mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 02:40:06 +00:00
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003
|
|
Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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 <unistd.h>
|
|
|
|
#include <sysdep-cancel.h>
|
|
#include <sys/syscall.h>
|
|
#include <bp-checks.h>
|
|
|
|
#include "kernel-features.h"
|
|
|
|
|
|
#if !__ASSUME_REALTIME_SIGNALS
|
|
/* The variable is shared between all wrappers around signal handling
|
|
functions which have RT equivalents. The definition is in sigaction.c. */
|
|
extern int __libc_missing_rt_sigs;
|
|
|
|
|
|
static int
|
|
do_sigsuspend (const sigset_t *set)
|
|
{
|
|
# ifdef __NR_rt_sigsuspend
|
|
/* First try the RT signals. */
|
|
if (!__libc_missing_rt_sigs)
|
|
{
|
|
/* XXX The size argument hopefully will have to be changed to the
|
|
real size of the user-level sigset_t. */
|
|
int saved_errno = errno;
|
|
int result = INLINE_SYSCALL (rt_sigsuspend, 2,
|
|
CHECK_SIGSET (set), _NSIG / 8);
|
|
if (result >= 0 || errno != ENOSYS)
|
|
return result;
|
|
|
|
__set_errno (saved_errno);
|
|
__libc_missing_rt_sigs = 1;
|
|
}
|
|
# endif
|
|
|
|
return INLINE_SYSCALL (sigsuspend, 3, 0, 0, set->__val[0]);
|
|
}
|
|
#endif
|
|
|
|
/* Change the set of blocked signals to SET,
|
|
wait until a signal arrives, and restore the set of blocked signals. */
|
|
int
|
|
__sigsuspend (set)
|
|
const sigset_t *set;
|
|
{
|
|
#if __ASSUME_REALTIME_SIGNALS
|
|
if (SINGLE_THREAD_P)
|
|
return INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set), _NSIG / 8);
|
|
|
|
int oldtype = LIBC_CANCEL_ASYNC ();
|
|
|
|
int result = INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set),
|
|
_NSIG / 8);
|
|
|
|
LIBC_CANCEL_RESET (oldtype);
|
|
|
|
return result;
|
|
#else
|
|
if (SINGLE_THREAD_P)
|
|
return do_sigsuspend (set);
|
|
|
|
int oldtype = LIBC_CANCEL_ASYNC ();
|
|
|
|
int result = do_sigsuspend (set);
|
|
|
|
LIBC_CANCEL_RESET (oldtype);
|
|
|
|
return result;
|
|
#endif
|
|
}
|
|
libc_hidden_def (__sigsuspend)
|
|
weak_alias (__sigsuspend, sigsuspend)
|
|
strong_alias (__sigsuspend, __libc_sigsuspend)
|