
fdrop(fp, td);
|
|
break;
|
|
default:
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common code for dup, dup2, and fcntl(F_DUPFD).
|
|
*/
|
|
static int
|
|
do_dup(td, type, old, new, retval)
|
|
enum dup_type type;
|
|
int old, new;
|
|
register_t *retval;
|
|
struct thread *td;
|
|
{
|
|
struct filedesc *fdp;
|
|
struct proc *p;
|
|
struct file *fp;
|
|
struct file *delfp;
|
|
int error, newfd;
|
|
int holdleaders;
|
|
|
|
p = td->td_proc;
|
|
fdp = p->p_fd;
|
|
|
|
/*
|
|
* Verify we have a valid descriptor to dup from and possibly to
|
|
* dup to.
|
|
*/
|
|
if (old < 0 || new < 0 || new >= p->p_rlimit[RLIMIT_NOFILE].rlim_cur ||
|
|
new >= maxfilesperproc)
|
|
return (EBADF);
|
|
FILEDESC_LOCK(fdp);
|
|
if (old >= fdp->fd_nfiles || fdp->fd_ofiles[old] == NULL) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
if (type == DUP_FIXED && old == new) {
|
|
*retval = new;
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (0);
|
|
}
|
|
fp = fdp->fd_ofiles[old];
|
|
fhold(fp);
|
|
|
|
/*
|
|
* Expand the table for the new descriptor if needed. This may
|
|
* block and drop and reacquire the filedesc lock.
|
|
*/
|
|
if (type == DUP_VARIABLE || new >= fdp->fd_nfiles) {
|
|
error = fdalloc(td, new, &newfd);
|
|
if (error) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
}
|
|
if (type == DUP_VARIABLE)
|
|
new = newfd;
|
|
|
|
/*
|
|
* If the old file changed out from under us then treat it as a
|
|
* bad file descriptor. Userland should do its own locking to
|
|
* avoid this case.
|
|
*/
|
|
if (fdp->fd_ofiles[old] != fp) {
|
|
if (fdp->fd_ofiles[new] == NULL) {
|
|
if (new < fdp->fd_freefile)
|
|
fdp->fd_freefile = new;
|
|
while (fdp->fd_lastfile > 0 &&
|
|
fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
}
|
|
FILEDESC_UNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
return (EBADF);
|
|
}
|
|
KASSERT(old != new, ("new fd is same as old"));
|
|
|
|
/*
|
|
* Save info on the descriptor being overwritten. We have
|
|
* to do the unmap now, but we cannot close it without
|
|
* introducing an ownership race for the slot.
|
|
*/
|
|
delfp = fdp->fd_ofiles[new];
|
|
if (delfp != NULL && p->p_fdtol != NULL) {
|
|
/*
|
|
* Ask fdfree() to sleep to ensure that all relevant
|
|
* process leaders can be traversed in closef().
|
|
*/
|
|
fdp->fd_holdleaderscount++;
|
|
holdleaders = 1;
|
|
} else
|
|
holdleaders = 0;
|
|
KASSERT(delfp == NULL || type == DUP_FIXED,
|
|
("dup() picked an open file"));
|
|
#if 0
|
|
if (delfp && (fdp->fd_ofileflags[new] & UF_MAPPED))
|
|
(void) munmapfd(td, new);
|
|
#endif
|
|
|
|
/*
|
|
* Duplicate the source descriptor, update lastfile
|
|
*/
|
|
fdp->fd_ofiles[new] = fp;
|
|
fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
|
|
if (new > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = new;
|
|
FILEDESC_UNLOCK(fdp);
|
|
*retval = new;
|
|
|
|
/*
|
|
* If we dup'd over a valid file, we now own the reference to it
|
|
* and must dispose of it using closef() semantics (as if a
|
|
* close() were performed on it).
|
|
*/
|
|
if (delfp) {
|
|
mtx_lock(&Giant);
|
|
(void) closef(delfp, td);
|
|
mtx_unlock(&Giant);
|
|
if (holdleaders) {
|
|
FILEDESC_LOCK(fdp);
|
|
fdp->fd_holdleaderscount--;
|
|
if (fdp->fd_holdleaderscount == 0 &&
|
|
fdp->fd_holdleaderswakeup != 0) {
|
|
fdp->fd_holdleaderswakeup = 0;
|
|
wakeup(&fdp->fd_holdleaderscount);
|
|
}
|
|
FILEDESC_UNLOCK(fdp);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* If sigio is on the list associated with a process or process group,
|
|
* disable signalling from the device, remove sigio from the list and
|
|
* free sigio.
|
|
*/
|
|
void
|
|
funsetown(sigiop)
|
|
struct sigio **sigiop;
|
|
{
|
|
struct sigio *sigio;
|
|
|
|
SIGIO_LOCK();
|
|
sigio = *sigiop;
|
|
if (sigio == NULL) {
|
|
SIGIO_UNLOCK();
|
|
return;
|
|
}
|
|
*(sigio->sio_myref) = NULL;
|
|
if ((sigio)->sio_pgid < 0) {
|
|
struct pgrp *pg = (sigio)->sio_pgrp;
|
|
PGRP_LOCK(pg);
|
|
SLIST_REMOVE(&sigio->sio_pgrp->pg_sigiolst, sigio,
|
|
sigio, sio_pgsigio);
|
|
PGRP_UNLOCK(pg);
|
|
} else {
|
|
struct proc *p = (sigio)->sio_proc;
|
|
PROC_LOCK(p);
|
|
SLIST_REMOVE(&sigio->sio_proc->p_sigiolst, sigio,
|
|
sigio, sio_pgsigio);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
SIGIO_UNLOCK();
|
|
crfree(sigio->sio_ucred);
|
|
FREE(sigio, M_SIGIO);
|
|
}
|
|
|
|
/*
|
|
* Free a list of sigio structures.
|
|
* We only need to lock the SIGIO_LOCK because we have made ourselves
|
|
* inaccessable to callers of fsetown and therefore do not need to lock
|
|
* the proc or pgrp struct for the list manipulation.
|
|
*/
|
|
void
|
|
funsetownlst(sigiolst)
|
|
struct sigiolst *sigiolst;
|
|
{
|
|
struct proc *p;
|
|
struct pgrp *pg;
|
|
struct sigio *sigio;
|
|
|
|
sigio = SLIST_FIRST(sigiolst);
|
|
if (sigio == NULL)
|
|
return;
|
|
p = NULL;
|
|
pg = NULL;
|
|
|
|
/*
|
|
* Every entry of the list should belong
|
|
* to a single proc or pgrp.
|
|
*/
|
|
if (sigio->sio_pgid < 0) {
|
|
pg = sigio->sio_pgrp;
|
|
PGRP_LOCK_ASSERT(pg, MA_NOTOWNED);
|
|
} else /* if (sigio->sio_pgid > 0) */ {
|
|
p = sigio->sio_proc;
|
|
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
|
|
}
|
|
|
|
SIGIO_LOCK();
|
|
while ((sigio = SLIST_FIRST(sigiolst)) != NULL) {
|
|
*(sigio->sio_myref) = NULL;
|
|
if (pg != NULL) {
|
|
KASSERT(sigio->sio_pgid < 0,
|
|
("Proc sigio in pgrp sigio list"));
|
|
KASSERT(sigio->sio_pgrp == pg,
|
|
("Bogus pgrp in sigio list"));
|
|
PGRP_LOCK(pg);
|
|
SLIST_REMOVE(&pg->pg_sigiolst, sigio, sigio,
|
|
sio_pgsigio);
|
|
PGRP_UNLOCK(pg);
|
|
} else /* if (p != NULL) */ {
|
|
KASSERT(sigio->sio_pgid > 0,
|
|
("Pgrp sigio in proc sigio list"));
|
|
KASSERT(sigio->sio_proc == p,
|
|
("Bogus proc in sigio list"));
|
|
PROC_LOCK(p);
|
|
SLIST_REMOVE(&p->p_sigiolst, sigio, sigio,
|
|
sio_pgsigio);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
SIGIO_UNLOCK();
|
|
crfree(sigio->sio_ucred);
|
|
FREE(sigio, M_SIGIO);
|
|
SIGIO_LOCK();
|
|
}
|
|
SIGIO_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* This is common code for FIOSETOWN ioctl called by fcntl(fd, F_SETOWN, arg).
|
|
*
|
|
* After permission checking, add a sigio structure to the sigio list for
|
|
* the process or process group.
|
|
*/
|
|
int
|
|
fsetown(pgid, sigiop)
|
|
pid_t pgid;
|
|
struct sigio **sigiop;
|
|
{
|
|
struct proc *proc;
|
|
struct pgrp *pgrp;
|
|
struct sigio *sigio;
|
|
int ret;
|
|
|
|
if (pgid == 0) {
|
|
funsetown(sigiop);
|
|
return (0);
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
/* Allocate and fill in the new sigio out of locks. */
|
|
MALLOC(sigio, struct sigio *, sizeof(struct sigio), M_SIGIO, M_WAITOK);
|
|
sigio->sio_pgid = pgid;
|
|
sigio->sio_ucred = crhold(curthread->td_ucred);
|
|
sigio->sio_myref = sigiop;
|
|
|
|
sx_slock(&proctree_lock);
|
|
if (pgid > 0) {
|
|
proc = pfind(pgid);
|
|
if (proc == NULL) {
|
|
ret = ESRCH;
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Policy - Don't allow a process to FSETOWN a process
|
|
* in another session.
|
|
*
|
|
* Remove this test to allow maximum flexibility or
|
|
* restrict FSETOWN to the current process or process
|
|
* group for maximum safety.
|
|
*/
|
|
PROC_UNLOCK(proc);
|
|
if (proc->p_session != curthread->td_proc->p_session) {
|
|
ret = EPERM;
|
|
goto fail;
|
|
}
|
|
|
|
pgrp = NULL;
|
|
} else /* if (pgid < 0) */ {
|
|
pgrp = pgfind(-pgid);
|
|
if (pgrp == NULL) {
|
|
ret = ESRCH;
|
|
goto fail;
|
|
}
|
|
PGRP_UNLOCK(pgrp);
|
|
|
|
/*
|
|
* Policy - Don't allow a process to FSETOWN a process
|
|
* in another session.
|
|
*
|
|
* Remove this test to allow maximum flexibility or
|
|
* restrict FSETOWN to the current process or process
|
|
* group for maximum safety.
|
|
*/
|
|
if (pgrp->pg_session != curthread->td_proc->p_session) {
|
|
ret = EPERM;
|
|
goto fail;
|
|
}
|
|
|
|
proc = NULL;
|
|
}
|
|
funsetown(sigiop);
|
|
if (pgid > 0) {
|
|
PROC_LOCK(proc);
|
|
/*
|
|
* Since funsetownlst() is called without the proctree
|
|
* locked, we need to check for P_WEXIT.
|
|
* XXX: is ESRCH correct?
|
|
*/
|
|
if ((proc->p_flag & P_WEXIT) != 0) {
|
|
PROC_UNLOCK(proc);
|
|
ret = ESRCH;
|
|
goto fail;
|
|
}
|
|
SLIST_INSERT_HEAD(&proc->p_sigiolst, sigio, sio_pgsigio);
|
|
sigio->sio_proc = proc;
|
|
PROC_UNLOCK(proc);
|
|
} else {
|
|
PGRP_LOCK(pgrp);
|
|
SLIST_INSERT_HEAD(&pgrp->pg_sigiolst, sigio, sio_pgsigio);
|
|
sigio->sio_pgrp = pgrp;
|
|
PGRP_UNLOCK(pgrp);
|
|
}
|
|
sx_sunlock(&proctree_lock);
|
|
SIGIO_LOCK();
|
|
*sigiop = sigio;
|
|
SIGIO_UNLOCK();
|
|
return (0);
|
|
|
|
fail:
|
|
sx_sunlock(&proctree_lock);
|
|
crfree(sigio->sio_ucred);
|
|
FREE(sigio, M_SIGIO);
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* This is common code for FIOGETOWN ioctl called by fcntl(fd, F_GETOWN, arg).
|
|
*/
|
|
pid_t
|
|
fgetown(sigiop)
|
|
struct sigio **sigiop;
|
|
{
|
|
pid_t pgid;
|
|
|
|
SIGIO_LOCK();
|
|
pgid = (*sigiop != NULL) ? (*sigiop)->sio_pgid : 0;
|
|
SIGIO_UNLOCK();
|
|
return (pgid);
|
|
}
|
|
|
|
/*
|
|
* Close a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct close_args {
|
|
int fd;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
close(td, uap)
|
|
struct thread *td;
|
|
struct close_args *uap;
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
int fd, error;
|
|
int holdleaders;
|
|
|
|
fd = uap->fd;
|
|
error = 0;
|
|
holdleaders = 0;
|
|
fdp = td->td_proc->p_fd;
|
|
mtx_lock(&Giant);
|
|
FILEDESC_LOCK(fdp);
|
|
if ((unsigned)fd >= fdp->fd_nfiles ||
|
|
(fp = fdp->fd_ofiles[fd]) == NULL) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
#if 0
|
|
if (fdp->fd_ofileflags[fd] & UF_MAPPED)
|
|
(void) munmapfd(td, fd);
|
|
#endif
|
|
fdp->fd_ofiles[fd] = NULL;
|
|
fdp->fd_ofileflags[fd] = 0;
|
|
if (td->td_proc->p_fdtol != NULL) {
|
|
/*
|
|
* Ask fdfree() to sleep to ensure that all relevant
|
|
* process leaders can be traversed in closef().
|
|
*/
|
|
fdp->fd_holdleaderscount++;
|
|
holdleaders = 1;
|
|
}
|
|
|
|
/*
|
|
* we now hold the fp reference that used to be owned by the descriptor
|
|
* array.
|
|
*/
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
if (fd < fdp->fd_freefile)
|
|
fdp->fd_freefile = fd;
|
|
if (fd < fdp->fd_knlistsize) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
knote_fdclose(td, fd);
|
|
} else
|
|
FILEDESC_UNLOCK(fdp);
|
|
|
|
error = closef(fp, td);
|
|
done2:
|
|
mtx_unlock(&Giant);
|
|
if (holdleaders) {
|
|
FILEDESC_LOCK(fdp);
|
|
fdp->fd_holdleaderscount--;
|
|
if (fdp->fd_holdleaderscount == 0 &&
|
|
fdp->fd_holdleaderswakeup != 0) {
|
|
fdp->fd_holdleaderswakeup = 0;
|
|
wakeup(&fdp->fd_holdleaderscount);
|
|
}
|
|
FILEDESC_UNLOCK(fdp);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ofstat_args {
|
|
int fd;
|
|
struct ostat *sb;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
ofstat(td, uap)
|
|
struct thread *td;
|
|
struct ofstat_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct stat ub;
|
|
struct ostat oub;
|
|
int error;
|
|
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
mtx_lock(&Giant);
|
|
error = fo_stat(fp, &ub, td->td_ucred, td);
|
|
mtx_unlock(&Giant);
|
|
if (error == 0) {
|
|
cvtstat(&ub, &oub);
|
|
error = copyout(&oub, uap->sb, sizeof(oub));
|
|
}
|
|
fdrop(fp, td);
|
|
done2:
|
|
return (error);
|
|
}
|
|
#endif /* COMPAT_43 || COMPAT_SUNOS */
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fstat_args {
|
|
int fd;
|
|
struct stat *sb;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
fstat(td, uap)
|
|
struct thread *td;
|
|
struct fstat_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct stat ub;
|
|
int error;
|
|
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
mtx_lock(&Giant);
|
|
error = fo_stat(fp, &ub, td->td_ucred, td);
|
|
mtx_unlock(&Giant);
|
|
if (error == 0)
|
|
error = copyout(&ub, uap->sb, sizeof(ub));
|
|
fdrop(fp, td);
|
|
done2:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return status information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct nfstat_args {
|
|
int fd;
|
|
struct nstat *sb;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
nfstat(td, uap)
|
|
struct thread *td;
|
|
struct nfstat_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct stat ub;
|
|
struct nstat nub;
|
|
int error;
|
|
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
goto done2;
|
|
mtx_lock(&Giant);
|
|
error = fo_stat(fp, &ub, td->td_ucred, td);
|
|
mtx_unlock(&Giant);
|
|
if (error == 0) {
|
|
cvtnstat(&ub, &nub);
|
|
error = copyout(&nub, uap->sb, sizeof(nub));
|
|
}
|
|
fdrop(fp, td);
|
|
done2:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return pathconf information about a file descriptor.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct fpathconf_args {
|
|
int fd;
|
|
int name;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
fpathconf(td, uap)
|
|
struct thread *td;
|
|
struct fpathconf_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
return (error);
|
|
|
|
/* If asynchronous I/O is available, it works for all descriptors. */
|
|
if (uap->name == _PC_ASYNC_IO) {
|
|
td->td_retval[0] = async_io_version;
|
|
goto out;
|
|
}
|
|
vp = fp->f_vnode;
|
|
if (vp != NULL) {
|
|
mtx_lock(&Giant);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
error = VOP_PATHCONF(vp, uap->name, td->td_retval);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
mtx_unlock(&Giant);
|
|
} else if (fp->f_type == DTYPE_PIPE || fp->f_type == DTYPE_SOCKET) {
|
|
if (uap->name != _PC_PIPE_BUF) {
|
|
error = EINVAL;
|
|
} else {
|
|
td->td_retval[0] = PIPE_BUF;
|
|
error = 0;
|
|
}
|
|
} else {
|
|
error = EOPNOTSUPP;
|
|
}
|
|
out:
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Allocate a file descriptor for the process.
|
|
*/
|
|
static int fdexpand;
|
|
SYSCTL_INT(_debug, OID_AUTO, fdexpand, CTLFLAG_RD, &fdexpand, 0, "");
|
|
|
|
int
|
|
fdalloc(td, want, result)
|
|
struct thread *td;
|
|
int want;
|
|
int *result;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
int i;
|
|
int lim, last, nfiles;
|
|
struct file **newofile, **oldofile;
|
|
char *newofileflags;
|
|
|
|
FILEDESC_LOCK_ASSERT(fdp, MA_OWNED);
|
|
|
|
/*
|
|
* Search for a free descriptor starting at the higher
|
|
* of want or fd_freefile. If that fails, consider
|
|
* expanding the ofile array.
|
|
*/
|
|
lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
|
|
for (;;) {
|
|
last = min(fdp->fd_nfiles, lim);
|
|
i = max(want, fdp->fd_freefile);
|
|
for (; i < last; i++) {
|
|
if (fdp->fd_ofiles[i] == NULL) {
|
|
fdp->fd_ofileflags[i] = 0;
|
|
if (i > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = i;
|
|
if (want <= fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
*result = i;
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* No space in current array. Expand?
|
|
*/
|
|
if (i >= lim)
|
|
return (EMFILE);
|
|
if (fdp->fd_nfiles < NDEXTENT)
|
|
nfiles = NDEXTENT;
|
|
else
|
|
nfiles = 2 * fdp->fd_nfiles;
|
|
while (nfiles < want)
|
|
nfiles <<= 1;
|
|
FILEDESC_UNLOCK(fdp);
|
|
newofile = malloc(nfiles * OFILESIZE, M_FILEDESC, M_WAITOK);
|
|
|
|
/*
|
|
* Deal with file-table extend race that might have
|
|
* occurred while filedesc was unlocked.
|
|
*/
|
|
FILEDESC_LOCK(fdp);
|
|
if (fdp->fd_nfiles >= nfiles) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
free(newofile, M_FILEDESC);
|
|
FILEDESC_LOCK(fdp);
|
|
continue;
|
|
}
|
|
newofileflags = (char *) &newofile[nfiles];
|
|
/*
|
|
* Copy the existing ofile and ofileflags arrays
|
|
* and zero the new portion of each array.
|
|
*/
|
|
i = fdp->fd_nfiles * sizeof(struct file *);
|
|
bcopy(fdp->fd_ofiles, newofile, i);
|
|
bzero((char *)newofile + i,
|
|
nfiles * sizeof(struct file *) - i);
|
|
i = fdp->fd_nfiles * sizeof(char);
|
|
bcopy(fdp->fd_ofileflags, newofileflags, i);
|
|
bzero(newofileflags + i, nfiles * sizeof(char) - i);
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
oldofile = fdp->fd_ofiles;
|
|
else
|
|
oldofile = NULL;
|
|
fdp->fd_ofiles = newofile;
|
|
fdp->fd_ofileflags = newofileflags;
|
|
fdp->fd_nfiles = nfiles;
|
|
fdexpand++;
|
|
if (oldofile != NULL) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
free(oldofile, M_FILEDESC);
|
|
FILEDESC_LOCK(fdp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check to see whether n user file descriptors
|
|
* are available to the process p.
|
|
*/
|
|
int
|
|
fdavail(td, n)
|
|
struct thread *td;
|
|
int n;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
struct file **fpp;
|
|
int i, lim, last;
|
|
|
|
FILEDESC_LOCK_ASSERT(fdp, MA_OWNED);
|
|
|
|
lim = min((int)p->p_rlimit[RLIMIT_NOFILE].rlim_cur, maxfilesperproc);
|
|
if ((i = lim - fdp->fd_nfiles) > 0 && (n -= i) <= 0)
|
|
return (1);
|
|
last = min(fdp->fd_nfiles, lim);
|
|
fpp = &fdp->fd_ofiles[fdp->fd_freefile];
|
|
for (i = last - fdp->fd_freefile; --i >= 0; fpp++) {
|
|
if (*fpp == NULL && --n <= 0)
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Create a new open file structure and allocate
|
|
* a file decriptor for the process that refers to it.
|
|
*/
|
|
int
|
|
falloc(td, resultfp, resultfd)
|
|
struct thread *td;
|
|
struct file **resultfp;
|
|
int *resultfd;
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct file *fp, *fq;
|
|
int error, i;
|
|
int maxuserfiles = maxfiles - (maxfiles / 20);
|
|
static struct timeval lastfail;
|
|
static int curfail;
|
|
|
|
fp = uma_zalloc(file_zone, M_WAITOK | M_ZERO);
|
|
sx_xlock(&filelist_lock);
|
|
if ((nfiles >= maxuserfiles && td->td_ucred->cr_ruid != 0)
|
|
|| nfiles >= maxfiles) {
|
|
if (ppsratecheck(&lastfail, &curfail, 1)) {
|
|
printf("kern.maxfiles limit exceeded by uid %i, please see tuning(7).\n",
|
|
td->td_ucred->cr_ruid);
|
|
}
|
|
sx_xunlock(&filelist_lock);
|
|
uma_zfree(file_zone, fp);
|
|
return (ENFILE);
|
|
}
|
|
nfiles++;
|
|
|
|
/*
|
|
* If the process has file descriptor zero open, add the new file
|
|
* descriptor to the list of open files at that point, otherwise
|
|
* put it at the front of the list of open files.
|
|
*/
|
|
fp->f_mtxp = mtx_pool_alloc(mtxpool_sleep);
|
|
fp->f_count = 1;
|
|
fp->f_cred = crhold(td->td_ucred);
|
|
fp->f_ops = &badfileops;
|
|
FILEDESC_LOCK(p->p_fd);
|
|
if ((fq = p->p_fd->fd_ofiles[0])) {
|
|
LIST_INSERT_AFTER(fq, fp, f_list);
|
|
} else {
|
|
LIST_INSERT_HEAD(&filehead, fp, f_list);
|
|
}
|
|
sx_xunlock(&filelist_lock);
|
|
if ((error = fdalloc(td, 0, &i))) {
|
|
FILEDESC_UNLOCK(p->p_fd);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
p->p_fd->fd_ofiles[i] = fp;
|
|
FILEDESC_UNLOCK(p->p_fd);
|
|
if (resultfp)
|
|
*resultfp = fp;
|
|
if (resultfd)
|
|
*resultfd = i;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Free a file descriptor.
|
|
*/
|
|
void
|
|
ffree(fp)
|
|
struct file *fp;
|
|
{
|
|
|
|
KASSERT(fp->f_count == 0, ("ffree: fp_fcount not 0!"));
|
|
sx_xlock(&filelist_lock);
|
|
LIST_REMOVE(fp, f_list);
|
|
nfiles--;
|
|
sx_xunlock(&filelist_lock);
|
|
crfree(fp->f_cred);
|
|
uma_zfree(file_zone, fp);
|
|
}
|
|
|
|
/*
|
|
* Build a new filedesc structure from another.
|
|
* Copy the current, root, and jail root vnode references.
|
|
*/
|
|
struct filedesc *
|
|
fdinit(fdp)
|
|
struct filedesc *fdp;
|
|
{
|
|
struct filedesc0 *newfdp;
|
|
|
|
MALLOC(newfdp, struct filedesc0 *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK | M_ZERO);
|
|
mtx_init(&newfdp->fd_fd.fd_mtx, FILEDESC_LOCK_DESC, NULL, MTX_DEF);
|
|
newfdp->fd_fd.fd_cdir = fdp->fd_cdir;
|
|
if (newfdp->fd_fd.fd_cdir)
|
|
VREF(newfdp->fd_fd.fd_cdir);
|
|
newfdp->fd_fd.fd_rdir = fdp->fd_rdir;
|
|
if (newfdp->fd_fd.fd_rdir)
|
|
VREF(newfdp->fd_fd.fd_rdir);
|
|
newfdp->fd_fd.fd_jdir = fdp->fd_jdir;
|
|
if (newfdp->fd_fd.fd_jdir)
|
|
VREF(newfdp->fd_fd.fd_jdir);
|
|
|
|
/* Create the file descriptor table. */
|
|
newfdp->fd_fd.fd_refcnt = 1;
|
|
newfdp->fd_fd.fd_cmask = cmask;
|
|
newfdp->fd_fd.fd_ofiles = newfdp->fd_dfiles;
|
|
newfdp->fd_fd.fd_ofileflags = newfdp->fd_dfileflags;
|
|
newfdp->fd_fd.fd_nfiles = NDFILE;
|
|
newfdp->fd_fd.fd_knlistsize = -1;
|
|
return (&newfdp->fd_fd);
|
|
}
|
|
|
|
/*
|
|
* Share a filedesc structure.
|
|
*/
|
|
struct filedesc *
|
|
fdshare(fdp)
|
|
struct filedesc *fdp;
|
|
{
|
|
FILEDESC_LOCK(fdp);
|
|
fdp->fd_refcnt++;
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (fdp);
|
|
}
|
|
|
|
/*
|
|
* Copy a filedesc structure.
|
|
* A NULL pointer in returns a NULL reference, this is to ease callers,
|
|
* not catch errors.
|
|
*/
|
|
struct filedesc *
|
|
fdcopy(fdp)
|
|
struct filedesc *fdp;
|
|
{
|
|
struct filedesc *newfdp;
|
|
struct file **fpp;
|
|
int i, j;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
if (fdp == NULL)
|
|
return (NULL);
|
|
|
|
FILEDESC_LOCK_ASSERT(fdp, MA_OWNED);
|
|
|
|
FILEDESC_UNLOCK(fdp);
|
|
MALLOC(newfdp, struct filedesc *, sizeof(struct filedesc0),
|
|
M_FILEDESC, M_WAITOK);
|
|
FILEDESC_LOCK(fdp);
|
|
bcopy(fdp, newfdp, sizeof(struct filedesc));
|
|
FILEDESC_UNLOCK(fdp);
|
|
bzero(&newfdp->fd_mtx, sizeof(newfdp->fd_mtx));
|
|
mtx_init(&newfdp->fd_mtx, FILEDESC_LOCK_DESC, NULL, MTX_DEF);
|
|
if (newfdp->fd_cdir)
|
|
VREF(newfdp->fd_cdir);
|
|
if (newfdp->fd_rdir)
|
|
VREF(newfdp->fd_rdir);
|
|
if (newfdp->fd_jdir)
|
|
VREF(newfdp->fd_jdir);
|
|
newfdp->fd_refcnt = 1;
|
|
|
|
/*
|
|
* If the number of open files fits in the internal arrays
|
|
* of the open file structure, use them, otherwise allocate
|
|
* additional memory for the number of descriptors currently
|
|
* in use.
|
|
*/
|
|
FILEDESC_LOCK(fdp);
|
|
newfdp->fd_lastfile = fdp->fd_lastfile;
|
|
newfdp->fd_nfiles = fdp->fd_nfiles;
|
|
if (newfdp->fd_lastfile < NDFILE) {
|
|
newfdp->fd_ofiles = ((struct filedesc0 *) newfdp)->fd_dfiles;
|
|
newfdp->fd_ofileflags =
|
|
((struct filedesc0 *) newfdp)->fd_dfileflags;
|
|
i = NDFILE;
|
|
} else {
|
|
/*
|
|
* Compute the smallest multiple of NDEXTENT needed
|
|
* for the file descriptors currently in use,
|
|
* allowing the table to shrink.
|
|
*/
|
|
retry:
|
|
i = newfdp->fd_nfiles;
|
|
while (i > 2 * NDEXTENT && i > newfdp->fd_lastfile * 2)
|
|
i /= 2;
|
|
FILEDESC_UNLOCK(fdp);
|
|
MALLOC(newfdp->fd_ofiles, struct file **, i * OFILESIZE,
|
|
M_FILEDESC, M_WAITOK);
|
|
FILEDESC_LOCK(fdp);
|
|
newfdp->fd_lastfile = fdp->fd_lastfile;
|
|
newfdp->fd_nfiles = fdp->fd_nfiles;
|
|
j = newfdp->fd_nfiles;
|
|
while (j > 2 * NDEXTENT && j > newfdp->fd_lastfile * 2)
|
|
j /= 2;
|
|
if (i != j) {
|
|
/*
|
|
* The size of the original table has changed.
|
|
* Go over once again.
|
|
*/
|
|
FILEDESC_UNLOCK(fdp);
|
|
FREE(newfdp->fd_ofiles, M_FILEDESC);
|
|
FILEDESC_LOCK(fdp);
|
|
newfdp->fd_lastfile = fdp->fd_lastfile;
|
|
newfdp->fd_nfiles = fdp->fd_nfiles;
|
|
goto retry;
|
|
}
|
|
newfdp->fd_ofileflags = (char *) &newfdp->fd_ofiles[i];
|
|
}
|
|
newfdp->fd_nfiles = i;
|
|
bcopy(fdp->fd_ofiles, newfdp->fd_ofiles, i * sizeof(struct file **));
|
|
bcopy(fdp->fd_ofileflags, newfdp->fd_ofileflags, i * sizeof(char));
|
|
|
|
/*
|
|
* kq descriptors cannot be copied.
|
|
*/
|
|
if (newfdp->fd_knlistsize != -1) {
|
|
fpp = &newfdp->fd_ofiles[newfdp->fd_lastfile];
|
|
for (i = newfdp->fd_lastfile; i >= 0; i--, fpp--) {
|
|
if (*fpp != NULL && (*fpp)->f_type == DTYPE_KQUEUE) {
|
|
*fpp = NULL;
|
|
if (i < newfdp->fd_freefile)
|
|
newfdp->fd_freefile = i;
|
|
}
|
|
if (*fpp == NULL && i == newfdp->fd_lastfile && i > 0)
|
|
newfdp->fd_lastfile--;
|
|
}
|
|
newfdp->fd_knlist = NULL;
|
|
newfdp->fd_knlistsize = -1;
|
|
newfdp->fd_knhash = NULL;
|
|
newfdp->fd_knhashmask = 0;
|
|
}
|
|
|
|
fpp = newfdp->fd_ofiles;
|
|
for (i = newfdp->fd_lastfile; i-- >= 0; fpp++) {
|
|
if (*fpp != NULL)
|
|
fhold(*fpp);
|
|
}
|
|
return (newfdp);
|
|
}
|
|
|
|
/* A mutex to protect the association between a proc and filedesc. */
|
|
struct mtx fdesc_mtx;
|
|
MTX_SYSINIT(fdesc, &fdesc_mtx, "fdesc", MTX_DEF);
|
|
|
|
/*
|
|
* Release a filedesc structure.
|
|
*/
|
|
void
|
|
fdfree(td)
|
|
struct thread *td;
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file **fpp;
|
|
int i;
|
|
struct filedesc_to_leader *fdtol;
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
fdp = td->td_proc->p_fd;
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
/* Check for special need to clear POSIX style locks */
|
|
fdtol = td->td_proc->p_fdtol;
|
|
if (fdtol != NULL) {
|
|
FILEDESC_LOCK(fdp);
|
|
KASSERT(fdtol->fdl_refcount > 0,
|
|
("filedesc_to_refcount botch: fdl_refcount=%d",
|
|
fdtol->fdl_refcount));
|
|
if (fdtol->fdl_refcount == 1 &&
|
|
(td->td_proc->p_leader->p_flag & P_ADVLOCK) != 0) {
|
|
i = 0;
|
|
fpp = fdp->fd_ofiles;
|
|
for (i = 0, fpp = fdp->fd_ofiles;
|
|
i < fdp->fd_lastfile;
|
|
i++, fpp++) {
|
|
if (*fpp == NULL ||
|
|
(*fpp)->f_type != DTYPE_VNODE)
|
|
continue;
|
|
fp = *fpp;
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = fp->f_vnode;
|
|
(void) VOP_ADVLOCK(vp,
|
|
(caddr_t)td->td_proc->
|
|
p_leader,
|
|
F_UNLCK,
|
|
&lf,
|
|
F_POSIX);
|
|
FILEDESC_LOCK(fdp);
|
|
fdrop(fp, td);
|
|
fpp = fdp->fd_ofiles + i;
|
|
}
|
|
}
|
|
retry:
|
|
if (fdtol->fdl_refcount == 1) {
|
|
if (fdp->fd_holdleaderscount > 0 &&
|
|
(td->td_proc->p_leader->p_flag & P_ADVLOCK) != 0) {
|
|
/*
|
|
* close() or do_dup() has cleared a reference
|
|
* in a shared file descriptor table.
|
|
*/
|
|
fdp->fd_holdleaderswakeup = 1;
|
|
msleep(&fdp->fd_holdleaderscount, &fdp->fd_mtx,
|
|
PLOCK, "fdlhold", 0);
|
|
goto retry;
|
|
}
|
|
if (fdtol->fdl_holdcount > 0) {
|
|
/*
|
|
* Ensure that fdtol->fdl_leader
|
|
* remains valid in closef().
|
|
*/
|
|
fdtol->fdl_wakeup = 1;
|
|
msleep(fdtol, &fdp->fd_mtx,
|
|
PLOCK, "fdlhold", 0);
|
|
goto retry;
|
|
}
|
|
}
|
|
fdtol->fdl_refcount--;
|
|
if (fdtol->fdl_refcount == 0 &&
|
|
fdtol->fdl_holdcount == 0) {
|
|
fdtol->fdl_next->fdl_prev = fdtol->fdl_prev;
|
|
fdtol->fdl_prev->fdl_next = fdtol->fdl_next;
|
|
} else
|
|
fdtol = NULL;
|
|
td->td_proc->p_fdtol = NULL;
|
|
FILEDESC_UNLOCK(fdp);
|
|
if (fdtol != NULL)
|
|
FREE(fdtol, M_FILEDESC_TO_LEADER);
|
|
}
|
|
FILEDESC_LOCK(fdp);
|
|
if (--fdp->fd_refcnt > 0) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We are the last reference to the structure, so we can
|
|
* safely assume it will not change out from under us.
|
|
*/
|
|
FILEDESC_UNLOCK(fdp);
|
|
fpp = fdp->fd_ofiles;
|
|
for (i = fdp->fd_lastfile; i-- >= 0; fpp++) {
|
|
if (*fpp)
|
|
(void) closef(*fpp, td);
|
|
}
|
|
|
|
/* XXX This should happen earlier. */
|
|
mtx_lock(&fdesc_mtx);
|
|
td->td_proc->p_fd = NULL;
|
|
mtx_unlock(&fdesc_mtx);
|
|
|
|
if (fdp->fd_nfiles > NDFILE)
|
|
FREE(fdp->fd_ofiles, M_FILEDESC);
|
|
if (fdp->fd_cdir)
|
|
vrele(fdp->fd_cdir);
|
|
if (fdp->fd_rdir)
|
|
vrele(fdp->fd_rdir);
|
|
if (fdp->fd_jdir)
|
|
vrele(fdp->fd_jdir);
|
|
if (fdp->fd_knlist)
|
|
FREE(fdp->fd_knlist, M_KQUEUE);
|
|
if (fdp->fd_knhash)
|
|
FREE(fdp->fd_knhash, M_KQUEUE);
|
|
mtx_destroy(&fdp->fd_mtx);
|
|
FREE(fdp, M_FILEDESC);
|
|
}
|
|
|
|
/*
|
|
* For setugid programs, we don't want to people to use that setugidness
|
|
* to generate error messages which write to a file which otherwise would
|
|
* otherwise be off-limits to the process. We check for filesystems where
|
|
* the vnode can change out from under us after execve (like [lin]procfs).
|
|
*
|
|
* Since setugidsafety calls this only for fd 0, 1 and 2, this check is
|
|
* sufficient. We also don't for check setugidness since we know we are.
|
|
*/
|
|
static int
|
|
is_unsafe(struct file *fp)
|
|
{
|
|
if (fp->f_type == DTYPE_VNODE) {
|
|
struct vnode *vp = fp->f_vnode;
|
|
|
|
if ((vp->v_vflag & VV_PROCDEP) != 0)
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Make this setguid thing safe, if at all possible.
|
|
*/
|
|
void
|
|
setugidsafety(td)
|
|
struct thread *td;
|
|
{
|
|
struct filedesc *fdp;
|
|
int i;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
fdp = td->td_proc->p_fd;
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Note: fdp->fd_ofiles may be reallocated out from under us while
|
|
* we are blocked in a close. Be careful!
|
|
*/
|
|
FILEDESC_LOCK(fdp);
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
if (i > 2)
|
|
break;
|
|
if (fdp->fd_ofiles[i] && is_unsafe(fdp->fd_ofiles[i])) {
|
|
struct file *fp;
|
|
|
|
#if 0
|
|
if ((fdp->fd_ofileflags[i] & UF_MAPPED) != 0)
|
|
(void) munmapfd(td, i);
|
|
#endif
|
|
if (i < fdp->fd_knlistsize) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
knote_fdclose(td, i);
|
|
FILEDESC_LOCK(fdp);
|
|
}
|
|
/*
|
|
* NULL-out descriptor prior to close to avoid
|
|
* a race while close blocks.
|
|
*/
|
|
fp = fdp->fd_ofiles[i];
|
|
fdp->fd_ofiles[i] = NULL;
|
|
fdp->fd_ofileflags[i] = 0;
|
|
if (i < fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
FILEDESC_UNLOCK(fdp);
|
|
(void) closef(fp, td);
|
|
FILEDESC_LOCK(fdp);
|
|
}
|
|
}
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
FILEDESC_UNLOCK(fdp);
|
|
}
|
|
|
|
/*
|
|
* Close any files on exec?
|
|
*/
|
|
void
|
|
fdcloseexec(td)
|
|
struct thread *td;
|
|
{
|
|
struct filedesc *fdp;
|
|
int i;
|
|
|
|
/* Certain daemons might not have file descriptors. */
|
|
fdp = td->td_proc->p_fd;
|
|
if (fdp == NULL)
|
|
return;
|
|
|
|
FILEDESC_LOCK(fdp);
|
|
|
|
/*
|
|
* We cannot cache fd_ofiles or fd_ofileflags since operations
|
|
* may block and rip them out from under us.
|
|
*/
|
|
for (i = 0; i <= fdp->fd_lastfile; i++) {
|
|
if (fdp->fd_ofiles[i] != NULL &&
|
|
(fdp->fd_ofileflags[i] & UF_EXCLOSE)) {
|
|
struct file *fp;
|
|
|
|
#if 0
|
|
if (fdp->fd_ofileflags[i] & UF_MAPPED)
|
|
(void) munmapfd(td, i);
|
|
#endif
|
|
if (i < fdp->fd_knlistsize) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
knote_fdclose(td, i);
|
|
FILEDESC_LOCK(fdp);
|
|
}
|
|
/*
|
|
* NULL-out descriptor prior to close to avoid
|
|
* a race while close blocks.
|
|
*/
|
|
fp = fdp->fd_ofiles[i];
|
|
fdp->fd_ofiles[i] = NULL;
|
|
fdp->fd_ofileflags[i] = 0;
|
|
if (i < fdp->fd_freefile)
|
|
fdp->fd_freefile = i;
|
|
FILEDESC_UNLOCK(fdp);
|
|
(void) closef(fp, td);
|
|
FILEDESC_LOCK(fdp);
|
|
}
|
|
}
|
|
while (fdp->fd_lastfile > 0 && fdp->fd_ofiles[fdp->fd_lastfile] == NULL)
|
|
fdp->fd_lastfile--;
|
|
FILEDESC_UNLOCK(fdp);
|
|
}
|
|
|
|
/*
|
|
* It is unsafe for set[ug]id processes to be started with file
|
|
* descriptors 0..2 closed, as these descriptors are given implicit
|
|
* significance in the Standard C library. fdcheckstd() will create a
|
|
* descriptor referencing /dev/null for each of stdin, stdout, and
|
|
* stderr that is not already open.
|
|
*/
|
|
int
|
|
fdcheckstd(td)
|
|
struct thread *td;
|
|
{
|
|
struct nameidata nd;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
register_t retval;
|
|
int fd, i, error, flags, devnull;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
if (fdp == NULL)
|
|
return (0);
|
|
devnull = -1;
|
|
error = 0;
|
|
for (i = 0; i < 3; i++) {
|
|
if (fdp->fd_ofiles[i] != NULL)
|
|
continue;
|
|
if (devnull < 0) {
|
|
error = falloc(td, &fp, &fd);
|
|
if (error != 0)
|
|
break;
|
|
KASSERT(fd == i, ("oof, we didn't get our fd"));
|
|
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "/dev/null",
|
|
td);
|
|
flags = FREAD | FWRITE;
|
|
error = vn_open(&nd, &flags, 0, -1);
|
|
if (error != 0) {
|
|
FILEDESC_LOCK(fdp);
|
|
fdp->fd_ofiles[fd] = NULL;
|
|
FILEDESC_UNLOCK(fdp);
|
|
fdrop(fp, td);
|
|
break;
|
|
}
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
fp->f_vnode = nd.ni_vp;
|
|
fp->f_data = nd.ni_vp;
|
|
fp->f_flag = flags;
|
|
fp->f_ops = &vnops;
|
|
fp->f_type = DTYPE_VNODE;
|
|
VOP_UNLOCK(nd.ni_vp, 0, td);
|
|
devnull = fd;
|
|
} else {
|
|
error = do_dup(td, DUP_FIXED, devnull, i, &retval);
|
|
if (error != 0)
|
|
break;
|
|
}
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Internal form of close.
|
|
* Decrement reference count on file structure.
|
|
* Note: td may be NULL when closing a file
|
|
* that was being passed in a message.
|
|
*/
|
|
int
|
|
closef(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
struct filedesc_to_leader *fdtol;
|
|
struct filedesc *fdp;
|
|
|
|
if (fp == NULL)
|
|
return (0);
|
|
/*
|
|
* POSIX record locking dictates that any close releases ALL
|
|
* locks owned by this process. This is handled by setting
|
|
* a flag in the unlock to free ONLY locks obeying POSIX
|
|
* semantics, and not to free BSD-style file locks.
|
|
* If the descriptor was in a message, POSIX-style locks
|
|
* aren't passed with the descriptor.
|
|
*/
|
|
if (td != NULL &&
|
|
fp->f_type == DTYPE_VNODE) {
|
|
if ((td->td_proc->p_leader->p_flag & P_ADVLOCK) != 0) {
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = fp->f_vnode;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)td->td_proc->p_leader,
|
|
F_UNLCK, &lf, F_POSIX);
|
|
}
|
|
fdtol = td->td_proc->p_fdtol;
|
|
if (fdtol != NULL) {
|
|
/*
|
|
* Handle special case where file descriptor table
|
|
* is shared between multiple process leaders.
|
|
*/
|
|
fdp = td->td_proc->p_fd;
|
|
FILEDESC_LOCK(fdp);
|
|
for (fdtol = fdtol->fdl_next;
|
|
fdtol != td->td_proc->p_fdtol;
|
|
fdtol = fdtol->fdl_next) {
|
|
if ((fdtol->fdl_leader->p_flag &
|
|
P_ADVLOCK) == 0)
|
|
continue;
|
|
fdtol->fdl_holdcount++;
|
|
FILEDESC_UNLOCK(fdp);
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = fp->f_vnode;
|
|
(void) VOP_ADVLOCK(vp,
|
|
(caddr_t)fdtol->fdl_leader,
|
|
F_UNLCK, &lf, F_POSIX);
|
|
FILEDESC_LOCK(fdp);
|
|
fdtol->fdl_holdcount--;
|
|
if (fdtol->fdl_holdcount == 0 &&
|
|
fdtol->fdl_wakeup != 0) {
|
|
fdtol->fdl_wakeup = 0;
|
|
wakeup(fdtol);
|
|
}
|
|
}
|
|
FILEDESC_UNLOCK(fdp);
|
|
}
|
|
}
|
|
return (fdrop(fp, td));
|
|
}
|
|
|
|
/*
|
|
* Drop reference on struct file passed in, may call closef if the
|
|
* reference hits zero.
|
|
*/
|
|
int
|
|
fdrop(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
|
|
FILE_LOCK(fp);
|
|
return (fdrop_locked(fp, td));
|
|
}
|
|
|
|
/*
|
|
* Extract the file pointer associated with the specified descriptor for
|
|
* the current user process.
|
|
*
|
|
* If the descriptor doesn't exist, EBADF is returned.
|
|
*
|
|
* If the descriptor exists but doesn't match 'flags' then
|
|
* return EBADF for read attempts and EINVAL for write attempts.
|
|
*
|
|
* If 'hold' is set (non-zero) the file's refcount will be bumped on return.
|
|
* It should be droped with fdrop().
|
|
* If it is not set, then the refcount will not be bumped however the
|
|
* thread's filedesc struct will be returned locked (for fgetsock).
|
|
*
|
|
* If an error occured the non-zero error is returned and *fpp is set to NULL.
|
|
* Otherwise *fpp is set and zero is returned.
|
|
*/
|
|
static __inline int
|
|
_fget(struct thread *td, int fd, struct file **fpp, int flags, int hold)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
|
|
*fpp = NULL;
|
|
if (td == NULL || (fdp = td->td_proc->p_fd) == NULL)
|
|
return (EBADF);
|
|
FILEDESC_LOCK(fdp);
|
|
if ((fp = fget_locked(fdp, fd)) == NULL || fp->f_ops == &badfileops) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* Note: FREAD failures returns EBADF to maintain backwards
|
|
* compatibility with what routines returned before.
|
|
*
|
|
* Only one flag, or 0, may be specified.
|
|
*/
|
|
if (flags == FREAD && (fp->f_flag & FREAD) == 0) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
if (flags == FWRITE && (fp->f_flag & FWRITE) == 0) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (EINVAL);
|
|
}
|
|
if (hold) {
|
|
fhold(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
}
|
|
*fpp = fp;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
fget(struct thread *td, int fd, struct file **fpp)
|
|
{
|
|
|
|
return(_fget(td, fd, fpp, 0, 1));
|
|
}
|
|
|
|
int
|
|
fget_read(struct thread *td, int fd, struct file **fpp)
|
|
{
|
|
|
|
return(_fget(td, fd, fpp, FREAD, 1));
|
|
}
|
|
|
|
int
|
|
fget_write(struct thread *td, int fd, struct file **fpp)
|
|
{
|
|
|
|
return(_fget(td, fd, fpp, FWRITE, 1));
|
|
}
|
|
|
|
/*
|
|
* Like fget() but loads the underlying vnode, or returns an error if
|
|
* the descriptor does not represent a vnode. Note that pipes use vnodes
|
|
* but never have VM objects (so VOP_GETVOBJECT() calls will return an
|
|
* error). The returned vnode will be vref()d.
|
|
*/
|
|
static __inline int
|
|
_fgetvp(struct thread *td, int fd, struct vnode **vpp, int flags)
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
*vpp = NULL;
|
|
if ((error = _fget(td, fd, &fp, 0, 0)) != 0)
|
|
return (error);
|
|
if (fp->f_vnode == NULL) {
|
|
error = EINVAL;
|
|
} else {
|
|
*vpp = fp->f_vnode;
|
|
vref(*vpp);
|
|
}
|
|
FILEDESC_UNLOCK(td->td_proc->p_fd);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
fgetvp(struct thread *td, int fd, struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, vpp, 0));
|
|
}
|
|
|
|
int
|
|
fgetvp_read(struct thread *td, int fd, struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, vpp, FREAD));
|
|
}
|
|
|
|
int
|
|
fgetvp_write(struct thread *td, int fd, struct vnode **vpp)
|
|
{
|
|
|
|
return (_fgetvp(td, fd, vpp, FWRITE));
|
|
}
|
|
|
|
/*
|
|
* Like fget() but loads the underlying socket, or returns an error if
|
|
* the descriptor does not represent a socket.
|
|
*
|
|
* We bump the ref count on the returned socket. XXX Also obtain the SX
|
|
* lock in the future.
|
|
*/
|
|
int
|
|
fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp)
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
*spp = NULL;
|
|
if (fflagp != NULL)
|
|
*fflagp = 0;
|
|
if ((error = _fget(td, fd, &fp, 0, 0)) != 0)
|
|
return (error);
|
|
if (fp->f_type != DTYPE_SOCKET) {
|
|
error = ENOTSOCK;
|
|
} else {
|
|
*spp = fp->f_data;
|
|
if (fflagp)
|
|
*fflagp = fp->f_flag;
|
|
soref(*spp);
|
|
}
|
|
FILEDESC_UNLOCK(td->td_proc->p_fd);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Drop the reference count on the the socket and XXX release the SX lock in
|
|
* the future. The last reference closes the socket.
|
|
*/
|
|
void
|
|
fputsock(struct socket *so)
|
|
{
|
|
|
|
sorele(so);
|
|
}
|
|
|
|
/*
|
|
* Drop reference on struct file passed in, may call closef if the
|
|
* reference hits zero.
|
|
* Expects struct file locked, and will unlock it.
|
|
*/
|
|
int
|
|
fdrop_locked(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
struct flock lf;
|
|
struct vnode *vp;
|
|
int error;
|
|
|
|
FILE_LOCK_ASSERT(fp, MA_OWNED);
|
|
|
|
if (--fp->f_count > 0) {
|
|
FILE_UNLOCK(fp);
|
|
return (0);
|
|
}
|
|
/* We have the last ref so we can proceed without the file lock. */
|
|
FILE_UNLOCK(fp);
|
|
mtx_lock(&Giant);
|
|
if (fp->f_count < 0)
|
|
panic("fdrop: count < 0");
|
|
if ((fp->f_flag & FHASLOCK) && fp->f_type == DTYPE_VNODE) {
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
lf.l_type = F_UNLCK;
|
|
vp = fp->f_vnode;
|
|
(void) VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
|
|
}
|
|
if (fp->f_ops != &badfileops)
|
|
error = fo_close(fp, td);
|
|
else
|
|
error = 0;
|
|
ffree(fp);
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Apply an advisory lock on a file descriptor.
|
|
*
|
|
* Just attempt to get a record lock of the requested type on
|
|
* the entire file (l_whence = SEEK_SET, l_start = 0, l_len = 0).
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct flock_args {
|
|
int fd;
|
|
int how;
|
|
};
|
|
#endif
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
flock(td, uap)
|
|
struct thread *td;
|
|
struct flock_args *uap;
|
|
{
|
|
struct file *fp;
|
|
struct vnode *vp;
|
|
struct flock lf;
|
|
int error;
|
|
|
|
if ((error = fget(td, uap->fd, &fp)) != 0)
|
|
return (error);
|
|
if (fp->f_type != DTYPE_VNODE) {
|
|
fdrop(fp, td);
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
mtx_lock(&Giant);
|
|
vp = fp->f_vnode;
|
|
lf.l_whence = SEEK_SET;
|
|
lf.l_start = 0;
|
|
lf.l_len = 0;
|
|
if (uap->how & LOCK_UN) {
|
|
lf.l_type = F_UNLCK;
|
|
FILE_LOCK(fp);
|
|
fp->f_flag &= ~FHASLOCK;
|
|
FILE_UNLOCK(fp);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_UNLCK, &lf, F_FLOCK);
|
|
goto done2;
|
|
}
|
|
if (uap->how & LOCK_EX)
|
|
lf.l_type = F_WRLCK;
|
|
else if (uap->how & LOCK_SH)
|
|
lf.l_type = F_RDLCK;
|
|
else {
|
|
error = EBADF;
|
|
goto done2;
|
|
}
|
|
FILE_LOCK(fp);
|
|
fp->f_flag |= FHASLOCK;
|
|
FILE_UNLOCK(fp);
|
|
error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf,
|
|
(uap->how & LOCK_NB) ? F_FLOCK : F_FLOCK | F_WAIT);
|
|
done2:
|
|
fdrop(fp, td);
|
|
mtx_unlock(&Giant);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* File Descriptor pseudo-device driver (/dev/fd/).
|
|
*
|
|
* Opening minor device N dup()s the file (if any) connected to file
|
|
* descriptor N belonging to the calling process. Note that this driver
|
|
* consists of only the ``open()'' routine, because all subsequent
|
|
* references to this file will be direct to the other driver.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
fdopen(dev, mode, type, td)
|
|
dev_t dev;
|
|
int mode, type;
|
|
struct thread *td;
|
|
{
|
|
|
|
/*
|
|
* XXX Kludge: set curthread->td_dupfd to contain the value of the
|
|
* the file descriptor being sought for duplication. The error
|
|
* return ensures that the vnode for this device will be released
|
|
* by vn_open. Open will detect this special error and take the
|
|
* actions in dupfdopen below. Other callers of vn_open or VOP_OPEN
|
|
* will simply report the error.
|
|
*/
|
|
td->td_dupfd = dev2unit(dev);
|
|
return (ENODEV);
|
|
}
|
|
|
|
/*
|
|
* Duplicate the specified descriptor to a free descriptor.
|
|
*/
|
|
int
|
|
dupfdopen(td, fdp, indx, dfd, mode, error)
|
|
struct thread *td;
|
|
struct filedesc *fdp;
|
|
int indx, dfd;
|
|
int mode;
|
|
int error;
|
|
{
|
|
struct file *wfp;
|
|
struct file *fp;
|
|
|
|
/*
|
|
* If the to-be-dup'd fd number is greater than the allowed number
|
|
* of file descriptors, or the fd to be dup'd has already been
|
|
* closed, then reject.
|
|
*/
|
|
FILEDESC_LOCK(fdp);
|
|
if (dfd < 0 || dfd >= fdp->fd_nfiles ||
|
|
(wfp = fdp->fd_ofiles[dfd]) == NULL) {
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (EBADF);
|
|
}
|
|
|
|
/*
|
|
* There are two cases of interest here.
|
|
*
|
|
* For ENODEV simply dup (dfd) to file descriptor
|
|
* (indx) and return.
|
|
*
|
|
* For ENXIO steal away the file structure from (dfd) and
|
|
* store it in (indx). (dfd) is effectively closed by
|
|
* this operation.
|
|
*
|
|
* Any other error code is just returned.
|
|
*/
|
|
switch (error) {
|
|
case ENODEV:
|
|
/*
|
|
* Check that the mode the file is being opened for is a
|
|
* subset of the mode of the existing descriptor.
|
|
*/
|
|
FILE_LOCK(wfp);
|
|
if (((mode & (FREAD|FWRITE)) | wfp->f_flag) != wfp->f_flag) {
|
|
FILE_UNLOCK(wfp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (EACCES);
|
|
}
|
|
fp = fdp->fd_ofiles[indx];
|
|
#if 0
|
|
if (fp && fdp->fd_ofileflags[indx] & UF_MAPPED)
|
|
(void) munmapfd(td, indx);
|
|
#endif
|
|
fdp->fd_ofiles[indx] = wfp;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
fhold_locked(wfp);
|
|
FILE_UNLOCK(wfp);
|
|
if (indx > fdp->fd_lastfile)
|
|
fdp->fd_lastfile = indx;
|
|
if (fp != NULL)
|
|
FILE_LOCK(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
/*
|
|
* We now own the reference to fp that the ofiles[] array
|
|
* used to own. Release it.
|
|
*/
|
|
if (fp != NULL)
|
|
fdrop_locked(fp, td);
|
|
return (0);
|
|
|
|
case ENXIO:
|
|
/*
|
|
* Steal away the file pointer from dfd and stuff it into indx.
|
|
*/
|
|
fp = fdp->fd_ofiles[indx];
|
|
#if 0
|
|
if (fp && fdp->fd_ofileflags[indx] & UF_MAPPED)
|
|
(void) munmapfd(td, indx);
|
|
#endif
|
|
fdp->fd_ofiles[indx] = fdp->fd_ofiles[dfd];
|
|
fdp->fd_ofiles[dfd] = NULL;
|
|
fdp->fd_ofileflags[indx] = fdp->fd_ofileflags[dfd];
|
|
fdp->fd_ofileflags[dfd] = 0;
|
|
|
|
/*
|
|
* Complete the clean up of the filedesc structure by
|
|
* recomputing the various hints.
|
|
*/
|
|
if (indx > fdp->fd_lastfile) {
|
|
fdp->fd_lastfile = indx;
|
|
} else {
|
|
while (fdp->fd_lastfile > 0 &&
|
|
fdp->fd_ofiles[fdp->fd_lastfile] == NULL) {
|
|
fdp->fd_lastfile--;
|
|
}
|
|
if (dfd < fdp->fd_freefile)
|
|
fdp->fd_freefile = dfd;
|
|
}
|
|
if (fp != NULL)
|
|
FILE_LOCK(fp);
|
|
FILEDESC_UNLOCK(fdp);
|
|
|
|
/*
|
|
* we now own the reference to fp that the ofiles[] array
|
|
* used to own. Release it.
|
|
*/
|
|
if (fp != NULL)
|
|
fdrop_locked(fp, td);
|
|
return (0);
|
|
|
|
default:
|
|
FILEDESC_UNLOCK(fdp);
|
|
return (error);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
struct filedesc_to_leader *
|
|
filedesc_to_leader_alloc(struct filedesc_to_leader *old,
|
|
struct filedesc *fdp,
|
|
struct proc *leader)
|
|
{
|
|
struct filedesc_to_leader *fdtol;
|
|
|
|
MALLOC(fdtol, struct filedesc_to_leader *,
|
|
sizeof(struct filedesc_to_leader),
|
|
M_FILEDESC_TO_LEADER,
|
|
M_WAITOK);
|
|
fdtol->fdl_refcount = 1;
|
|
fdtol->fdl_holdcount = 0;
|
|
fdtol->fdl_wakeup = 0;
|
|
fdtol->fdl_leader = leader;
|
|
if (old != NULL) {
|
|
FILEDESC_LOCK(fdp);
|
|
fdtol->fdl_next = old->fdl_next;
|
|
fdtol->fdl_prev = old;
|
|
old->fdl_next = fdtol;
|
|
fdtol->fdl_next->fdl_prev = fdtol;
|
|
FILEDESC_UNLOCK(fdp);
|
|
} else {
|
|
fdtol->fdl_next = fdtol;
|
|
fdtol->fdl_prev = fdtol;
|
|
}
|
|
return fdtol;
|
|
}
|
|
|
|
/*
|
|
* Get file structures.
|
|
*/
|
|
static int
|
|
sysctl_kern_file(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct xfile xf;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct proc *p;
|
|
int error, n;
|
|
|
|
/*
|
|
* Note: because the number of file descriptors is calculated
|
|
* in different ways for sizing vs returning the data,
|
|
* there is information leakage from the first loop. However,
|
|
* it is of a similar order of magnitude to the leakage from
|
|
* global system statistics such as kern.openfiles.
|
|
*/
|
|
sysctl_wire_old_buffer(req, 0);
|
|
if (req->oldptr == NULL) {
|
|
n = 16; /* A slight overestimate. */
|
|
sx_slock(&filelist_lock);
|
|
LIST_FOREACH(fp, &filehead, f_list) {
|
|
/*
|
|
* We should grab the lock, but this is an
|
|
* estimate, so does it really matter?
|
|
*/
|
|
/* mtx_lock(fp->f_mtxp); */
|
|
n += fp->f_count;
|
|
/* mtx_unlock(f->f_mtxp); */
|
|
}
|
|
sx_sunlock(&filelist_lock);
|
|
return (SYSCTL_OUT(req, 0, n * sizeof(xf)));
|
|
}
|
|
error = 0;
|
|
bzero(&xf, sizeof(xf));
|
|
xf.xf_size = sizeof(xf);
|
|
sx_slock(&allproc_lock);
|
|
LIST_FOREACH(p, &allproc, p_list) {
|
|
PROC_LOCK(p);
|
|
if (p_cansee(req->td, p) != 0) {
|
|
PROC_UNLOCK(p);
|
|
continue;
|
|
}
|
|
xf.xf_pid = p->p_pid;
|
|
xf.xf_uid = p->p_ucred->cr_uid;
|
|
PROC_UNLOCK(p);
|
|
mtx_lock(&fdesc_mtx);
|
|
if ((fdp = p->p_fd) == NULL) {
|
|
mtx_unlock(&fdesc_mtx);
|
|
continue;
|
|
}
|
|
FILEDESC_LOCK(fdp);
|
|
for (n = 0; n < fdp->fd_nfiles; ++n) {
|
|
if ((fp = fdp->fd_ofiles[n]) == NULL)
|
|
continue;
|
|
xf.xf_fd = n;
|
|
xf.xf_file = fp;
|
|
xf.xf_data = fp->f_data;
|
|
xf.xf_type = fp->f_type;
|
|
xf.xf_count = fp->f_count;
|
|
xf.xf_msgcount = fp->f_msgcount;
|
|
xf.xf_offset = fp->f_offset;
|
|
xf.xf_flag = fp->f_flag;
|
|
error = SYSCTL_OUT(req, &xf, sizeof(xf));
|
|
if (error)
|
|
break;
|
|
}
|
|
FILEDESC_UNLOCK(fdp);
|
|
mtx_unlock(&fdesc_mtx);
|
|
if (error)
|
|
break;
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, KERN_FILE, file, CTLTYPE_OPAQUE|CTLFLAG_RD,
|
|
0, 0, sysctl_kern_file, "S,xfile", "Entire file table");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILESPERPROC, maxfilesperproc, CTLFLAG_RW,
|
|
&maxfilesperproc, 0, "Maximum files allowed open per process");
|
|
|
|
SYSCTL_INT(_kern, KERN_MAXFILES, maxfiles, CTLFLAG_RW,
|
|
&maxfiles, 0, "Maximum number of files");
|
|
|
|
SYSCTL_INT(_kern, OID_AUTO, openfiles, CTLFLAG_RD,
|
|
&nfiles, 0, "System-wide number of open files");
|
|
|
|
static void
|
|
fildesc_drvinit(void *unused)
|
|
{
|
|
dev_t dev;
|
|
|
|
dev = make_dev(&fildesc_cdevsw, 0, UID_ROOT, GID_WHEEL, 0666, "fd/0");
|
|
make_dev_alias(dev, "stdin");
|
|
dev = make_dev(&fildesc_cdevsw, 1, UID_ROOT, GID_WHEEL, 0666, "fd/1");
|
|
make_dev_alias(dev, "stdout");
|
|
dev = make_dev(&fildesc_cdevsw, 2, UID_ROOT, GID_WHEEL, 0666, "fd/2");
|
|
make_dev_alias(dev, "stderr");
|
|
}
|
|
|
|
static fo_rdwr_t badfo_readwrite;
|
|
static fo_ioctl_t badfo_ioctl;
|
|
static fo_poll_t badfo_poll;
|
|
static fo_kqfilter_t badfo_kqfilter;
|
|
static fo_stat_t badfo_stat;
|
|
static fo_close_t badfo_close;
|
|
|
|
struct fileops badfileops = {
|
|
.fo_read = badfo_readwrite,
|
|
.fo_write = badfo_readwrite,
|
|
.fo_ioctl = badfo_ioctl,
|
|
.fo_poll = badfo_poll,
|
|
.fo_kqfilter = badfo_kqfilter,
|
|
.fo_stat = badfo_stat,
|
|
.fo_close = badfo_close,
|
|
};
|
|
|
|
static int
|
|
badfo_readwrite(fp, uio, active_cred, flags, td)
|
|
struct file *fp;
|
|
struct uio *uio;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
int flags;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_ioctl(fp, com, data, active_cred, td)
|
|
struct file *fp;
|
|
u_long com;
|
|
void *data;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_poll(fp, events, active_cred, td)
|
|
struct file *fp;
|
|
int events;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
badfo_kqfilter(fp, kn)
|
|
struct file *fp;
|
|
struct knote *kn;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
badfo_stat(fp, sb, active_cred, td)
|
|
struct file *fp;
|
|
struct stat *sb;
|
|
struct ucred *active_cred;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
static int
|
|
badfo_close(fp, td)
|
|
struct file *fp;
|
|
struct thread *td;
|
|
{
|
|
|
|
return (EBADF);
|
|
}
|
|
|
|
SYSINIT(fildescdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,
|
|
fildesc_drvinit,NULL)
|
|
|
|
static void filelistinit(void *);
|
|
SYSINIT(select, SI_SUB_LOCK, SI_ORDER_FIRST, filelistinit, NULL)
|
|
|
|
/* ARGSUSED*/
|
|
static void
|
|
filelistinit(dummy)
|
|
void *dummy;
|
|
{
|
|
|
|
file_zone = uma_zcreate("Files", sizeof(struct file), NULL, NULL,
|
|
NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
sx_init(&filelist_lock, "filelist lock");
|
|
mtx_init(&sigio_lock, "sigio lock", NULL, MTX_DEF);
|
|
}
|