1716 lines
37 KiB
C
1716 lines
37 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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int iosize_max_clamp = 1;
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SYSCTL_INT(_debug, OID_AUTO, iosize_max_clamp, CTLFLAG_RW,
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&iosize_max_clamp, 0, "Clamp max i/o size to INT_MAX");
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/*
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* Assert that the return value of read(2) and write(2) syscalls fits
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* into a register. If not, an architecture will need to provide the
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* usermode wrappers to reconstruct the result.
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*/
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CTASSERT(sizeof(register_t) >= sizeof(size_t));
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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 > IOSIZE_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 > IOSIZE_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 > IOSIZE_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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* 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 > IOSIZE_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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|
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/*
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* Gather write system call.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct writev_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_writev(struct thread *td, struct writev_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_writev(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_writev(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_write(td, fd, CAP_WRITE | CAP_SEEK, &fp);
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if (error)
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return (error);
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error = dofilewrite(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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|
* Gather positioned write system call.
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|
*/
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct pwritev_args {
|
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int fd;
|
|
struct iovec *iovp;
|
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u_int iovcnt;
|
|
off_t offset;
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};
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#endif
|
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int
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sys_pwritev(struct thread *td, struct pwritev_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_pwritev(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_pwritev(td, fd, auio, offset)
|
|
struct thread *td;
|
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struct uio *auio;
|
|
int fd;
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|
off_t offset;
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{
|
|
struct file *fp;
|
|
int error;
|
|
|
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error = fget_write(td, fd, CAP_WRITE, &fp);
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|
if (error)
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|
return (error);
|
|
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 = dofilewrite(td, fd, fp, auio, offset, FOF_OFFSET);
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fdrop(fp, td);
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return (error);
|
|
}
|
|
|
|
/*
|
|
* Common code for writev and pwritev that writes data to
|
|
* a file using the passed in uio, offset, and flags.
|
|
*/
|
|
static int
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|
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 &&
|
|
(fp->f_vnread_flags & FDEVFS_VNODE) == 0)
|
|
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));
|
|
}
|
|
|
|
/*
|
|
* In the unlikely case when user specified n greater then the last
|
|
* open file descriptor, check that no bits are set after the last
|
|
* valid fd. We must return EBADF if any is set.
|
|
*
|
|
* There are applications that rely on the behaviour.
|
|
*
|
|
* nd is fd_lastfile + 1.
|
|
*/
|
|
static int
|
|
select_check_badfd(fd_set *fd_in, int nd, int ndu, int abi_nfdbits)
|
|
{
|
|
char *addr, *oaddr;
|
|
int b, i, res;
|
|
uint8_t bits;
|
|
|
|
if (nd >= ndu || fd_in == NULL)
|
|
return (0);
|
|
|
|
oaddr = NULL;
|
|
bits = 0; /* silence gcc */
|
|
for (i = nd; i < ndu; i++) {
|
|
b = i / NBBY;
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
addr = (char *)fd_in + b;
|
|
#else
|
|
addr = (char *)fd_in;
|
|
if (abi_nfdbits == NFDBITS) {
|
|
addr += rounddown(b, sizeof(fd_mask)) +
|
|
sizeof(fd_mask) - 1 - b % sizeof(fd_mask);
|
|
} else {
|
|
addr += rounddown(b, sizeof(uint32_t)) +
|
|
sizeof(uint32_t) - 1 - b % sizeof(uint32_t);
|
|
}
|
|
#endif
|
|
if (addr != oaddr) {
|
|
res = fubyte(addr);
|
|
if (res == -1)
|
|
return (EFAULT);
|
|
oaddr = addr;
|
|
bits = res;
|
|
}
|
|
if ((bits & (1 << (i % NBBY))) != 0)
|
|
return (EBADF);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
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, lf, ndu, timo;
|
|
u_int nbufbytes, ncpbytes, ncpubytes, nfdbits;
|
|
|
|
if (nd < 0)
|
|
return (EINVAL);
|
|
fdp = td->td_proc->p_fd;
|
|
ndu = nd;
|
|
lf = fdp->fd_lastfile;
|
|
if (nd > lf + 1)
|
|
nd = lf + 1;
|
|
|
|
error = select_check_badfd(fd_in, nd, ndu, abi_nfdbits);
|
|
if (error != 0)
|
|
return (error);
|
|
error = select_check_badfd(fd_ou, nd, ndu, abi_nfdbits);
|
|
if (error != 0)
|
|
return (error);
|
|
error = select_check_badfd(fd_ex, nd, ndu, abi_nfdbits);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* 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, 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));
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|