Return to sigaction.c CVS log

Up to [local] / prex-old / usr / lib / posix / signal

Annotation of prex-old/usr/lib/posix/signal/sigaction.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 <prex/signal.h>
        !            31:
        !            32: #include <stddef.h>
        !            33: #include <signal.h>
        !            34: #include <errno.h>
        !            35:
        !            36: /*
        !            37:  * If act is not NULL, set the action for signum.
        !            38:  * If oact is not NULL. store the old action to oact.
        !            39:  */
        !            40: int
        !            41: sigaction(int signum, const struct sigaction *act, struct sigaction *oact)
        !            42: {
        !            43:        struct sigaction *sa;
        !            44:
        !            45:        if (signum <= 0 || signum >= NSIG ||
        !            46:            signum == SIGSTOP || signum == SIGKILL) {
        !            47:                errno = EINVAL;
        !            48:                return -1;
        !            49:        }
        !            50:
        !            51:        SIGNAL_LOCK();
        !            52:
        !            53:        sa = &__sig_act[signum];
        !            54:
        !            55:        if (oact != NULL)
        !            56:                *oact = *sa;
        !            57:
        !            58:        if (act != NULL)
        !            59:                *sa = *act;
        !            60:
        !            61:        /* Discard pending signal in some cases */
        !            62:        if (sa->sa_handler == SIG_IGN ||
        !            63:            (sa->sa_handler == SIG_DFL && signum == SIGCHLD))
        !            64:                __sig_pending &= ~sigmask(signum);
        !            65:
        !            66:        SIGNAL_UNLOCK();
        !            67:
        !            68:        /* Process pending signal */
        !            69:        __sig_flush();
        !            70:
        !            71:        return 0;
        !            72: }