99851f359e
patch modifies makesyscalls.sh to prefix all of the non-compatibility calls (e.g. not linux_, freebsd32_) with sys_ and updates the kernel entry points and all places in the code that use them. It also fixes an additional name space collision between the kernel function psignal and the libc function of the same name by renaming the kernel psignal kern_psignal(). By introducing this change now we will ease future MFCs that change syscalls. Reviewed by: rwatson Approved by: re (bz)
1701 lines
36 KiB
C
1701 lines
36 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 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
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* to the University of California by American Telephone and Telegraph
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* 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
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* documentation and/or other materials provided with the distribution.
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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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*
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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
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* 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
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* 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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* @(#)sys_generic.c 8.5 (Berkeley) 1/21/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_capsicum.h"
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#include "opt_compat.h"
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#include "opt_ktrace.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/capability.h>
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#include <sys/filedesc.h>
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#include <sys/filio.h>
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#include <sys/fcntl.h>
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#include <sys/file.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/socketvar.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/poll.h>
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#include <sys/resourcevar.h>
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#include <sys/selinfo.h>
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#include <sys/sleepqueue.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/condvar.h>
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#ifdef KTRACE
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#include <sys/ktrace.h>
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#endif
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#include <security/audit/audit.h>
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static MALLOC_DEFINE(M_IOCTLOPS, "ioctlops", "ioctl data buffer");
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static MALLOC_DEFINE(M_SELECT, "select", "select() buffer");
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MALLOC_DEFINE(M_IOV, "iov", "large iov's");
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static int pollout(struct thread *, struct pollfd *, struct pollfd *,
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u_int);
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static int pollscan(struct thread *, struct pollfd *, u_int);
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static int pollrescan(struct thread *);
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static int selscan(struct thread *, fd_mask **, fd_mask **, int);
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static int selrescan(struct thread *, fd_mask **, fd_mask **);
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static void selfdalloc(struct thread *, void *);
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static void selfdfree(struct seltd *, struct selfd *);
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static int dofileread(struct thread *, int, struct file *, struct uio *,
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off_t, int);
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static int dofilewrite(struct thread *, int, struct file *, struct uio *,
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off_t, int);
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static void doselwakeup(struct selinfo *, int);
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static void seltdinit(struct thread *);
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static int seltdwait(struct thread *, int);
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static void seltdclear(struct thread *);
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/*
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* One seltd per-thread allocated on demand as needed.
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*
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* t - protected by st_mtx
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* k - Only accessed by curthread or read-only
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*/
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struct seltd {
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STAILQ_HEAD(, selfd) st_selq; /* (k) List of selfds. */
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struct selfd *st_free1; /* (k) free fd for read set. */
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struct selfd *st_free2; /* (k) free fd for write set. */
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struct mtx st_mtx; /* Protects struct seltd */
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struct cv st_wait; /* (t) Wait channel. */
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int st_flags; /* (t) SELTD_ flags. */
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};
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#define SELTD_PENDING 0x0001 /* We have pending events. */
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#define SELTD_RESCAN 0x0002 /* Doing a rescan. */
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/*
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* One selfd allocated per-thread per-file-descriptor.
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* f - protected by sf_mtx
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*/
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struct selfd {
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STAILQ_ENTRY(selfd) sf_link; /* (k) fds owned by this td. */
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TAILQ_ENTRY(selfd) sf_threads; /* (f) fds on this selinfo. */
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struct selinfo *sf_si; /* (f) selinfo when linked. */
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struct mtx *sf_mtx; /* Pointer to selinfo mtx. */
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struct seltd *sf_td; /* (k) owning seltd. */
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void *sf_cookie; /* (k) fd or pollfd. */
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};
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static uma_zone_t selfd_zone;
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static struct mtx_pool *mtxpool_select;
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#ifndef _SYS_SYSPROTO_H_
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struct read_args {
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int fd;
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void *buf;
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size_t nbyte;
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};
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#endif
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int
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sys_read(td, uap)
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struct thread *td;
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struct read_args *uap;
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{
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struct uio auio;
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struct iovec aiov;
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int error;
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if (uap->nbyte > INT_MAX)
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return (EINVAL);
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aiov.iov_base = uap->buf;
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aiov.iov_len = uap->nbyte;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_resid = uap->nbyte;
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auio.uio_segflg = UIO_USERSPACE;
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error = kern_readv(td, uap->fd, &auio);
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return(error);
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}
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/*
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* Positioned read system call
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct pread_args {
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int fd;
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void *buf;
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size_t nbyte;
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int pad;
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off_t offset;
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};
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#endif
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int
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sys_pread(td, uap)
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struct thread *td;
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struct pread_args *uap;
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{
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struct uio auio;
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struct iovec aiov;
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int error;
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if (uap->nbyte > INT_MAX)
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return (EINVAL);
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aiov.iov_base = uap->buf;
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aiov.iov_len = uap->nbyte;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_resid = uap->nbyte;
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auio.uio_segflg = UIO_USERSPACE;
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error = kern_preadv(td, uap->fd, &auio, uap->offset);
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return(error);
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}
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int
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freebsd6_pread(td, uap)
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struct thread *td;
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struct freebsd6_pread_args *uap;
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{
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struct pread_args oargs;
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oargs.fd = uap->fd;
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oargs.buf = uap->buf;
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oargs.nbyte = uap->nbyte;
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oargs.offset = uap->offset;
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return (sys_pread(td, &oargs));
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}
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/*
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* Scatter read system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct readv_args {
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int fd;
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struct iovec *iovp;
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u_int iovcnt;
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};
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#endif
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int
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sys_readv(struct thread *td, struct readv_args *uap)
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{
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struct uio *auio;
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int error;
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error = copyinuio(uap->iovp, uap->iovcnt, &auio);
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if (error)
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return (error);
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error = kern_readv(td, uap->fd, auio);
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free(auio, M_IOV);
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return (error);
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}
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int
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kern_readv(struct thread *td, int fd, struct uio *auio)
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{
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struct file *fp;
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int error;
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error = fget_read(td, fd, CAP_READ | CAP_SEEK, &fp);
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if (error)
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return (error);
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error = dofileread(td, fd, fp, auio, (off_t)-1, 0);
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fdrop(fp, td);
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return (error);
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}
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/*
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* Scatter positioned read system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct preadv_args {
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int fd;
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struct iovec *iovp;
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u_int iovcnt;
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off_t offset;
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};
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#endif
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int
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sys_preadv(struct thread *td, struct preadv_args *uap)
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{
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struct uio *auio;
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int error;
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error = copyinuio(uap->iovp, uap->iovcnt, &auio);
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if (error)
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return (error);
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error = kern_preadv(td, uap->fd, auio, uap->offset);
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free(auio, M_IOV);
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return (error);
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}
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int
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kern_preadv(td, fd, auio, offset)
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struct thread *td;
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int fd;
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struct uio *auio;
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off_t offset;
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{
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struct file *fp;
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int error;
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error = fget_read(td, fd, CAP_READ, &fp);
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if (error)
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return (error);
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if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE))
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error = ESPIPE;
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else if (offset < 0 && fp->f_vnode->v_type != VCHR)
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error = EINVAL;
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else
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error = dofileread(td, fd, fp, auio, offset, FOF_OFFSET);
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fdrop(fp, td);
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return (error);
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}
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/*
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* Common code for readv and preadv that reads data in
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* from a file using the passed in uio, offset, and flags.
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*/
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static int
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dofileread(td, fd, fp, auio, offset, flags)
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struct thread *td;
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int fd;
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struct file *fp;
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struct uio *auio;
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off_t offset;
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int flags;
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{
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ssize_t cnt;
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int error;
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#ifdef KTRACE
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struct uio *ktruio = NULL;
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#endif
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/* Finish zero length reads right here */
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if (auio->uio_resid == 0) {
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td->td_retval[0] = 0;
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return(0);
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}
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auio->uio_rw = UIO_READ;
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auio->uio_offset = offset;
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auio->uio_td = td;
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_GENIO))
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ktruio = cloneuio(auio);
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#endif
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cnt = auio->uio_resid;
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if ((error = fo_read(fp, auio, td->td_ucred, flags, td))) {
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if (auio->uio_resid != cnt && (error == ERESTART ||
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error == EINTR || error == EWOULDBLOCK))
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error = 0;
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}
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cnt -= auio->uio_resid;
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#ifdef KTRACE
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if (ktruio != NULL) {
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ktruio->uio_resid = cnt;
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ktrgenio(fd, UIO_READ, ktruio, error);
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}
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#endif
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td->td_retval[0] = cnt;
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return (error);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct write_args {
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int fd;
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const void *buf;
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size_t nbyte;
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};
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#endif
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int
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sys_write(td, uap)
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struct thread *td;
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struct write_args *uap;
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{
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struct uio auio;
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struct iovec aiov;
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int error;
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if (uap->nbyte > INT_MAX)
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return (EINVAL);
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aiov.iov_base = (void *)(uintptr_t)uap->buf;
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aiov.iov_len = uap->nbyte;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_resid = uap->nbyte;
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auio.uio_segflg = UIO_USERSPACE;
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error = kern_writev(td, uap->fd, &auio);
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return(error);
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}
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|
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/*
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* Positioned write system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct pwrite_args {
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int fd;
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const void *buf;
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size_t nbyte;
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int pad;
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off_t offset;
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};
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#endif
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int
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sys_pwrite(td, uap)
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struct thread *td;
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struct pwrite_args *uap;
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{
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struct uio auio;
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struct iovec aiov;
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int error;
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if (uap->nbyte > INT_MAX)
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return (EINVAL);
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aiov.iov_base = (void *)(uintptr_t)uap->buf;
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aiov.iov_len = uap->nbyte;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_resid = uap->nbyte;
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auio.uio_segflg = UIO_USERSPACE;
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error = kern_pwritev(td, uap->fd, &auio, uap->offset);
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return(error);
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}
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|
|
int
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freebsd6_pwrite(td, uap)
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struct thread *td;
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struct freebsd6_pwrite_args *uap;
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{
|
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struct pwrite_args oargs;
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oargs.fd = uap->fd;
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oargs.buf = uap->buf;
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oargs.nbyte = uap->nbyte;
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oargs.offset = uap->offset;
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return (sys_pwrite(td, &oargs));
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}
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|
|
/*
|
|
* Gather write system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct writev_args {
|
|
int fd;
|
|
struct iovec *iovp;
|
|
u_int iovcnt;
|
|
};
|
|
#endif
|
|
int
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|
sys_writev(struct thread *td, struct writev_args *uap)
|
|
{
|
|
struct uio *auio;
|
|
int error;
|
|
|
|
error = copyinuio(uap->iovp, uap->iovcnt, &auio);
|
|
if (error)
|
|
return (error);
|
|
error = kern_writev(td, uap->fd, auio);
|
|
free(auio, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_writev(struct thread *td, int fd, struct uio *auio)
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
error = fget_write(td, fd, CAP_WRITE | CAP_SEEK, &fp);
|
|
if (error)
|
|
return (error);
|
|
error = dofilewrite(td, fd, fp, auio, (off_t)-1, 0);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Gather positioned write system call.
|
|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct pwritev_args {
|
|
int fd;
|
|
struct iovec *iovp;
|
|
u_int iovcnt;
|
|
off_t offset;
|
|
};
|
|
#endif
|
|
int
|
|
sys_pwritev(struct thread *td, struct pwritev_args *uap)
|
|
{
|
|
struct uio *auio;
|
|
int error;
|
|
|
|
error = copyinuio(uap->iovp, uap->iovcnt, &auio);
|
|
if (error)
|
|
return (error);
|
|
error = kern_pwritev(td, uap->fd, auio, uap->offset);
|
|
free(auio, M_IOV);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_pwritev(td, fd, auio, offset)
|
|
struct thread *td;
|
|
struct uio *auio;
|
|
int fd;
|
|
off_t offset;
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
error = fget_write(td, fd, CAP_WRITE, &fp);
|
|
if (error)
|
|
return (error);
|
|
if (!(fp->f_ops->fo_flags & DFLAG_SEEKABLE))
|
|
error = ESPIPE;
|
|
else if (offset < 0 && fp->f_vnode->v_type != VCHR)
|
|
error = EINVAL;
|
|
else
|
|
error = dofilewrite(td, fd, fp, auio, offset, FOF_OFFSET);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Common code for writev and pwritev that writes data to
|
|
* a file using the passed in uio, offset, and flags.
|
|
*/
|
|
static int
|
|
dofilewrite(td, fd, fp, auio, offset, flags)
|
|
struct thread *td;
|
|
int fd;
|
|
struct file *fp;
|
|
struct uio *auio;
|
|
off_t offset;
|
|
int flags;
|
|
{
|
|
ssize_t cnt;
|
|
int error;
|
|
#ifdef KTRACE
|
|
struct uio *ktruio = NULL;
|
|
#endif
|
|
|
|
auio->uio_rw = UIO_WRITE;
|
|
auio->uio_td = td;
|
|
auio->uio_offset = offset;
|
|
#ifdef KTRACE
|
|
if (KTRPOINT(td, KTR_GENIO))
|
|
ktruio = cloneuio(auio);
|
|
#endif
|
|
cnt = auio->uio_resid;
|
|
if (fp->f_type == DTYPE_VNODE)
|
|
bwillwrite();
|
|
if ((error = fo_write(fp, auio, td->td_ucred, flags, td))) {
|
|
if (auio->uio_resid != cnt && (error == ERESTART ||
|
|
error == EINTR || error == EWOULDBLOCK))
|
|
error = 0;
|
|
/* Socket layer is responsible for issuing SIGPIPE. */
|
|
if (fp->f_type != DTYPE_SOCKET && error == EPIPE) {
|
|
PROC_LOCK(td->td_proc);
|
|
tdsignal(td, SIGPIPE);
|
|
PROC_UNLOCK(td->td_proc);
|
|
}
|
|
}
|
|
cnt -= auio->uio_resid;
|
|
#ifdef KTRACE
|
|
if (ktruio != NULL) {
|
|
ktruio->uio_resid = cnt;
|
|
ktrgenio(fd, UIO_WRITE, ktruio, error);
|
|
}
|
|
#endif
|
|
td->td_retval[0] = cnt;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Truncate a file given a file descriptor.
|
|
*
|
|
* Can't use fget_write() here, since must return EINVAL and not EBADF if the
|
|
* descriptor isn't writable.
|
|
*/
|
|
int
|
|
kern_ftruncate(td, fd, length)
|
|
struct thread *td;
|
|
int fd;
|
|
off_t length;
|
|
{
|
|
struct file *fp;
|
|
int error;
|
|
|
|
AUDIT_ARG_FD(fd);
|
|
if (length < 0)
|
|
return (EINVAL);
|
|
error = fget(td, fd, CAP_FTRUNCATE, &fp);
|
|
if (error)
|
|
return (error);
|
|
AUDIT_ARG_FILE(td->td_proc, fp);
|
|
if (!(fp->f_flag & FWRITE)) {
|
|
fdrop(fp, td);
|
|
return (EINVAL);
|
|
}
|
|
error = fo_truncate(fp, length, td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ftruncate_args {
|
|
int fd;
|
|
int pad;
|
|
off_t length;
|
|
};
|
|
#endif
|
|
int
|
|
sys_ftruncate(td, uap)
|
|
struct thread *td;
|
|
struct ftruncate_args *uap;
|
|
{
|
|
|
|
return (kern_ftruncate(td, uap->fd, uap->length));
|
|
}
|
|
|
|
#if defined(COMPAT_43)
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct oftruncate_args {
|
|
int fd;
|
|
long length;
|
|
};
|
|
#endif
|
|
int
|
|
oftruncate(td, uap)
|
|
struct thread *td;
|
|
struct oftruncate_args *uap;
|
|
{
|
|
|
|
return (kern_ftruncate(td, uap->fd, uap->length));
|
|
}
|
|
#endif /* COMPAT_43 */
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ioctl_args {
|
|
int fd;
|
|
u_long com;
|
|
caddr_t data;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
sys_ioctl(struct thread *td, struct ioctl_args *uap)
|
|
{
|
|
u_long com;
|
|
int arg, error;
|
|
u_int size;
|
|
caddr_t data;
|
|
|
|
if (uap->com > 0xffffffff) {
|
|
printf(
|
|
"WARNING pid %d (%s): ioctl sign-extension ioctl %lx\n",
|
|
td->td_proc->p_pid, td->td_name, uap->com);
|
|
uap->com &= 0xffffffff;
|
|
}
|
|
com = uap->com;
|
|
|
|
/*
|
|
* Interpret high order word to find amount of data to be
|
|
* copied to/from the user's address space.
|
|
*/
|
|
size = IOCPARM_LEN(com);
|
|
if ((size > IOCPARM_MAX) ||
|
|
((com & (IOC_VOID | IOC_IN | IOC_OUT)) == 0) ||
|
|
#if defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD4) || defined(COMPAT_43)
|
|
((com & IOC_OUT) && size == 0) ||
|
|
#else
|
|
((com & (IOC_IN | IOC_OUT)) && size == 0) ||
|
|
#endif
|
|
((com & IOC_VOID) && size > 0 && size != sizeof(int)))
|
|
return (ENOTTY);
|
|
|
|
if (size > 0) {
|
|
if (com & IOC_VOID) {
|
|
/* Integer argument. */
|
|
arg = (intptr_t)uap->data;
|
|
data = (void *)&arg;
|
|
size = 0;
|
|
} else
|
|
data = malloc((u_long)size, M_IOCTLOPS, M_WAITOK);
|
|
} else
|
|
data = (void *)&uap->data;
|
|
if (com & IOC_IN) {
|
|
error = copyin(uap->data, data, (u_int)size);
|
|
if (error) {
|
|
if (size > 0)
|
|
free(data, M_IOCTLOPS);
|
|
return (error);
|
|
}
|
|
} else if (com & IOC_OUT) {
|
|
/*
|
|
* Zero the buffer so the user always
|
|
* gets back something deterministic.
|
|
*/
|
|
bzero(data, size);
|
|
}
|
|
|
|
error = kern_ioctl(td, uap->fd, com, data);
|
|
|
|
if (error == 0 && (com & IOC_OUT))
|
|
error = copyout(data, uap->data, (u_int)size);
|
|
|
|
if (size > 0)
|
|
free(data, M_IOCTLOPS);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_ioctl(struct thread *td, int fd, u_long com, caddr_t data)
|
|
{
|
|
struct file *fp;
|
|
struct filedesc *fdp;
|
|
int error;
|
|
int tmp;
|
|
|
|
AUDIT_ARG_FD(fd);
|
|
AUDIT_ARG_CMD(com);
|
|
if ((error = fget(td, fd, CAP_IOCTL, &fp)) != 0)
|
|
return (error);
|
|
if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
|
|
fdrop(fp, td);
|
|
return (EBADF);
|
|
}
|
|
fdp = td->td_proc->p_fd;
|
|
switch (com) {
|
|
case FIONCLEX:
|
|
FILEDESC_XLOCK(fdp);
|
|
fdp->fd_ofileflags[fd] &= ~UF_EXCLOSE;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
goto out;
|
|
case FIOCLEX:
|
|
FILEDESC_XLOCK(fdp);
|
|
fdp->fd_ofileflags[fd] |= UF_EXCLOSE;
|
|
FILEDESC_XUNLOCK(fdp);
|
|
goto out;
|
|
case FIONBIO:
|
|
if ((tmp = *(int *)data))
|
|
atomic_set_int(&fp->f_flag, FNONBLOCK);
|
|
else
|
|
atomic_clear_int(&fp->f_flag, FNONBLOCK);
|
|
data = (void *)&tmp;
|
|
break;
|
|
case FIOASYNC:
|
|
if ((tmp = *(int *)data))
|
|
atomic_set_int(&fp->f_flag, FASYNC);
|
|
else
|
|
atomic_clear_int(&fp->f_flag, FASYNC);
|
|
data = (void *)&tmp;
|
|
break;
|
|
}
|
|
|
|
error = fo_ioctl(fp, com, data, td->td_ucred, td);
|
|
out:
|
|
fdrop(fp, td);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
poll_no_poll(int events)
|
|
{
|
|
/*
|
|
* Return true for read/write. If the user asked for something
|
|
* special, return POLLNVAL, so that clients have a way of
|
|
* determining reliably whether or not the extended
|
|
* functionality is present without hard-coding knowledge
|
|
* of specific filesystem implementations.
|
|
*/
|
|
if (events & ~POLLSTANDARD)
|
|
return (POLLNVAL);
|
|
|
|
return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
|
|
}
|
|
|
|
int
|
|
sys_pselect(struct thread *td, struct pselect_args *uap)
|
|
{
|
|
struct timespec ts;
|
|
struct timeval tv, *tvp;
|
|
sigset_t set, *uset;
|
|
int error;
|
|
|
|
if (uap->ts != NULL) {
|
|
error = copyin(uap->ts, &ts, sizeof(ts));
|
|
if (error != 0)
|
|
return (error);
|
|
TIMESPEC_TO_TIMEVAL(&tv, &ts);
|
|
tvp = &tv;
|
|
} else
|
|
tvp = NULL;
|
|
if (uap->sm != NULL) {
|
|
error = copyin(uap->sm, &set, sizeof(set));
|
|
if (error != 0)
|
|
return (error);
|
|
uset = &set;
|
|
} else
|
|
uset = NULL;
|
|
return (kern_pselect(td, uap->nd, uap->in, uap->ou, uap->ex, tvp,
|
|
uset, NFDBITS));
|
|
}
|
|
|
|
int
|
|
kern_pselect(struct thread *td, int nd, fd_set *in, fd_set *ou, fd_set *ex,
|
|
struct timeval *tvp, sigset_t *uset, int abi_nfdbits)
|
|
{
|
|
int error;
|
|
|
|
if (uset != NULL) {
|
|
error = kern_sigprocmask(td, SIG_SETMASK, uset,
|
|
&td->td_oldsigmask, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
td->td_pflags |= TDP_OLDMASK;
|
|
/*
|
|
* Make sure that ast() is called on return to
|
|
* usermode and TDP_OLDMASK is cleared, restoring old
|
|
* sigmask.
|
|
*/
|
|
thread_lock(td);
|
|
td->td_flags |= TDF_ASTPENDING;
|
|
thread_unlock(td);
|
|
}
|
|
error = kern_select(td, nd, in, ou, ex, tvp, abi_nfdbits);
|
|
return (error);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct select_args {
|
|
int nd;
|
|
fd_set *in, *ou, *ex;
|
|
struct timeval *tv;
|
|
};
|
|
#endif
|
|
int
|
|
sys_select(struct thread *td, struct select_args *uap)
|
|
{
|
|
struct timeval tv, *tvp;
|
|
int error;
|
|
|
|
if (uap->tv != NULL) {
|
|
error = copyin(uap->tv, &tv, sizeof(tv));
|
|
if (error)
|
|
return (error);
|
|
tvp = &tv;
|
|
} else
|
|
tvp = NULL;
|
|
|
|
return (kern_select(td, uap->nd, uap->in, uap->ou, uap->ex, tvp,
|
|
NFDBITS));
|
|
}
|
|
|
|
int
|
|
kern_select(struct thread *td, int nd, fd_set *fd_in, fd_set *fd_ou,
|
|
fd_set *fd_ex, struct timeval *tvp, int abi_nfdbits)
|
|
{
|
|
struct filedesc *fdp;
|
|
/*
|
|
* 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)];
|
|
fd_mask *ibits[3], *obits[3], *selbits, *sbp;
|
|
struct timeval atv, rtv, ttv;
|
|
int error, timo;
|
|
u_int nbufbytes, ncpbytes, ncpubytes, nfdbits;
|
|
|
|
if (nd < 0)
|
|
return (EINVAL);
|
|
fdp = td->td_proc->p_fd;
|
|
if (nd > fdp->fd_lastfile + 1)
|
|
nd = fdp->fd_lastfile + 1;
|
|
|
|
/*
|
|
* Allocate just enough bits for the non-null fd_sets. Use the
|
|
* preallocated auto buffer if possible.
|
|
*/
|
|
nfdbits = roundup(nd, NFDBITS);
|
|
ncpbytes = nfdbits / NBBY;
|
|
ncpubytes = roundup(nd, abi_nfdbits) / NBBY;
|
|
nbufbytes = 0;
|
|
if (fd_in != NULL)
|
|
nbufbytes += 2 * ncpbytes;
|
|
if (fd_ou != NULL)
|
|
nbufbytes += 2 * ncpbytes;
|
|
if (fd_ex != NULL)
|
|
nbufbytes += 2 * ncpbytes;
|
|
if (nbufbytes <= sizeof s_selbits)
|
|
selbits = &s_selbits[0];
|
|
else
|
|
selbits = malloc(nbufbytes, M_SELECT, M_WAITOK);
|
|
|
|
/*
|
|
* 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;
|
|
#define getbits(name, x) \
|
|
do { \
|
|
if (name == NULL) { \
|
|
ibits[x] = NULL; \
|
|
obits[x] = NULL; \
|
|
} else { \
|
|
ibits[x] = sbp + nbufbytes / 2 / sizeof *sbp; \
|
|
obits[x] = sbp; \
|
|
sbp += ncpbytes / sizeof *sbp; \
|
|
error = copyin(name, ibits[x], ncpubytes); \
|
|
if (error != 0) \
|
|
goto done; \
|
|
bzero((char *)ibits[x] + ncpubytes, \
|
|
ncpbytes - ncpubytes); \
|
|
} \
|
|
} while (0)
|
|
getbits(fd_in, 0);
|
|
getbits(fd_ou, 1);
|
|
getbits(fd_ex, 2);
|
|
#undef getbits
|
|
|
|
#if BYTE_ORDER == BIG_ENDIAN && defined(__LP64__)
|
|
/*
|
|
* XXX: swizzle_fdset assumes that if abi_nfdbits != NFDBITS,
|
|
* we are running under 32-bit emulation. This should be more
|
|
* generic.
|
|
*/
|
|
#define swizzle_fdset(bits) \
|
|
if (abi_nfdbits != NFDBITS && bits != NULL) { \
|
|
int i; \
|
|
for (i = 0; i < ncpbytes / sizeof *sbp; i++) \
|
|
bits[i] = (bits[i] >> 32) | (bits[i] << 32); \
|
|
}
|
|
#else
|
|
#define swizzle_fdset(bits)
|
|
#endif
|
|
|
|
/* Make sure the bit order makes it through an ABI transition */
|
|
swizzle_fdset(ibits[0]);
|
|
swizzle_fdset(ibits[1]);
|
|
swizzle_fdset(ibits[2]);
|
|
|
|
if (nbufbytes != 0)
|
|
bzero(selbits, nbufbytes / 2);
|
|
|
|
if (tvp != NULL) {
|
|
atv = *tvp;
|
|
if (itimerfix(&atv)) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
getmicrouptime(&rtv);
|
|
timevaladd(&atv, &rtv);
|
|
} else {
|
|
atv.tv_sec = 0;
|
|
atv.tv_usec = 0;
|
|
}
|
|
timo = 0;
|
|
seltdinit(td);
|
|
/* Iterate until the timeout expires or descriptors become ready. */
|
|
for (;;) {
|
|
error = selscan(td, ibits, obits, nd);
|
|
if (error || td->td_retval[0] != 0)
|
|
break;
|
|
if (atv.tv_sec || atv.tv_usec) {
|
|
getmicrouptime(&rtv);
|
|
if (timevalcmp(&rtv, &atv, >=))
|
|
break;
|
|
ttv = atv;
|
|
timevalsub(&ttv, &rtv);
|
|
timo = ttv.tv_sec > 24 * 60 * 60 ?
|
|
24 * 60 * 60 * hz : tvtohz(&ttv);
|
|
}
|
|
error = seltdwait(td, timo);
|
|
if (error)
|
|
break;
|
|
error = selrescan(td, ibits, obits);
|
|
if (error || td->td_retval[0] != 0)
|
|
break;
|
|
}
|
|
seltdclear(td);
|
|
|
|
done:
|
|
/* select is not restarted after signals... */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
if (error == EWOULDBLOCK)
|
|
error = 0;
|
|
|
|
/* swizzle bit order back, if necessary */
|
|
swizzle_fdset(obits[0]);
|
|
swizzle_fdset(obits[1]);
|
|
swizzle_fdset(obits[2]);
|
|
#undef swizzle_fdset
|
|
|
|
#define putbits(name, x) \
|
|
if (name && (error2 = copyout(obits[x], name, ncpubytes))) \
|
|
error = error2;
|
|
if (error == 0) {
|
|
int error2;
|
|
|
|
putbits(fd_in, 0);
|
|
putbits(fd_ou, 1);
|
|
putbits(fd_ex, 2);
|
|
#undef putbits
|
|
}
|
|
if (selbits != &s_selbits[0])
|
|
free(selbits, M_SELECT);
|
|
|
|
return (error);
|
|
}
|
|
/*
|
|
* Convert a select bit set to poll flags.
|
|
*
|
|
* The backend always returns POLLHUP/POLLERR if appropriate and we
|
|
* return this as a set bit in any set.
|
|
*/
|
|
static int select_flags[3] = {
|
|
POLLRDNORM | POLLHUP | POLLERR,
|
|
POLLWRNORM | POLLHUP | POLLERR,
|
|
POLLRDBAND | POLLERR
|
|
};
|
|
|
|
/*
|
|
* Compute the fo_poll flags required for a fd given by the index and
|
|
* bit position in the fd_mask array.
|
|
*/
|
|
static __inline int
|
|
selflags(fd_mask **ibits, int idx, fd_mask bit)
|
|
{
|
|
int flags;
|
|
int msk;
|
|
|
|
flags = 0;
|
|
for (msk = 0; msk < 3; msk++) {
|
|
if (ibits[msk] == NULL)
|
|
continue;
|
|
if ((ibits[msk][idx] & bit) == 0)
|
|
continue;
|
|
flags |= select_flags[msk];
|
|
}
|
|
return (flags);
|
|
}
|
|
|
|
/*
|
|
* Set the appropriate output bits given a mask of fired events and the
|
|
* input bits originally requested.
|
|
*/
|
|
static __inline int
|
|
selsetbits(fd_mask **ibits, fd_mask **obits, int idx, fd_mask bit, int events)
|
|
{
|
|
int msk;
|
|
int n;
|
|
|
|
n = 0;
|
|
for (msk = 0; msk < 3; msk++) {
|
|
if ((events & select_flags[msk]) == 0)
|
|
continue;
|
|
if (ibits[msk] == NULL)
|
|
continue;
|
|
if ((ibits[msk][idx] & bit) == 0)
|
|
continue;
|
|
/*
|
|
* XXX Check for a duplicate set. This can occur because a
|
|
* socket calls selrecord() twice for each poll() call
|
|
* resulting in two selfds per real fd. selrescan() will
|
|
* call selsetbits twice as a result.
|
|
*/
|
|
if ((obits[msk][idx] & bit) != 0)
|
|
continue;
|
|
obits[msk][idx] |= bit;
|
|
n++;
|
|
}
|
|
|
|
return (n);
|
|
}
|
|
|
|
static __inline int
|
|
getselfd_cap(struct filedesc *fdp, int fd, struct file **fpp)
|
|
{
|
|
struct file *fp;
|
|
#ifdef CAPABILITIES
|
|
struct file *fp_fromcap;
|
|
int error;
|
|
#endif
|
|
|
|
if ((fp = fget_unlocked(fdp, fd)) == NULL)
|
|
return (EBADF);
|
|
#ifdef CAPABILITIES
|
|
/*
|
|
* If the file descriptor is for a capability, test rights and use
|
|
* the file descriptor references by the capability.
|
|
*/
|
|
error = cap_funwrap(fp, CAP_POLL_EVENT, &fp_fromcap);
|
|
if (error) {
|
|
fdrop(fp, curthread);
|
|
return (error);
|
|
}
|
|
if (fp != fp_fromcap) {
|
|
fhold(fp_fromcap);
|
|
fdrop(fp, curthread);
|
|
fp = fp_fromcap;
|
|
}
|
|
#endif /* CAPABILITIES */
|
|
*fpp = fp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Traverse the list of fds attached to this thread's seltd and check for
|
|
* completion.
|
|
*/
|
|
static int
|
|
selrescan(struct thread *td, fd_mask **ibits, fd_mask **obits)
|
|
{
|
|
struct filedesc *fdp;
|
|
struct selinfo *si;
|
|
struct seltd *stp;
|
|
struct selfd *sfp;
|
|
struct selfd *sfn;
|
|
struct file *fp;
|
|
fd_mask bit;
|
|
int fd, ev, n, idx;
|
|
int error;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
stp = td->td_sel;
|
|
n = 0;
|
|
STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) {
|
|
fd = (int)(uintptr_t)sfp->sf_cookie;
|
|
si = sfp->sf_si;
|
|
selfdfree(stp, sfp);
|
|
/* If the selinfo wasn't cleared the event didn't fire. */
|
|
if (si != NULL)
|
|
continue;
|
|
error = getselfd_cap(fdp, fd, &fp);
|
|
if (error)
|
|
return (error);
|
|
idx = fd / NFDBITS;
|
|
bit = (fd_mask)1 << (fd % NFDBITS);
|
|
ev = fo_poll(fp, selflags(ibits, idx, bit), td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
if (ev != 0)
|
|
n += selsetbits(ibits, obits, idx, bit, ev);
|
|
}
|
|
stp->st_flags = 0;
|
|
td->td_retval[0] = n;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Perform the initial filedescriptor scan and register ourselves with
|
|
* each selinfo.
|
|
*/
|
|
static int
|
|
selscan(td, ibits, obits, nfd)
|
|
struct thread *td;
|
|
fd_mask **ibits, **obits;
|
|
int nfd;
|
|
{
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
fd_mask bit;
|
|
int ev, flags, end, fd;
|
|
int n, idx;
|
|
int error;
|
|
|
|
fdp = td->td_proc->p_fd;
|
|
n = 0;
|
|
for (idx = 0, fd = 0; fd < nfd; idx++) {
|
|
end = imin(fd + NFDBITS, nfd);
|
|
for (bit = 1; fd < end; bit <<= 1, fd++) {
|
|
/* Compute the list of events we're interested in. */
|
|
flags = selflags(ibits, idx, bit);
|
|
if (flags == 0)
|
|
continue;
|
|
error = getselfd_cap(fdp, fd, &fp);
|
|
if (error)
|
|
return (error);
|
|
selfdalloc(td, (void *)(uintptr_t)fd);
|
|
ev = fo_poll(fp, flags, td->td_ucred, td);
|
|
fdrop(fp, td);
|
|
if (ev != 0)
|
|
n += selsetbits(ibits, obits, idx, bit, ev);
|
|
}
|
|
}
|
|
|
|
td->td_retval[0] = n;
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct poll_args {
|
|
struct pollfd *fds;
|
|
u_int nfds;
|
|
int timeout;
|
|
};
|
|
#endif
|
|
int
|
|
sys_poll(td, uap)
|
|
struct thread *td;
|
|
struct poll_args *uap;
|
|
{
|
|
struct pollfd *bits;
|
|
struct pollfd smallbits[32];
|
|
struct timeval atv, rtv, ttv;
|
|
int error = 0, timo;
|
|
u_int nfds;
|
|
size_t ni;
|
|
|
|
nfds = uap->nfds;
|
|
if (nfds > maxfilesperproc && nfds > FD_SETSIZE)
|
|
return (EINVAL);
|
|
ni = nfds * sizeof(struct pollfd);
|
|
if (ni > sizeof(smallbits))
|
|
bits = malloc(ni, M_TEMP, M_WAITOK);
|
|
else
|
|
bits = smallbits;
|
|
error = copyin(uap->fds, bits, ni);
|
|
if (error)
|
|
goto done;
|
|
if (uap->timeout != INFTIM) {
|
|
atv.tv_sec = uap->timeout / 1000;
|
|
atv.tv_usec = (uap->timeout % 1000) * 1000;
|
|
if (itimerfix(&atv)) {
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
getmicrouptime(&rtv);
|
|
timevaladd(&atv, &rtv);
|
|
} else {
|
|
atv.tv_sec = 0;
|
|
atv.tv_usec = 0;
|
|
}
|
|
timo = 0;
|
|
seltdinit(td);
|
|
/* Iterate until the timeout expires or descriptors become ready. */
|
|
for (;;) {
|
|
error = pollscan(td, bits, nfds);
|
|
if (error || td->td_retval[0] != 0)
|
|
break;
|
|
if (atv.tv_sec || atv.tv_usec) {
|
|
getmicrouptime(&rtv);
|
|
if (timevalcmp(&rtv, &atv, >=))
|
|
break;
|
|
ttv = atv;
|
|
timevalsub(&ttv, &rtv);
|
|
timo = ttv.tv_sec > 24 * 60 * 60 ?
|
|
24 * 60 * 60 * hz : tvtohz(&ttv);
|
|
}
|
|
error = seltdwait(td, timo);
|
|
if (error)
|
|
break;
|
|
error = pollrescan(td);
|
|
if (error || td->td_retval[0] != 0)
|
|
break;
|
|
}
|
|
seltdclear(td);
|
|
|
|
done:
|
|
/* poll is not restarted after signals... */
|
|
if (error == ERESTART)
|
|
error = EINTR;
|
|
if (error == EWOULDBLOCK)
|
|
error = 0;
|
|
if (error == 0) {
|
|
error = pollout(td, bits, uap->fds, nfds);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
out:
|
|
if (ni > sizeof(smallbits))
|
|
free(bits, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
pollrescan(struct thread *td)
|
|
{
|
|
struct seltd *stp;
|
|
struct selfd *sfp;
|
|
struct selfd *sfn;
|
|
struct selinfo *si;
|
|
struct filedesc *fdp;
|
|
struct file *fp;
|
|
struct pollfd *fd;
|
|
int n;
|
|
|
|
n = 0;
|
|
fdp = td->td_proc->p_fd;
|
|
stp = td->td_sel;
|
|
FILEDESC_SLOCK(fdp);
|
|
STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn) {
|
|
fd = (struct pollfd *)sfp->sf_cookie;
|
|
si = sfp->sf_si;
|
|
selfdfree(stp, sfp);
|
|
/* If the selinfo wasn't cleared the event didn't fire. */
|
|
if (si != NULL)
|
|
continue;
|
|
fp = fdp->fd_ofiles[fd->fd];
|
|
#ifdef CAPABILITIES
|
|
if ((fp == NULL)
|
|
|| (cap_funwrap(fp, CAP_POLL_EVENT, &fp) != 0)) {
|
|
#else
|
|
if (fp == NULL) {
|
|
#endif
|
|
fd->revents = POLLNVAL;
|
|
n++;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Note: backend also returns POLLHUP and
|
|
* POLLERR if appropriate.
|
|
*/
|
|
fd->revents = fo_poll(fp, fd->events, td->td_ucred, td);
|
|
if (fd->revents != 0)
|
|
n++;
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
stp->st_flags = 0;
|
|
td->td_retval[0] = n;
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
pollout(td, fds, ufds, nfd)
|
|
struct thread *td;
|
|
struct pollfd *fds;
|
|
struct pollfd *ufds;
|
|
u_int nfd;
|
|
{
|
|
int error = 0;
|
|
u_int i = 0;
|
|
u_int n = 0;
|
|
|
|
for (i = 0; i < nfd; i++) {
|
|
error = copyout(&fds->revents, &ufds->revents,
|
|
sizeof(ufds->revents));
|
|
if (error)
|
|
return (error);
|
|
if (fds->revents != 0)
|
|
n++;
|
|
fds++;
|
|
ufds++;
|
|
}
|
|
td->td_retval[0] = n;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
pollscan(td, fds, nfd)
|
|
struct thread *td;
|
|
struct pollfd *fds;
|
|
u_int nfd;
|
|
{
|
|
struct filedesc *fdp = td->td_proc->p_fd;
|
|
int i;
|
|
struct file *fp;
|
|
int n = 0;
|
|
|
|
FILEDESC_SLOCK(fdp);
|
|
for (i = 0; i < nfd; i++, fds++) {
|
|
if (fds->fd >= fdp->fd_nfiles) {
|
|
fds->revents = POLLNVAL;
|
|
n++;
|
|
} else if (fds->fd < 0) {
|
|
fds->revents = 0;
|
|
} else {
|
|
fp = fdp->fd_ofiles[fds->fd];
|
|
#ifdef CAPABILITIES
|
|
if ((fp == NULL)
|
|
|| (cap_funwrap(fp, CAP_POLL_EVENT, &fp) != 0)) {
|
|
#else
|
|
if (fp == NULL) {
|
|
#endif
|
|
fds->revents = POLLNVAL;
|
|
n++;
|
|
} else {
|
|
/*
|
|
* Note: backend also returns POLLHUP and
|
|
* POLLERR if appropriate.
|
|
*/
|
|
selfdalloc(td, fds);
|
|
fds->revents = fo_poll(fp, fds->events,
|
|
td->td_ucred, td);
|
|
/*
|
|
* POSIX requires POLLOUT to be never
|
|
* set simultaneously with POLLHUP.
|
|
*/
|
|
if ((fds->revents & POLLHUP) != 0)
|
|
fds->revents &= ~POLLOUT;
|
|
|
|
if (fds->revents != 0)
|
|
n++;
|
|
}
|
|
}
|
|
}
|
|
FILEDESC_SUNLOCK(fdp);
|
|
td->td_retval[0] = n;
|
|
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
|
|
int
|
|
sys_openbsd_poll(td, uap)
|
|
register struct thread *td;
|
|
register struct openbsd_poll_args *uap;
|
|
{
|
|
return (sys_poll(td, (struct poll_args *)uap));
|
|
}
|
|
|
|
/*
|
|
* XXX This was created specifically to support netncp and netsmb. This
|
|
* allows the caller to specify a socket to wait for events on. It returns
|
|
* 0 if any events matched and an error otherwise. There is no way to
|
|
* determine which events fired.
|
|
*/
|
|
int
|
|
selsocket(struct socket *so, int events, struct timeval *tvp, struct thread *td)
|
|
{
|
|
struct timeval atv, rtv, ttv;
|
|
int error, timo;
|
|
|
|
if (tvp != NULL) {
|
|
atv = *tvp;
|
|
if (itimerfix(&atv))
|
|
return (EINVAL);
|
|
getmicrouptime(&rtv);
|
|
timevaladd(&atv, &rtv);
|
|
} else {
|
|
atv.tv_sec = 0;
|
|
atv.tv_usec = 0;
|
|
}
|
|
|
|
timo = 0;
|
|
seltdinit(td);
|
|
/*
|
|
* Iterate until the timeout expires or the socket becomes ready.
|
|
*/
|
|
for (;;) {
|
|
selfdalloc(td, NULL);
|
|
error = sopoll(so, events, NULL, td);
|
|
/* error here is actually the ready events. */
|
|
if (error)
|
|
return (0);
|
|
if (atv.tv_sec || atv.tv_usec) {
|
|
getmicrouptime(&rtv);
|
|
if (timevalcmp(&rtv, &atv, >=)) {
|
|
seltdclear(td);
|
|
return (EWOULDBLOCK);
|
|
}
|
|
ttv = atv;
|
|
timevalsub(&ttv, &rtv);
|
|
timo = ttv.tv_sec > 24 * 60 * 60 ?
|
|
24 * 60 * 60 * hz : tvtohz(&ttv);
|
|
}
|
|
error = seltdwait(td, timo);
|
|
seltdclear(td);
|
|
if (error)
|
|
break;
|
|
}
|
|
/* XXX Duplicates ncp/smb behavior. */
|
|
if (error == ERESTART)
|
|
error = 0;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Preallocate two selfds associated with 'cookie'. Some fo_poll routines
|
|
* have two select sets, one for read and another for write.
|
|
*/
|
|
static void
|
|
selfdalloc(struct thread *td, void *cookie)
|
|
{
|
|
struct seltd *stp;
|
|
|
|
stp = td->td_sel;
|
|
if (stp->st_free1 == NULL)
|
|
stp->st_free1 = uma_zalloc(selfd_zone, M_WAITOK|M_ZERO);
|
|
stp->st_free1->sf_td = stp;
|
|
stp->st_free1->sf_cookie = cookie;
|
|
if (stp->st_free2 == NULL)
|
|
stp->st_free2 = uma_zalloc(selfd_zone, M_WAITOK|M_ZERO);
|
|
stp->st_free2->sf_td = stp;
|
|
stp->st_free2->sf_cookie = cookie;
|
|
}
|
|
|
|
static void
|
|
selfdfree(struct seltd *stp, struct selfd *sfp)
|
|
{
|
|
STAILQ_REMOVE(&stp->st_selq, sfp, selfd, sf_link);
|
|
mtx_lock(sfp->sf_mtx);
|
|
if (sfp->sf_si)
|
|
TAILQ_REMOVE(&sfp->sf_si->si_tdlist, sfp, sf_threads);
|
|
mtx_unlock(sfp->sf_mtx);
|
|
uma_zfree(selfd_zone, sfp);
|
|
}
|
|
|
|
/* Drain the waiters tied to all the selfd belonging the specified selinfo. */
|
|
void
|
|
seldrain(sip)
|
|
struct selinfo *sip;
|
|
{
|
|
|
|
/*
|
|
* This feature is already provided by doselwakeup(), thus it is
|
|
* enough to go for it.
|
|
* Eventually, the context, should take care to avoid races
|
|
* between thread calling select()/poll() and file descriptor
|
|
* detaching, but, again, the races are just the same as
|
|
* selwakeup().
|
|
*/
|
|
doselwakeup(sip, -1);
|
|
}
|
|
|
|
/*
|
|
* Record a select request.
|
|
*/
|
|
void
|
|
selrecord(selector, sip)
|
|
struct thread *selector;
|
|
struct selinfo *sip;
|
|
{
|
|
struct selfd *sfp;
|
|
struct seltd *stp;
|
|
struct mtx *mtxp;
|
|
|
|
stp = selector->td_sel;
|
|
/*
|
|
* Don't record when doing a rescan.
|
|
*/
|
|
if (stp->st_flags & SELTD_RESCAN)
|
|
return;
|
|
/*
|
|
* Grab one of the preallocated descriptors.
|
|
*/
|
|
sfp = NULL;
|
|
if ((sfp = stp->st_free1) != NULL)
|
|
stp->st_free1 = NULL;
|
|
else if ((sfp = stp->st_free2) != NULL)
|
|
stp->st_free2 = NULL;
|
|
else
|
|
panic("selrecord: No free selfd on selq");
|
|
mtxp = sip->si_mtx;
|
|
if (mtxp == NULL)
|
|
mtxp = mtx_pool_find(mtxpool_select, sip);
|
|
/*
|
|
* Initialize the sfp and queue it in the thread.
|
|
*/
|
|
sfp->sf_si = sip;
|
|
sfp->sf_mtx = mtxp;
|
|
STAILQ_INSERT_TAIL(&stp->st_selq, sfp, sf_link);
|
|
/*
|
|
* Now that we've locked the sip, check for initialization.
|
|
*/
|
|
mtx_lock(mtxp);
|
|
if (sip->si_mtx == NULL) {
|
|
sip->si_mtx = mtxp;
|
|
TAILQ_INIT(&sip->si_tdlist);
|
|
}
|
|
/*
|
|
* Add this thread to the list of selfds listening on this selinfo.
|
|
*/
|
|
TAILQ_INSERT_TAIL(&sip->si_tdlist, sfp, sf_threads);
|
|
mtx_unlock(sip->si_mtx);
|
|
}
|
|
|
|
/* Wake up a selecting thread. */
|
|
void
|
|
selwakeup(sip)
|
|
struct selinfo *sip;
|
|
{
|
|
doselwakeup(sip, -1);
|
|
}
|
|
|
|
/* Wake up a selecting thread, and set its priority. */
|
|
void
|
|
selwakeuppri(sip, pri)
|
|
struct selinfo *sip;
|
|
int pri;
|
|
{
|
|
doselwakeup(sip, pri);
|
|
}
|
|
|
|
/*
|
|
* Do a wakeup when a selectable event occurs.
|
|
*/
|
|
static void
|
|
doselwakeup(sip, pri)
|
|
struct selinfo *sip;
|
|
int pri;
|
|
{
|
|
struct selfd *sfp;
|
|
struct selfd *sfn;
|
|
struct seltd *stp;
|
|
|
|
/* If it's not initialized there can't be any waiters. */
|
|
if (sip->si_mtx == NULL)
|
|
return;
|
|
/*
|
|
* Locking the selinfo locks all selfds associated with it.
|
|
*/
|
|
mtx_lock(sip->si_mtx);
|
|
TAILQ_FOREACH_SAFE(sfp, &sip->si_tdlist, sf_threads, sfn) {
|
|
/*
|
|
* Once we remove this sfp from the list and clear the
|
|
* sf_si seltdclear will know to ignore this si.
|
|
*/
|
|
TAILQ_REMOVE(&sip->si_tdlist, sfp, sf_threads);
|
|
sfp->sf_si = NULL;
|
|
stp = sfp->sf_td;
|
|
mtx_lock(&stp->st_mtx);
|
|
stp->st_flags |= SELTD_PENDING;
|
|
cv_broadcastpri(&stp->st_wait, pri);
|
|
mtx_unlock(&stp->st_mtx);
|
|
}
|
|
mtx_unlock(sip->si_mtx);
|
|
}
|
|
|
|
static void
|
|
seltdinit(struct thread *td)
|
|
{
|
|
struct seltd *stp;
|
|
|
|
if ((stp = td->td_sel) != NULL)
|
|
goto out;
|
|
td->td_sel = stp = malloc(sizeof(*stp), M_SELECT, M_WAITOK|M_ZERO);
|
|
mtx_init(&stp->st_mtx, "sellck", NULL, MTX_DEF);
|
|
cv_init(&stp->st_wait, "select");
|
|
out:
|
|
stp->st_flags = 0;
|
|
STAILQ_INIT(&stp->st_selq);
|
|
}
|
|
|
|
static int
|
|
seltdwait(struct thread *td, int timo)
|
|
{
|
|
struct seltd *stp;
|
|
int error;
|
|
|
|
stp = td->td_sel;
|
|
/*
|
|
* An event of interest may occur while we do not hold the seltd
|
|
* locked so check the pending flag before we sleep.
|
|
*/
|
|
mtx_lock(&stp->st_mtx);
|
|
/*
|
|
* Any further calls to selrecord will be a rescan.
|
|
*/
|
|
stp->st_flags |= SELTD_RESCAN;
|
|
if (stp->st_flags & SELTD_PENDING) {
|
|
mtx_unlock(&stp->st_mtx);
|
|
return (0);
|
|
}
|
|
if (timo > 0)
|
|
error = cv_timedwait_sig(&stp->st_wait, &stp->st_mtx, timo);
|
|
else
|
|
error = cv_wait_sig(&stp->st_wait, &stp->st_mtx);
|
|
mtx_unlock(&stp->st_mtx);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
seltdfini(struct thread *td)
|
|
{
|
|
struct seltd *stp;
|
|
|
|
stp = td->td_sel;
|
|
if (stp == NULL)
|
|
return;
|
|
if (stp->st_free1)
|
|
uma_zfree(selfd_zone, stp->st_free1);
|
|
if (stp->st_free2)
|
|
uma_zfree(selfd_zone, stp->st_free2);
|
|
td->td_sel = NULL;
|
|
free(stp, M_SELECT);
|
|
}
|
|
|
|
/*
|
|
* Remove the references to the thread from all of the objects we were
|
|
* polling.
|
|
*/
|
|
static void
|
|
seltdclear(struct thread *td)
|
|
{
|
|
struct seltd *stp;
|
|
struct selfd *sfp;
|
|
struct selfd *sfn;
|
|
|
|
stp = td->td_sel;
|
|
STAILQ_FOREACH_SAFE(sfp, &stp->st_selq, sf_link, sfn)
|
|
selfdfree(stp, sfp);
|
|
stp->st_flags = 0;
|
|
}
|
|
|
|
static void selectinit(void *);
|
|
SYSINIT(select, SI_SUB_SYSCALLS, SI_ORDER_ANY, selectinit, NULL);
|
|
static void
|
|
selectinit(void *dummy __unused)
|
|
{
|
|
|
|
selfd_zone = uma_zcreate("selfd", sizeof(struct selfd), NULL, NULL,
|
|
NULL, NULL, UMA_ALIGN_PTR, 0);
|
|
mtxpool_select = mtx_pool_create("select mtxpool", 128, MTX_DEF);
|
|
}
|