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Annotation of prex-old/usr/lib/posix/signal/sigaction.c, Revision 1.1.1.1

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: }