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91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* Copyright (C) 1997-2001,2003,2004,2006 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 <string.h> /* Neede for string function builtin redirection. */
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#include <unistd.h>
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#include <sysdep.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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/* 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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/* Get and/or change the set of blocked signals. */
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int
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__sigprocmask (how, set, oset)
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int how;
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const sigset_t *set;
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sigset_t *oset;
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{
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#ifdef SIGCANCEL
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sigset_t local_newmask;
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/* The only thing we have to make sure here is that SIGCANCEL and
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SIGSETXID are not blocked. */
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if (set != NULL
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&& (__builtin_expect (__sigismember (set, SIGCANCEL), 0)
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# ifdef SIGSETXID
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|| __builtin_expect (__sigismember (set, SIGSETXID), 0)
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# endif
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))
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{
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local_newmask = *set;
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__sigdelset (&local_newmask, SIGCANCEL);
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# ifdef SIGSETXID
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__sigdelset (&local_newmask, SIGSETXID);
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# endif
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set = &local_newmask;
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}
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#endif
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#if __ASSUME_REALTIME_SIGNALS > 0
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return INLINE_SYSCALL (rt_sigprocmask, 4, how, CHECK_SIGSET_NULL_OK (set),
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CHECK_SIGSET_NULL_OK (oset), _NSIG / 8);
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#else
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# ifdef __NR_rt_sigprocmask
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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_sigprocmask, 4, how,
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CHECK_SIGSET_NULL_OK (set),
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CHECK_SIGSET_NULL_OK (oset), _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 (sigprocmask, 3, how, CHECK_SIGSET_NULL_OK (set),
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CHECK_SIGSET_NULL_OK (oset));
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#endif
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}
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weak_alias (__sigprocmask, sigprocmask)
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