1/*	$NetBSD: __sigaction14_sigtramp.c,v 1.8 2006/05/18 17:54:19 christos 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 1.8 2006/05/18 17:54:19 christos 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__
46extern const int __sigtramp_sigcontext_1[]
47    __weak_reference(__sigtramp_sigcontext_1);
48#endif
49
50int
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