118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 1995-1998 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
#include "thr_private.h"
|
|
|
|
__weak_reference(_sigaction, sigaction);
|
|
|
|
int
|
|
_sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
|
|
{
|
|
int ret = 0;
|
|
int err = 0;
|
|
struct sigaction newact, oldact;
|
|
struct pthread *curthread;
|
|
kse_critical_t crit;
|
|
|
|
/* Check if the signal number is out of range: */
|
|
if (sig < 1 || sig > _SIG_MAXSIG) {
|
|
/* Return an invalid argument: */
|
|
errno = EINVAL;
|
|
ret = -1;
|
|
} else {
|
|
if (act)
|
|
newact = *act;
|
|
|
|
crit = _kse_critical_enter();
|
|
curthread = _get_curthread();
|
|
KSE_LOCK_ACQUIRE(curthread->kse, &_thread_signal_lock);
|
|
|
|
oldact = _thread_sigact[sig - 1];
|
|
|
|
/* Check if a signal action was supplied: */
|
|
if (act != NULL) {
|
|
/* Set the new signal handler: */
|
|
_thread_sigact[sig - 1] = newact;
|
|
}
|
|
|
|
/*
|
|
* Check if the kernel needs to be advised of a change
|
|
* in signal action:
|
|
*/
|
|
if (act != NULL && sig != SIGINFO) {
|
|
|
|
newact.sa_flags |= SA_SIGINFO;
|
|
|
|
/*
|
|
* Check if the signal handler is being set to
|
|
* the default or ignore handlers:
|
|
*/
|
|
if (newact.sa_handler != SIG_DFL &&
|
|
newact.sa_handler != SIG_IGN) {
|
|
/*
|
|
* Specify the thread kernel signal
|
|
* handler:
|
|
*/
|
|
newact.sa_handler = (void (*) ())_thr_sig_handler;
|
|
}
|
|
/* Change the signal action in the kernel: */
|
|
if (__sys_sigaction(sig, &newact, NULL) != 0) {
|
|
_thread_sigact[sig - 1] = oldact;
|
|
/* errno is in kse, will copy it to thread */
|
|
err = errno;
|
|
ret = -1;
|
|
}
|
|
}
|
|
KSE_LOCK_RELEASE(curthread->kse, &_thread_signal_lock);
|
|
_kse_critical_leave(crit);
|
|
/*
|
|
* Check if the existing signal action structure contents are
|
|
* to be returned:
|
|
*/
|
|
if (oact != NULL) {
|
|
/* Return the existing signal action contents: */
|
|
*oact = oldact;
|
|
}
|
|
if (ret != 0) {
|
|
/* Return errno to thread */
|
|
errno = err;
|
|
}
|
|
}
|
|
|
|
/* Return the completion status: */
|
|
return (ret);
|
|
}
|