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
32 * $FreeBSD: src/lib/libc_r/uthread/uthread_sigaction.c,v 1.11.2.3 2002/10/22 14:44:03 fjoe Exp $
33 * $DragonFly: src/lib/libc_r/uthread/uthread_sigaction.c,v 1.2 2003/06/17 04:26:48 dillon Exp $
38 #include "pthread_private.h"
41 _sigaction(int sig
, const struct sigaction
* act
, struct sigaction
* oact
)
44 struct sigaction gact
;
46 /* Check if the signal number is out of range: */
47 if (sig
< 1 || sig
> NSIG
) {
48 /* Return an invalid argument: */
52 if (_thread_initial
== NULL
)
56 * Check if the existing signal action structure contents are
60 /* Return the existing signal action contents: */
61 oact
->sa_handler
= _thread_sigact
[sig
- 1].sa_handler
;
62 oact
->sa_mask
= _thread_sigact
[sig
- 1].sa_mask
;
63 oact
->sa_flags
= _thread_sigact
[sig
- 1].sa_flags
;
66 /* Check if a signal action was supplied: */
68 /* Set the new signal handler: */
69 _thread_sigact
[sig
- 1].sa_mask
= act
->sa_mask
;
70 _thread_sigact
[sig
- 1].sa_flags
= act
->sa_flags
;
71 _thread_sigact
[sig
- 1].sa_handler
= act
->sa_handler
;
75 * Check if the kernel needs to be advised of a change
78 if (act
!= NULL
&& sig
!= _SCHED_SIGNAL
&& sig
!= SIGCHLD
&&
81 * Ensure the signal handler cannot be interrupted
82 * by other signals. Always request the POSIX signal
85 sigfillset(&gact
.sa_mask
);
86 gact
.sa_flags
= SA_SIGINFO
| SA_RESTART
;
89 * Check if the signal handler is being set to
90 * the default or ignore handlers:
92 if (act
->sa_handler
== SIG_DFL
||
93 act
->sa_handler
== SIG_IGN
)
94 /* Specify the built in handler: */
95 gact
.sa_handler
= act
->sa_handler
;
98 * Specify the thread kernel signal
101 gact
.sa_handler
= (void (*) ()) _thread_sig_handler
;
103 /* Change the signal action in the kernel: */
104 if (__sys_sigaction(sig
,&gact
,NULL
) != 0)
109 /* Return the completion status: */
113 __strong_reference(_sigaction
, sigaction
);