1 /* $OpenBSD: uthread_sigmask.c,v 1.7 2003/07/08 00:17:19 marc Exp $ */
2 /*
3 * Copyright (c) 1997 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_sigmask.c,v 1.5 1999/09/29 15:18:40 marcel Exp $
34 */
35 #include <errno.h>
36 #include <signal.h>
37 #ifdef _THREAD_SAFE
38 #include <pthread.h>
39 #include "pthread_private.h"
40
41 int
pthread_sigmask(int how,const sigset_t * set,sigset_t * oset)42 pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
43 {
44 struct pthread *curthread = _get_curthread();
45 sigset_t sigset;
46 int ret = 0;
47
48 /* Check if the existing signal process mask is to be returned: */
49 if (oset != NULL) {
50 /* Return the current mask: */
51 *oset = curthread->sigmask;
52 }
53 /* Check if a new signal set was provided by the caller: */
54 if (set != NULL) {
55 /* Process according to what to do: */
56 switch (how) {
57 /* Block signals: */
58 case SIG_BLOCK:
59 /* Add signals to the existing mask: */
60 curthread->sigmask |= *set;
61 break;
62
63 /* Unblock signals: */
64 case SIG_UNBLOCK:
65 /* Clear signals from the existing mask: */
66 curthread->sigmask &= ~(*set);
67 break;
68
69 /* Set the signal process mask: */
70 case SIG_SETMASK:
71 /* Set the new mask: */
72 curthread->sigmask = *set;
73 break;
74
75 /* Trap invalid actions: */
76 default:
77 /* Return an invalid argument: */
78 errno = EINVAL;
79 ret = -1;
80 break;
81 }
82
83 /*
84 * Check if there are pending signals for the running
85 * thread or process that aren't blocked:
86 */
87 sigset = curthread->sigpend;
88 sigset |= _process_sigpending;
89 sigset &= ~curthread->sigmask;
90 if (sigset != 0)
91 /*
92 * Call the kernel scheduler which will safely
93 * install a signal frame for the running thread:
94 */
95 _thread_kern_sched(NULL);
96 }
97
98 /* Return the completion status: */
99 return (ret);
100 }
101 #endif
102