109 lines
3.7 KiB
C
109 lines
3.7 KiB
C
/*
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* Copyright (c) 1995-1998 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_sigaction.c,v 1.6 1999/06/20 08:28:46 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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sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
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{
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int ret = 0;
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struct sigaction gact;
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/* Check if the signal number is out of range: */
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if (sig < 1 || sig > NSIG) {
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/* Return an invalid argument: */
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errno = EINVAL;
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ret = -1;
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} else {
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/*
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* Check if the existing signal action structure contents are
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* to be returned:
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*/
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if (oact != NULL) {
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/* Return the existing signal action contents: */
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oact->sa_handler = _thread_sigact[sig - 1].sa_handler;
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oact->sa_mask = _thread_sigact[sig - 1].sa_mask;
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oact->sa_flags = _thread_sigact[sig - 1].sa_flags;
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}
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/* Check if a signal action was supplied: */
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if (act != NULL) {
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/* Set the new signal handler: */
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_thread_sigact[sig - 1].sa_mask = act->sa_mask;
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_thread_sigact[sig - 1].sa_flags = act->sa_flags;
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_thread_sigact[sig - 1].sa_handler = act->sa_handler;
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}
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/*
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* Check if the kernel needs to be advised of a change
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* in signal action:
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*/
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if (act != NULL && sig != _SCHED_SIGNAL && sig != SIGCHLD &&
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sig != SIGINFO) {
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/* Initialise the global signal action structure: */
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gact.sa_mask = act->sa_mask;
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gact.sa_flags = 0;
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/* Ensure the scheduling signal is masked: */
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sigaddset(&gact.sa_mask, _SCHED_SIGNAL);
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/*
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* Check if the signal handler is being set to
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* the default or ignore handlers:
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*/
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if (act->sa_handler == SIG_DFL ||
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act->sa_handler == SIG_IGN)
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/* Specify the built in handler: */
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gact.sa_handler = act->sa_handler;
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else
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/*
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* Specify the thread kernel signal
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* handler:
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*/
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gact.sa_handler = (void (*) ()) _thread_sig_handler;
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/* Change the signal action in the kernel: */
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if (_thread_sys_sigaction(sig,&gact,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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