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/* Copyright (C) 1997-2013 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 <sysdep-cancel.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#ifdef __NR_rt_sigtimedwait
static int
do_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 = INLINE_SYSCALL (rt_sigtimedwait, 4, CHECK_SIGSET (set),
CHECK_1 (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;
}
/* Return any pending signal or wait for one for the given time. */
int
__sigtimedwait (set, info, timeout)
const sigset_t *set;
siginfo_t *info;
const struct timespec *timeout;
{
if (SINGLE_THREAD_P)
return do_sigtimedwait (set, info, timeout);
int oldtype = LIBC_CANCEL_ASYNC ();
/* XXX The size argument hopefully will have to be changed to the
real size of the user-level sigset_t. */
int result = do_sigtimedwait (set, info, timeout);
LIBC_CANCEL_RESET (oldtype);
return result;
}
libc_hidden_def (__sigtimedwait)
weak_alias (__sigtimedwait, sigtimedwait)
#else
# include <signal/sigtimedwait.c>
#endif
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