127 lines
3.7 KiB
C
127 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. 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 "namespace.h"
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#include <signal.h>
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#include <errno.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "thr_private.h"
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__weak_reference(_sigaction, sigaction);
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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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int err = 0;
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struct sigaction newact, oldact;
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struct pthread *curthread;
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kse_critical_t crit;
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/* Check if the signal number is out of range: */
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if (sig < 1 || sig > _SIG_MAXSIG) {
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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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if (act)
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newact = *act;
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crit = _kse_critical_enter();
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curthread = _get_curthread();
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KSE_LOCK_ACQUIRE(curthread->kse, &_thread_signal_lock);
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oldact = _thread_sigact[sig - 1];
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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] = newact;
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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) {
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newact.sa_flags |= SA_SIGINFO;
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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 (newact.sa_handler != SIG_DFL &&
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newact.sa_handler != SIG_IGN) {
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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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newact.sa_sigaction = _thr_sig_handler;
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}
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/*
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* Install libpthread signal handler wrapper
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* for SIGINFO signal if threads dump enabled
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* even if a user set the signal handler to
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* SIG_DFL or SIG_IGN.
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*/
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if (sig == SIGINFO && _thr_dump_enabled()) {
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newact.sa_sigaction = _thr_sig_handler;
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}
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/* Change the signal action in the kernel: */
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if (__sys_sigaction(sig, &newact, NULL) != 0) {
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_thread_sigact[sig - 1] = oldact;
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/* errno is in kse, will copy it to thread */
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err = errno;
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ret = -1;
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}
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}
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KSE_LOCK_RELEASE(curthread->kse, &_thread_signal_lock);
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_kse_critical_leave(crit);
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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 = oldact;
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}
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if (ret != 0) {
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/* Return errno to thread */
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errno = err;
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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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