2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "pthread_private.h"
36 __weak_reference(_sigaction, sigaction);
39 _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
42 struct sigaction gact;
44 /* Check if the signal number is out of range: */
45 if (sig < 1 || sig > NSIG) {
46 /* Return an invalid argument: */
50 if (_thread_initial == NULL)
54 * Check if the existing signal action structure contents are
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;
64 /* Check if a signal action was supplied: */
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;
73 * Check if the kernel needs to be advised of a change
76 if (act != NULL && sig != _SCHED_SIGNAL && sig != SIGCHLD &&
79 * Ensure the signal handler cannot be interrupted
80 * by other signals. Always request the POSIX signal
83 sigfillset(&gact.sa_mask);
84 gact.sa_flags = SA_SIGINFO | SA_RESTART;
87 * Check if the signal handler is being set to
88 * the default or ignore handlers:
90 if (act->sa_handler == SIG_DFL ||
91 act->sa_handler == SIG_IGN)
92 /* Specify the built in handler: */
93 gact.sa_handler = act->sa_handler;
96 * Specify the thread kernel signal
99 gact.sa_handler = (void (*) ()) _thread_sig_handler;
101 /* Change the signal action in the kernel: */
102 if (__sys_sigaction(sig,&gact,NULL) != 0)
107 /* Return the completion status: */