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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* Copyright (C) 1996,1997,1998,1999,2000,2002,2003,2006
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <sysdep-cancel.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include <kernel-features.h>
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#if !__ASSUME_REALTIME_SIGNALS
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/* The variable is shared between all wrappers around signal handling
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functions which have RT equivalents. The definition is in sigaction.c. */
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extern int __libc_missing_rt_sigs;
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static int
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do_sigsuspend (const sigset_t *set)
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{
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# ifdef __NR_rt_sigsuspend
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/* First try the RT signals. */
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if (!__libc_missing_rt_sigs)
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{
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/* XXX The size argument hopefully will have to be changed to the
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real size of the user-level sigset_t. */
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int saved_errno = errno;
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int result = INLINE_SYSCALL (rt_sigsuspend, 2,
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CHECK_SIGSET (set), _NSIG / 8);
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if (result >= 0 || errno != ENOSYS)
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return result;
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__set_errno (saved_errno);
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__libc_missing_rt_sigs = 1;
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}
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# endif
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return INLINE_SYSCALL (sigsuspend, 3, 0, 0, set->__val[0]);
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}
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#else
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static inline int __attribute__ ((always_inline))
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do_sigsuspend (const sigset_t *set)
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{
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return INLINE_SYSCALL (rt_sigsuspend, 2, CHECK_SIGSET (set), _NSIG / 8);
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}
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#endif
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/* Change the set of blocked signals to SET,
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wait until a signal arrives, and restore the set of blocked signals. */
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int
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__sigsuspend (set)
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const sigset_t *set;
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{
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if (SINGLE_THREAD_P)
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return do_sigsuspend (set);
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int oldtype = LIBC_CANCEL_ASYNC ();
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int result = do_sigsuspend (set);
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LIBC_CANCEL_RESET (oldtype);
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return result;
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}
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libc_hidden_def (__sigsuspend)
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weak_alias (__sigsuspend, sigsuspend)
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strong_alias (__sigsuspend, __libc_sigsuspend)
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#ifndef NO_CANCELLATION
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int
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__sigsuspend_nocancel (set)
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const sigset_t *set;
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{
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return do_sigsuspend (set);
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}
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#endif
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