140 lines
4.4 KiB
C
140 lines
4.4 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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* $Id: uthread_sigwait.c,v 1.6 1999/06/20 08:28:47 jb Exp $
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*/
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#include <signal.h>
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#include <errno.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include "pthread_private.h"
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int
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sigwait(const sigset_t * set, int *sig)
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{
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int ret = 0;
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int i;
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sigset_t tempset, waitset;
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struct sigaction act;
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/*
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* Specify the thread kernel signal handler.
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*/
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act.sa_handler = (void (*) ()) _thread_sig_handler;
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act.sa_flags = SA_RESTART;
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act.sa_mask = *set;
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/* Ensure the scheduling signal is masked: */
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sigaddset(&act.sa_mask, _SCHED_SIGNAL);
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/*
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* Initialize the set of signals that will be waited on:
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*/
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waitset = *set;
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/* These signals can't be waited on. */
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sigdelset(&waitset, SIGKILL);
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sigdelset(&waitset, SIGSTOP);
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sigdelset(&waitset, _SCHED_SIGNAL);
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sigdelset(&waitset, SIGCHLD);
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sigdelset(&waitset, SIGINFO);
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/* Check to see if a pending signal is in the wait mask. */
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if (tempset = (_thread_run->sigpend & waitset)) {
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/* Enter a loop to find a pending signal: */
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for (i = 1; i < NSIG; i++) {
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if (sigismember (&tempset, i))
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break;
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}
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/* Clear the pending signal: */
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sigdelset(&_thread_run->sigpend,i);
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/* Return the signal number to the caller: */
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*sig = i;
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return (0);
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}
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/*
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* Enter a loop to find the signals that are SIG_DFL. For
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* these signals we must install a dummy signal handler in
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* order for the kernel to pass them in to us. POSIX says
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* that the _application_ must explicitly install a dummy
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* handler for signals that are SIG_IGN in order to sigwait
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* on them. Note that SIG_IGN signals are left in the
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* mask because a subsequent sigaction could enable an
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* ignored signal.
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*/
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for (i = 1; i < NSIG; i++) {
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if (sigismember(&waitset, i) &&
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(_thread_sigact[i - 1].sa_handler == SIG_DFL)) {
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if (_thread_sys_sigaction(i,&act,NULL) != 0)
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ret = -1;
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}
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}
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if (ret == 0) {
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/*
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* Save the wait signal mask. The wait signal
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* mask is independent of the threads signal mask
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* and requires separate storage.
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*/
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_thread_run->data.sigwait = &waitset;
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/* Wait for a signal: */
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_thread_kern_sched_state(PS_SIGWAIT, __FILE__, __LINE__);
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/* Return the signal number to the caller: */
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*sig = _thread_run->signo;
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/*
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* Probably unnecessary, but since it's in a union struct
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* we don't know how it could be used in the future.
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*/
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_thread_run->data.sigwait = NULL;
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}
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/* Restore the sigactions: */
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act.sa_handler = SIG_DFL;
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for (i = 1; i < NSIG; i++) {
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if (sigismember(&waitset, i) &&
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(_thread_sigact[i - 1].sa_handler == SIG_DFL)) {
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if (_thread_sys_sigaction(i,&act,NULL) != 0)
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ret = -1;
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}
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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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#endif
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