1 /* $OpenBSD: uthread_sigaction.c,v 1.8 2003/09/22 21:39:35 miod Exp $ */
2 /*
3 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by John Birrell.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: uthread_sigaction.c,v 1.8 1999/08/28 00:03:48 peter Exp $
34 */
35 #include <signal.h>
36 #include <errno.h>
37 #ifdef _THREAD_SAFE
38 #include <pthread.h>
39 #include "pthread_private.h"
40
41 int
sigaction(int sig,const struct sigaction * act,struct sigaction * oact)42 sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
43 {
44 int ret = 0;
45 struct sigaction gact;
46
47 /* Check if the signal number is out of range: */
48 if (sig < 1 || sig >= NSIG) {
49 /* Return an invalid argument: */
50 errno = EINVAL;
51 ret = -1;
52 } else {
53 /*
54 * Check if the existing signal action structure contents are
55 * to be returned:
56 */
57 if (oact != NULL) {
58 /* Return the existing signal action contents: */
59 oact->sa_handler = _thread_sigact[sig - 1].sa_handler;
60 oact->sa_mask = _thread_sigact[sig - 1].sa_mask;
61 oact->sa_flags = _thread_sigact[sig - 1].sa_flags;
62 }
63
64 /* Check if a signal action was supplied: */
65 if (act != NULL) {
66 /* Set the new signal handler: */
67 _thread_sigact[sig - 1].sa_mask = act->sa_mask;
68 _thread_sigact[sig - 1].sa_flags = act->sa_flags;
69 _thread_sigact[sig - 1].sa_handler = act->sa_handler;
70 }
71
72 /*
73 * Check if the kernel needs to be advised of a change
74 * in signal action:
75 */
76 if (act != NULL && sig != _SCHED_SIGNAL && sig != SIGCHLD &&
77 sig != SIGINFO) {
78 gact.sa_mask = act->sa_mask;
79 sigaddset(&gact.sa_mask, _SCHED_SIGNAL);
80 gact.sa_flags = act->sa_flags | SA_SIGINFO;
81
82 /*
83 * Check if the signal handler is being set to
84 * the default or ignore handlers:
85 */
86 if (act->sa_handler == SIG_DFL ||
87 act->sa_handler == SIG_IGN)
88 /* Specify the built in handler: */
89 gact.sa_handler = act->sa_handler;
90 else
91 /* Specify the thread kernel signal handler */
92 gact.sa_handler =
93 (void (*) (int)) _thread_sig_handler;
94
95 /* Change the signal action in the kernel: */
96 if (_thread_sys_sigaction(sig, &gact, NULL) != 0)
97 ret = -1;
98 }
99 }
100
101 /* Return the completion status: */
102 return (ret);
103 }
104 #endif
105