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Annotation of prex-old/usr/lib/posix/signal/signal.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2005, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #include <signal.h>
        !            31: #include <errno.h>
        !            32: #include <stdlib.h>
        !            33:
        !            34: sig_t
        !            35: signal(int sig, sig_t handler)
        !            36: {
        !            37:        int err;
        !            38:        struct sigaction act, oact;
        !            39:
        !            40:        if (sig <= 0 || sig >= NSIG || sig == SIGSTOP || sig == SIGKILL) {
        !            41:                errno = EINVAL;
        !            42:                return SIG_ERR;
        !            43:        }
        !            44:
        !            45:        act.sa_handler = handler;
        !            46:        act.sa_flags = 0;
        !            47:        act.sa_mask = 0;
        !            48:        if (handler != SIG_IGN && handler != SIG_DFL)
        !            49:                act.sa_mask = sigmask(sig);
        !            50:
        !            51:        err = sigaction(sig, &act, &oact);
        !            52:        if (err)
        !            53:                return SIG_ERR;
        !            54:        return oact.sa_handler;
        !            55: }