xref: /minix3/lib/libc/arch/powerpc/sys/__sigaction14_sigtramp.c (revision 2fe8fb192fe7e8720e3e7a77f928da545e872a6a)
1 /*	$NetBSD: __sigaction14_sigtramp.c,v 1.9 2008/04/28 20:22:57 martin Exp $	*/
2 
3 /*-
4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jason R. Thorpe.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: __sigaction14_sigtramp.c,v 1.9 2008/04/28 20:22:57 martin Exp $");
35 #endif /* LIBC_SCCS and not lint */
36 
37 #include <sys/types.h>
38 #include <stddef.h>
39 #include <signal.h>
40 #include <errno.h>
41 
42 #include "extern.h"
43 
44 __weak_alias(__sigaction14, __libc_sigaction14)
45 #ifdef __LIBC12_SOURCE__
46 extern const int __sigtramp_sigcontext_1[]
47     __weak_reference(__sigtramp_sigcontext_1);
48 #endif
49 
50 int
__libc_sigaction14(int sig,const struct sigaction * act,struct sigaction * oact)51 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact)
52 {
53 	extern const int __sigtramp_siginfo_2[];
54 
55 	/*
56 	 * If no sigaction, use the "default" trampoline since it won't
57 	 * be used.
58 	 */
59 	if (act == NULL)
60 		return  __sigaction_sigtramp(sig, act, oact, NULL, 0);
61 
62 #ifdef __LIBC12_SOURCE__
63 	/*
64 	 * We select the non-SA_SIGINFO trampoline if SA_SIGINFO is not
65 	 * set in the sigaction.
66 	 */
67 	if ((act->sa_flags & SA_SIGINFO) == 0) {
68 		int sav = errno;
69 		int rv =  __sigaction_sigtramp(sig, act, oact,
70 		    __sigtramp_sigcontext_1, 1);
71 		if (rv >= 0 || errno != EINVAL)
72 			return rv;
73 		errno = sav;
74 	}
75 #endif
76 
77 	/*
78 	 * If SA_SIGINFO was specificed or the compatibility trampolines
79 	 * can't be used, use the siginfo trampoline.
80 	 */
81 	return __sigaction_sigtramp(sig, act, oact, __sigtramp_siginfo_2, 2);
82 }
83