freebsd-dev/lib/libpthread/thread/thr_sigsuspend.c
Daniel Eischen 88127f1a62 Make sigpending and sigsuspend account for signals that are pending on
the process as well as pending on the current thread.

Reported by:	Andrew MacIntyre <andymac@bullseye.apana.org.au>
2002-06-28 13:28:41 +00:00

102 lines
3.2 KiB
C

/*
* Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <signal.h>
#include <sys/param.h>
#include <sys/signalvar.h>
#include <errno.h>
#include <pthread.h>
#include "pthread_private.h"
__weak_reference(__sigsuspend, sigsuspend);
int
_sigsuspend(const sigset_t * set)
{
struct pthread *curthread = _get_curthread();
int ret = -1;
sigset_t oset, sigset;
/* Check if a new signal set was provided by the caller: */
if (set != NULL) {
/* Save the current signal mask: */
oset = curthread->sigmask;
/* Change the caller's mask: */
curthread->sigmask = *set;
/*
* Check if there are pending signals for the running
* thread or process that aren't blocked:
*/
sigset = curthread->sigpend;
SIGSETOR(sigset, _process_sigpending);
SIGSETNAND(sigset, curthread->sigmask);
if (SIGNOTEMPTY(sigset)) {
/*
* Call the kernel scheduler which will safely
* install a signal frame for the running thread:
*/
_thread_kern_sched_sig();
} else {
/* Wait for a signal: */
_thread_kern_sched_state(PS_SIGSUSPEND,
__FILE__, __LINE__);
}
/* Always return an interrupted error: */
errno = EINTR;
/* Restore the signal mask: */
curthread->sigmask = oset;
} else {
/* Return an invalid argument error: */
errno = EINVAL;
}
/* Return the completion status: */
return (ret);
}
int
__sigsuspend(const sigset_t * set)
{
int ret;
_thread_enter_cancellation_point();
ret = _sigsuspend(set);
_thread_leave_cancellation_point();
return ret;
}