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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include "pthread_private.h"
39 __weak_reference(_sigaction, sigaction);
42 _sigaction(int sig, const struct sigaction * act, struct sigaction * oact)
45 struct sigaction gact;
47 /* Check if the signal number is out of range: */
48 if (sig < 1 || sig > NSIG) {
49 /* Return an invalid argument: */
53 if (_thread_initial == NULL)
57 * Check if the existing signal action structure contents are
61 /* Return the existing signal action contents: */
62 oact->sa_handler = _thread_sigact[sig - 1].sa_handler;
63 oact->sa_mask = _thread_sigact[sig - 1].sa_mask;
64 oact->sa_flags = _thread_sigact[sig - 1].sa_flags;
67 /* Check if a signal action was supplied: */
69 /* Set the new signal handler: */
70 _thread_sigact[sig - 1].sa_mask = act->sa_mask;
71 _thread_sigact[sig - 1].sa_flags = act->sa_flags;
72 _thread_sigact[sig - 1].sa_handler = act->sa_handler;
76 * Check if the kernel needs to be advised of a change
79 if (act != NULL && sig != _SCHED_SIGNAL && sig != SIGCHLD &&
82 * Ensure the signal handler cannot be interrupted
83 * by other signals. Always request the POSIX signal
86 sigfillset(&gact.sa_mask);
87 gact.sa_flags = SA_SIGINFO | SA_RESTART;
90 * Check if the signal handler is being set to
91 * the default or ignore handlers:
93 if (act->sa_handler == SIG_DFL ||
94 act->sa_handler == SIG_IGN)
95 /* Specify the built in handler: */
96 gact.sa_handler = act->sa_handler;
99 * Specify the thread kernel signal
102 gact.sa_handler = (void (*) ()) _thread_sig_handler;
104 /* Change the signal action in the kernel: */
105 if (__sys_sigaction(sig,&gact,NULL) != 0)
110 /* Return the completion status: */