1 /* $NetBSD: __sigaction14_sigtramp.c,v 1.8 2008/04/28 20:22:57 martin Exp $ */
2
3 /*-
4 * Copyright (c) 2003 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 2008/04/28 20:22:57 martin Exp $");
35 #endif /* LIBC_SCCS and not lint */
36
37 #include <sys/types.h>
38 #include <signal.h>
39 #include <errno.h>
40
41 #include "extern.h"
42
43 __weak_alias(__sigaction14, __libc_sigaction14)
44 #ifdef __LIBC12_SOURCE__
45 extern const int __sigtramp_sigcontext_1[]
46 __weak_reference(__sigtramp_sigcontext_1);
47 #endif
48
49 int
__libc_sigaction14(int sig,const struct sigaction * act,struct sigaction * oact)50 __libc_sigaction14(int sig, const struct sigaction *act, struct sigaction *oact)
51 {
52 extern int __sigtramp_siginfo_2[];
53
54 #ifdef __LIBC12_SOURCE__
55 /*
56 * We select the compatibility SIGCONTEXT trampoline if SA_SIGINFO
57 * is not set in the sigaction.
58 */
59 if (act && (act->sa_flags & SA_SIGINFO) == 0) {
60 extern int __sigtramp_sigcontext_1[];
61 int sav = errno;
62 int rv = __sigaction_sigtramp(sig, act, oact,
63 __sigtramp_sigcontext_1, 1);
64 /*
65 * EINVAL might indicate that trampoline version 1 is
66 * not supported by the kernel; fall back on native
67 * SIGINFO trampoline.
68 */
69 if (rv >= 0 || errno != EINVAL)
70 return rv;
71 errno = sav;
72 }
73 #endif
74
75 return __sigaction_sigtramp(sig, act, oact, __sigtramp_siginfo_2, 2);
76 }
77