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opnsense-src/lib/libthr/thread/thr_syscalls.c
Konstantin Belousov b072e86d09 Make kevent(2) a cancellation point. 
Note that to cancel blocked kevent(2) call, changelist must be empty,
since we cannot cancel a call which already made changes to the
process state.  And in reverse, call which only makes changes to the
kqueue state, without waiting for an event, is not cancellable.  This
makes a natural usage model to migrate kqueue loop to support
cancellation, where existing single kevent(2) call must be split into
two: first uncancellable update of kqueue, then cancellable wait for
events.

Note that this is ABI-incompatible change, but it is believed that
there is no cancel-safe code that relies on kevent(2) not being a
cancellation point.  Option to preserve the ABI would be to keep
kevent(2) as is, but add new call with flags to specify cancellation
behaviour, which only value seems to add complications.

Suggested and reviewed by:	jilles
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
2015-03-29 19:14:41 +00:00

630 lines
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/*
* Copyright (c) 2014 The FreeBSD Foundation.
* Copyright (C) 2005 David Xu <davidxu@freebsd.org>.
* Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>.
* Copyright (C) 2000 Jason Evans <jasone@freebsd.org>.
* All rights reserved.
*
* Portions of this software were developed by Konstantin Belousov
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice(s), this list of conditions and the following disclaimer as
* the first lines of this file unmodified other than the possible
* addition of one or more copyright notices.
* 2. Redistributions in binary form must reproduce the above copyright
* notice(s), this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/select.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <aio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <pthread.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "thr_private.h"
#ifdef SYSCALL_COMPAT
extern int __fcntl_compat(int, int, ...);
#endif
static int
__thr_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_accept(s, addr, addrlen);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* If thread is canceled, no socket is created.
*/
static int
__thr_accept4(int s, struct sockaddr *addr, socklen_t *addrlen, int flags)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_accept4(s, addr, addrlen, flags);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
static int
__thr_aio_suspend(const struct aiocb * const iocbs[], int niocb, const struct
timespec *timeout)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_aio_suspend(iocbs, niocb, timeout);
_thr_cancel_leave(curthread, 1);
return (ret);
}
/*
* Cancellation behavior:
* According to manual of close(), the file descriptor is always deleted.
* Here, thread is only canceled after the system call, so the file
* descriptor is always deleted despite whether the thread is canceled
* or not.
*/
static int
__thr_close(int fd)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter2(curthread, 0);
ret = __sys_close(fd);
_thr_cancel_leave(curthread, 1);
return (ret);
}
/*
* Cancellation behavior:
* If the thread is canceled, connection is not made.
*/
static int
__thr_connect(int fd, const struct sockaddr *name, socklen_t namelen)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_connect(fd, name, namelen);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* According to specification, only F_SETLKW is a cancellation point.
* Thread is only canceled at start, or canceled if the system call
* is failure, this means the function does not generate side effect
* if it is canceled.
*/
static int
__thr_fcntl(int fd, int cmd, ...)
{
struct pthread *curthread;
int ret;
va_list ap;
curthread = _get_curthread();
va_start(ap, cmd);
if (cmd == F_OSETLKW || cmd == F_SETLKW) {
_thr_cancel_enter(curthread);
#ifdef SYSCALL_COMPAT
ret = __fcntl_compat(fd, cmd, va_arg(ap, void *));
#else
ret = __sys_fcntl(fd, cmd, va_arg(ap, void *));
#endif
_thr_cancel_leave(curthread, ret == -1);
} else {
#ifdef SYSCALL_COMPAT
ret = __fcntl_compat(fd, cmd, va_arg(ap, void *));
#else
ret = __sys_fcntl(fd, cmd, va_arg(ap, void *));
#endif
}
va_end(ap);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled after system call.
*/
static int
__thr_fsync(int fd)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter2(curthread, 0);
ret = __sys_fsync(fd);
_thr_cancel_leave(curthread, 1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled after system call.
*/
static int
__thr_msync(void *addr, size_t len, int flags)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter2(curthread, 0);
ret = __sys_msync(addr, len, flags);
_thr_cancel_leave(curthread, 1);
return (ret);
}
static int
__thr_nanosleep(const struct timespec *time_to_sleep,
struct timespec *time_remaining)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_nanosleep(time_to_sleep, time_remaining);
_thr_cancel_leave(curthread, 1);
return (ret);
}
/*
* Cancellation behavior:
* If the thread is canceled, file is not opened.
*/
static int
__thr_openat(int fd, const char *path, int flags, ...)
{
struct pthread *curthread;
int mode, ret;
va_list ap;
/* Check if the file is being created: */
if ((flags & O_CREAT) != 0) {
/* Get the creation mode: */
va_start(ap, flags);
mode = va_arg(ap, int);
va_end(ap);
} else {
mode = 0;
}
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_openat(fd, path, flags, mode);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns something,
* the thread is not canceled.
*/
static int
__thr_poll(struct pollfd *fds, unsigned int nfds, int timeout)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_poll(fds, nfds, timeout);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns something,
* the thread is not canceled.
*/
static int
__thr_pselect(int count, fd_set *rfds, fd_set *wfds, fd_set *efds,
const struct timespec *timo, const sigset_t *mask)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_pselect(count, rfds, wfds, efds, timo, mask);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
static int
__thr_kevent(int kq, const struct kevent *changelist, int nchanges,
struct kevent *eventlist, int nevents, const struct timespec *timeout)
{
struct pthread *curthread;
int ret;
if (nevents == 0) {
/*
* No blocking, do not make the call cancellable.
*/
return (__sys_kevent(kq, changelist, nchanges, eventlist,
nevents, timeout));
}
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_kevent(kq, changelist, nchanges, eventlist, nevents,
timeout);
_thr_cancel_leave(curthread, ret == -1 && nchanges == 0);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call got some data,
* the thread is not canceled.
*/
static ssize_t
__thr_read(int fd, void *buf, size_t nbytes)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_read(fd, buf, nbytes);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call got some data,
* the thread is not canceled.
*/
static ssize_t
__thr_readv(int fd, const struct iovec *iov, int iovcnt)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_readv(fd, iov, iovcnt);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call got some data,
* the thread is not canceled.
*/
static ssize_t
__thr_recvfrom(int s, void *b, size_t l, int f, struct sockaddr *from,
socklen_t *fl)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_recvfrom(s, b, l, f, from, fl);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call got some data,
* the thread is not canceled.
*/
static ssize_t
__thr_recvmsg(int s, struct msghdr *m, int f)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_recvmsg(s, m, f);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns something,
* the thread is not canceled.
*/
static int
__thr_select(int numfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_select(numfds, readfds, writefds, exceptfds, timeout);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call sent
* data, the thread is not canceled.
*/
static ssize_t
__thr_sendmsg(int s, const struct msghdr *m, int f)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_sendmsg(s, m, f);
_thr_cancel_leave(curthread, ret <= 0);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call sent some
* data, the thread is not canceled.
*/
static ssize_t
__thr_sendto(int s, const void *m, size_t l, int f, const struct sockaddr *t,
socklen_t tl)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_sendto(s, m, l, f, t, tl);
_thr_cancel_leave(curthread, ret <= 0);
return (ret);
}
static int
__thr_system(const char *string)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __libc_system(string);
_thr_cancel_leave(curthread, 1);
return (ret);
}
/*
* Cancellation behavior:
* If thread is canceled, the system call is not completed,
* this means not all bytes were drained.
*/
static int
__thr_tcdrain(int fd)
{
struct pthread *curthread;
int ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __libc_tcdrain(fd);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the system call returns
* a child pid, the thread is not canceled.
*/
static pid_t
__thr_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
{
struct pthread *curthread;
pid_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_wait4(pid, status, options, rusage);
_thr_cancel_leave(curthread, ret <= 0);
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the thread wrote some data,
* it is not canceled.
*/
static ssize_t
__thr_write(int fd, const void *buf, size_t nbytes)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_write(fd, buf, nbytes);
_thr_cancel_leave(curthread, (ret <= 0));
return (ret);
}
/*
* Cancellation behavior:
* Thread may be canceled at start, but if the thread wrote some data,
* it is not canceled.
*/
static ssize_t
__thr_writev(int fd, const struct iovec *iov, int iovcnt)
{
struct pthread *curthread;
ssize_t ret;
curthread = _get_curthread();
_thr_cancel_enter(curthread);
ret = __sys_writev(fd, iov, iovcnt);
_thr_cancel_leave(curthread, (ret <= 0));
return (ret);
}
void
__thr_interpose_libc(void)
{
__set_error_selector(__error_threaded);
#define SLOT(name) \
*(__libc_interposing_slot(INTERPOS_##name)) = \
(interpos_func_t)__thr_##name;
SLOT(accept);
SLOT(accept4);
SLOT(aio_suspend);
SLOT(close);
SLOT(connect);
SLOT(fcntl);
SLOT(fsync);
SLOT(fork);
SLOT(msync);
SLOT(nanosleep);
SLOT(openat);
SLOT(poll);
SLOT(pselect);
SLOT(read);
SLOT(readv);
SLOT(recvfrom);
SLOT(recvmsg);
SLOT(select);
SLOT(sendmsg);
SLOT(sendto);
SLOT(setcontext);
SLOT(sigaction);
SLOT(sigprocmask);
SLOT(sigsuspend);
SLOT(sigwait);
SLOT(sigtimedwait);
SLOT(sigwaitinfo);
SLOT(swapcontext);
SLOT(system);
SLOT(tcdrain);
SLOT(wait4);
SLOT(write);
SLOT(writev);
SLOT(spinlock);
SLOT(spinunlock);
SLOT(kevent);
#undef SLOT
*(__libc_interposing_slot(
INTERPOS__pthread_mutex_init_calloc_cb)) =
(interpos_func_t)_pthread_mutex_init_calloc_cb;
}
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