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/*
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 * Copyright (c) 2005, Kohsuke Ohtani
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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 THE AUTHOR 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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#include <sys/signal.h>
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#include <stddef.h>
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#include <signal.h>
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#include <errno.h>
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/*
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 * If act is not NULL, set the action for signum.
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 * If oact is not NULL. store the old action to oact.
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 */
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int
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sigaction(int signum, const struct sigaction *act, struct sigaction *oact)
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{
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        struct sigaction *sa;
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        if (signum <= 0 || signum >= NSIG ||
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            signum == SIGSTOP || signum == SIGKILL) {
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                errno = EINVAL;
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                return -1;
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        }
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        SIGNAL_LOCK();
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        sa = &__sig_act[signum];
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        if (oact != NULL)
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                *oact = *sa;
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        if (act != NULL)
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                *sa = *act;
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        /* Discard pending signal in some cases */
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        if (sa->sa_handler == SIG_IGN ||
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            (sa->sa_handler == SIG_DFL && signum == SIGCHLD))
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                __sig_pending &= ~sigmask(signum);
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        SIGNAL_UNLOCK();
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        /* Process pending signal */
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        __sig_flush();
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        return 0;
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}