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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 <sys/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;

}