File: [local] / prex-old / usr / lib / posix / signal / sigaction.c (download)
Revision 1.1.1.1 (vendor branch), Tue Jun 3 09:38:50 2008 UTC (16 years, 3 months ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, PREX_0_7_BASE, HEAD Changes since 1.1: +0 -0 lines
Yeah, this is an initial import of Prex, portable real-time microkernel
operating system. I wanna hack it for non-profit but fun, so let it in.
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/*
* Copyright (c) 2005, Kohsuke Ohtani
* 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. 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 THE AUTHOR 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.
*/
#include <prex/signal.h>
#include <stddef.h>
#include <signal.h>
#include <errno.h>
/*
* If act is not NULL, set the action for signum.
* If oact is not NULL. store the old action to oact.
*/
int
sigaction(int signum, const struct sigaction *act, struct sigaction *oact)
{
struct sigaction *sa;
if (signum <= 0 || signum >= NSIG ||
signum == SIGSTOP || signum == SIGKILL) {
errno = EINVAL;
return -1;
}
SIGNAL_LOCK();
sa = &__sig_act[signum];
if (oact != NULL)
*oact = *sa;
if (act != NULL)
*sa = *act;
/* Discard pending signal in some cases */
if (sa->sa_handler == SIG_IGN ||
(sa->sa_handler == SIG_DFL && signum == SIGCHLD))
__sig_pending &= ~sigmask(signum);
SIGNAL_UNLOCK();
/* Process pending signal */
__sig_flush();
return 0;
}