freebsd-dev/lib/libpthread/thread/thr_sigmask.c
Daniel Eischen 437df4859a To be consistent, use the __weak_reference macro from <sys/cdefs.h>
instead of #pragma weak to create weak definitions.

Suggested by:	bde
2001-04-10 04:19:21 +00:00

107 lines
3.4 KiB
C

/*
* Copyright (c) 1997 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 <sys/param.h>
#include <sys/types.h>
#include <sys/signalvar.h>
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include "pthread_private.h"
__weak_reference(_pthread_sigmask, pthread_sigmask);
int
_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
{
struct pthread *curthread = _get_curthread();
sigset_t sigset;
int ret = 0;
/* Check if the existing signal process mask is to be returned: */
if (oset != NULL) {
/* Return the current mask: */
*oset = curthread->sigmask;
}
/* Check if a new signal set was provided by the caller: */
if (set != NULL) {
/* Process according to what to do: */
switch (how) {
/* Block signals: */
case SIG_BLOCK:
/* Add signals to the existing mask: */
SIGSETOR(curthread->sigmask, *set);
break;
/* Unblock signals: */
case SIG_UNBLOCK:
/* Clear signals from the existing mask: */
SIGSETNAND(curthread->sigmask, *set);
break;
/* Set the signal process mask: */
case SIG_SETMASK:
/* Set the new mask: */
curthread->sigmask = *set;
break;
/* Trap invalid actions: */
default:
/* Return an invalid argument: */
errno = EINVAL;
ret = -1;
break;
}
/* Increment the sequence number: */
curthread->sigmask_seqno++;
/*
* 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();
}
/* Return the completion status: */
return (ret);
}