1 /* $NetBSD: sigset.c,v 1.2 2008/04/28 20:22:59 martin Exp $ */
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: sigset.c,v 1.2 2008/04/28 20:22:59 martin Exp $");
37 #include "namespace.h"
43 sigset(int sig
, void (*disp
)(int))
46 struct sigaction sa
, osa
;
48 osa
.sa_handler
= SIG_ERR
;
50 if (disp
== SIG_HOLD
) {
51 /* Add sig to current signal mask. */
52 if (sigemptyset(&set
) != 0)
54 if (sigaddset(&set
, sig
) != 0)
56 if (sigprocmask(SIG_BLOCK
, &set
, &oset
) != 0)
59 if (sigismember(&oset
, sig
)) {
60 /* Had been masked before, return SIG_HOLD. */
61 osa
.sa_handler
= SIG_HOLD
;
63 /* Return previous disposition. */
64 (void)sigaction(sig
, NULL
, &osa
);
66 } else if (disp
== SIG_ERR
) {
69 /* Set up and install new disposition. */
71 if (sigemptyset(&sa
.sa_mask
) != 0)
75 if (sigaction(sig
, &sa
, &osa
) != 0) {
76 osa
.sa_handler
= SIG_ERR
;
80 /* Delete sig from current signal mask. */
81 if (sigemptyset(&set
) != 0)
83 if (sigaddset(&set
, sig
) != 0)
85 if (sigprocmask(SIG_UNBLOCK
, &set
, &oset
) != 0)
88 /* If had been masked before, return SIG_HOLD. */
89 if (sigismember(&oset
, sig
))
90 osa
.sa_handler
= SIG_HOLD
;
94 return (osa
.sa_handler
);