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glibc/sysdeps/unix/sysv/linux/sigprocmask.c
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/* Copyright (C) 1997-2016 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include <signal.h> | |
#include <string.h> /* Needed for string function builtin redirection. */ | |
#include <unistd.h> | |
#include <sysdep.h> | |
#include <sys/syscall.h> | |
#include <nptl/pthreadP.h> /* SIGCANCEL, SIGSETXID */ | |
/* Get and/or change the set of blocked signals. */ | |
int | |
__sigprocmask (int how, const sigset_t *set, sigset_t *oset) | |
{ | |
#ifdef SIGCANCEL | |
sigset_t local_newmask; | |
/* The only thing we have to make sure here is that SIGCANCEL and | |
SIGSETXID are not blocked. */ | |
if (set != NULL | |
&& (__builtin_expect (__sigismember (set, SIGCANCEL), 0) | |
# ifdef SIGSETXID | |
|| __builtin_expect (__sigismember (set, SIGSETXID), 0) | |
# endif | |
)) | |
{ | |
local_newmask = *set; | |
__sigdelset (&local_newmask, SIGCANCEL); | |
# ifdef SIGSETXID | |
__sigdelset (&local_newmask, SIGSETXID); | |
# endif | |
set = &local_newmask; | |
} | |
#endif | |
return INLINE_SYSCALL (rt_sigprocmask, 4, how, set, oset, _NSIG / 8); | |
} | |
weak_alias (__sigprocmask, sigprocmask) |