96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
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/* $NetBSD: sigset.c,v 1.2 2008/04/28 20:22:59 martin Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: sigset.c,v 1.2 2008/04/28 20:22:59 martin Exp $");
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#endif
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#include "namespace.h"
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#include <errno.h>
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#include <signal.h>
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#include <stddef.h>
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sig_t
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sigset(int sig, void (*disp)(int))
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{
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sigset_t set, oset;
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struct sigaction sa, osa;
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osa.sa_handler = SIG_ERR;
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if (disp == SIG_HOLD) {
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/* Add sig to current signal mask. */
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if (sigemptyset(&set) != 0)
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goto out;
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if (sigaddset(&set, sig) != 0)
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goto out;
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if (sigprocmask(SIG_BLOCK, &set, &oset) != 0)
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goto out;
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if (sigismember(&oset, sig)) {
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/* Had been masked before, return SIG_HOLD. */
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osa.sa_handler = SIG_HOLD;
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} else {
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/* Return previous disposition. */
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(void)sigaction(sig, NULL, &osa);
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}
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} else if (disp == SIG_ERR) {
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errno = EINVAL;
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} else {
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/* Set up and install new disposition. */
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sa.sa_handler = disp;
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if (sigemptyset(&sa.sa_mask) != 0)
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goto out;
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sa.sa_flags = 0;
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if (sigaction(sig, &sa, &osa) != 0) {
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osa.sa_handler = SIG_ERR;
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goto out;
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}
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/* Delete sig from current signal mask. */
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if (sigemptyset(&set) != 0)
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return (SIG_ERR);
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if (sigaddset(&set, sig) != 0)
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return (SIG_ERR);
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if (sigprocmask(SIG_UNBLOCK, &set, &oset) != 0)
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return (SIG_ERR);
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/* If had been masked before, return SIG_HOLD. */
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if (sigismember(&oset, sig))
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osa.sa_handler = SIG_HOLD;
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}
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out:
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return (osa.sa_handler);
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}
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