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107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*
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* Copyright (c) 1997 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/signalvar.h>
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#include <errno.h>
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#include <signal.h>
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#include <pthread.h>
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#include "pthread_private.h"
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__weak_reference(_pthread_sigmask, pthread_sigmask);
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int
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_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
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{
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struct pthread *curthread = _get_curthread();
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sigset_t sigset;
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int ret = 0;
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/* Check if the existing signal process mask is to be returned: */
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if (oset != NULL) {
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/* Return the current mask: */
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*oset = curthread->sigmask;
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}
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/* Check if a new signal set was provided by the caller: */
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if (set != NULL) {
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/* Process according to what to do: */
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switch (how) {
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/* Block signals: */
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case SIG_BLOCK:
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/* Add signals to the existing mask: */
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SIGSETOR(curthread->sigmask, *set);
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break;
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/* Unblock signals: */
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case SIG_UNBLOCK:
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/* Clear signals from the existing mask: */
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SIGSETNAND(curthread->sigmask, *set);
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break;
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/* Set the signal process mask: */
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case SIG_SETMASK:
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/* Set the new mask: */
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curthread->sigmask = *set;
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break;
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/* Trap invalid actions: */
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default:
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/* Return an invalid argument: */
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errno = EINVAL;
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ret = -1;
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break;
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}
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/* Increment the sequence number: */
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curthread->sigmask_seqno++;
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/*
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* Check if there are pending signals for the running
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* thread or process that aren't blocked:
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*/
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sigset = curthread->sigpend;
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SIGSETOR(sigset, _process_sigpending);
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SIGSETNAND(sigset, curthread->sigmask);
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if (SIGNOTEMPTY(sigset))
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/*
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* Call the kernel scheduler which will safely
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* install a signal frame for the running thread:
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*/
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_thread_kern_sched_sig();
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}
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/* Return the completion status: */
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return (ret);
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}
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