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glibc/sysdeps/unix/sysv/linux/sigtimedwait.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> | |
#include <nptl/pthreadP.h> | |
#include <sysdep-cancel.h> | |
#include <sys/syscall.h> | |
#ifdef __NR_rt_sigtimedwait | |
int | |
__sigtimedwait (const sigset_t *set, siginfo_t *info, | |
const struct timespec *timeout) | |
{ | |
#ifdef SIGCANCEL | |
sigset_t tmpset; | |
if (set != NULL | |
&& (__builtin_expect (__sigismember (set, SIGCANCEL), 0) | |
# ifdef SIGSETXID | |
|| __builtin_expect (__sigismember (set, SIGSETXID), 0) | |
# endif | |
)) | |
{ | |
/* Create a temporary mask without the bit for SIGCANCEL set. */ | |
// We are not copying more than we have to. | |
memcpy (&tmpset, set, _NSIG / 8); | |
__sigdelset (&tmpset, SIGCANCEL); | |
# ifdef SIGSETXID | |
__sigdelset (&tmpset, SIGSETXID); | |
# endif | |
set = &tmpset; | |
} | |
#endif | |
/* XXX The size argument hopefully will have to be changed to the | |
real size of the user-level sigset_t. */ | |
int result = SYSCALL_CANCEL (rt_sigtimedwait, set, info, timeout, _NSIG / 8); | |
/* The kernel generates a SI_TKILL code in si_code in case tkill is | |
used. tkill is transparently used in raise(). Since having | |
SI_TKILL as a code is useful in general we fold the results | |
here. */ | |
if (result != -1 && info != NULL && info->si_code == SI_TKILL) | |
info->si_code = SI_USER; | |
return result; | |
} | |
libc_hidden_def (__sigtimedwait) | |
weak_alias (__sigtimedwait, sigtimedwait) | |
#else | |
# include <signal/sigtimedwait.c> | |
#endif |