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/* $OpenBSD: uthread_sigmask.c,v 1.9 2010/01/03 23:05:35 fgsch Exp $ */
/*
* 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: uthread_sigmask.c,v 1.5 1999/09/29 15:18:40 marcel Exp $
*/
#include <errno.h>
#include <signal.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include "pthread_private.h"
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: */
curthread->sigmask |= *set;
break;
/* Unblock signals: */
case SIG_UNBLOCK:
/* Clear signals from the existing mask: */
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: */
ret = EINVAL;
break;
}
/*
* Check if there are pending signals for the running
* thread or process that aren't blocked:
*/
sigset = curthread->sigpend;
sigset |= _process_sigpending;
sigset &= ~curthread->sigmask;
if (sigset != 0)
/*
* Call the kernel scheduler which will safely
* install a signal frame for the running thread:
*/
_thread_kern_sched(NULL);
}
/* Return the completion status: */
return (ret);
}
#endif
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