mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 02:20:10 +00:00
7a1147946e
2003-06-15 Ulrich Drepper <drepper@redhat.com> Fix cancellation point handling wrt exception based cleanup. * io/Makefile: Compile fcntl.c, poll.c, and lockf.c with exceptions. * misc/Makefile: Compile pselect.c, readv.c, writev.c, and usleep.c with exceptions. * posix/Makefile: Compile pread.c, pread64.c, pwrite.c, pwrite64.c, sleep.c, wait.c, waitid.c, and waitpid.c with exceptions. * rt/Makefile: Compile aio_suspend.c and clock_nanosleep.c with exceptions. * signal/Makefile: Compile sigpause.c, sigsuspend.c, sigtimedwait.c, sigwait.c, and sigwaitinfo.c with exceptions. * stdlib/Makefile: Compile system.c with exceptions. * sysvipc/Makefile: Compile msgrcv.c and msgsnd.c with exceptions. * termios/Makefile: Compile tcdrain.c with exceptions. * sysdeps/generic/lockf.c: Add comment explaining the cancellation situation. * sysdeps/generic/pselect.c: Likewise. * sysdeps/posix/sigpause.c: Likewise. * sysdeps/posix/system.c: Likewise. * sysdeps/posix/waitid.c: Likewise. * sysdeps/unix/sysv/linux/sleep.c: Likewise. * sysdeps/unix/sysv/linux/usleep.c: Likewise. * sysdeps/unix/sysv/linux/i386/sysdep.h: Major rewrite of INTERNAL_SYSCALL to not use push inside asm statement so that unwind info is correct around the syscall. * sysdeps/unix/clock_nanosleep.c: Add cancellation support. * sysdeps/unix/sysv/linux/clock_nanosleep.c: Likewise.
89 lines
3.0 KiB
C
89 lines
3.0 KiB
C
/* Copyright (C) 1996,1997,1998,2001,2002,2003 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <stddef.h> /* For NULL. */
|
|
#include <sys/time.h>
|
|
#include <sys/select.h>
|
|
#include <sysdep-cancel.h>
|
|
|
|
/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
|
|
readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
|
|
(if not NULL) for exceptional conditions. If TIMEOUT is not NULL, time out
|
|
after waiting the interval specified therein. Additionally set the sigmask
|
|
SIGMASK for this call. Returns the number of ready descriptors, or -1 for
|
|
errors. */
|
|
static int
|
|
do_pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
|
|
const struct timespec *timeout, const sigset_t *sigmask)
|
|
{
|
|
struct timeval tval;
|
|
int retval;
|
|
sigset_t savemask;
|
|
|
|
/* Change nanosecond number to microseconds. This might mean losing
|
|
precision and therefore the `pselect` should be available. But
|
|
for now it is hardly found. */
|
|
if (timeout != NULL)
|
|
TIMESPEC_TO_TIMEVAL (&tval, timeout);
|
|
|
|
/* The setting and restoring of the signal mask and the select call
|
|
should be an atomic operation. This can't be done without kernel
|
|
help. */
|
|
if (sigmask != NULL)
|
|
__sigprocmask (SIG_SETMASK, sigmask, &savemask);
|
|
|
|
/* Note the pselect() is a cancellation point. But since we call
|
|
select() which itself is a cancellation point we do not have
|
|
to do anything here. */
|
|
retval = __select (nfds, readfds, writefds, exceptfds,
|
|
timeout != NULL ? &tval : NULL);
|
|
|
|
if (sigmask != NULL)
|
|
__sigprocmask (SIG_SETMASK, &savemask, NULL);
|
|
|
|
return retval;
|
|
}
|
|
|
|
|
|
int
|
|
__pselect (nfds, readfds, writefds, exceptfds, timeout, sigmask)
|
|
int nfds;
|
|
fd_set *readfds;
|
|
fd_set *writefds;
|
|
fd_set *exceptfds;
|
|
const struct timespec *timeout;
|
|
const sigset_t *sigmask;
|
|
{
|
|
if (SINGLE_THREAD_P)
|
|
return do_pselect (nfds, readfds, writefds, exceptfds, timeout, sigmask);
|
|
|
|
int oldtype = LIBC_CANCEL_ASYNC ();
|
|
|
|
int result = do_pselect (nfds, readfds, writefds, exceptfds, timeout,
|
|
sigmask);
|
|
|
|
LIBC_CANCEL_RESET (oldtype);
|
|
|
|
return result;
|
|
}
|
|
weak_alias (__pselect, pselect)
|
|
strong_alias (__pselect, __libc_pselect)
|