Annotation of src/lib/libc/gen/sigset.c, Revision 1.2
1.2 ! martin 1: /* $NetBSD: sigset.c,v 1.1 2003/01/15 23:55:43 kleink Exp $ */
1.1 kleink 2:
3: /*-
4: * Copyright (c) 2003 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Klaus Klein.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
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.
18: *
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.
30: */
31:
32: #include <sys/cdefs.h>
33: #if defined(LIBC_SCCS) && !defined(lint)
1.2 ! martin 34: __RCSID("$NetBSD: sigset.c,v 1.1 2003/01/15 23:55:43 kleink Exp $");
1.1 kleink 35: #endif
36:
37: #include "namespace.h"
38: #include <errno.h>
39: #include <signal.h>
40: #include <stddef.h>
41:
42: sig_t
43: sigset(int sig, void (*disp)(int))
44: {
45: sigset_t set, oset;
46: struct sigaction sa, osa;
47:
48: osa.sa_handler = SIG_ERR;
49:
50: if (disp == SIG_HOLD) {
51: /* Add sig to current signal mask. */
52: if (sigemptyset(&set) != 0)
53: goto out;
54: if (sigaddset(&set, sig) != 0)
55: goto out;
56: if (sigprocmask(SIG_BLOCK, &set, &oset) != 0)
57: goto out;
58:
59: if (sigismember(&oset, sig)) {
60: /* Had been masked before, return SIG_HOLD. */
61: osa.sa_handler = SIG_HOLD;
62: } else {
63: /* Return previous disposition. */
64: (void)sigaction(sig, NULL, &osa);
65: }
66: } else if (disp == SIG_ERR) {
67: errno = EINVAL;
68: } else {
69: /* Set up and install new disposition. */
70: sa.sa_handler = disp;
71: if (sigemptyset(&sa.sa_mask) != 0)
72: goto out;
73: sa.sa_flags = 0;
74:
75: if (sigaction(sig, &sa, &osa) != 0) {
76: osa.sa_handler = SIG_ERR;
77: goto out;
78: }
79:
80: /* Delete sig from current signal mask. */
81: if (sigemptyset(&set) != 0)
82: return (SIG_ERR);
83: if (sigaddset(&set, sig) != 0)
84: return (SIG_ERR);
85: if (sigprocmask(SIG_UNBLOCK, &set, &oset) != 0)
86: return (SIG_ERR);
87:
88: /* If had been masked before, return SIG_HOLD. */
89: if (sigismember(&oset, sig))
90: osa.sa_handler = SIG_HOLD;
91: }
92:
93: out:
94: return (osa.sa_handler);
95: }
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