Annotation of prex/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: }
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