1 /* $NetBSD: signal.c,v 1.16 2024/01/03 18:41:53 christos Exp $ */
2
3 /*
4 * Copyright (c) 1985, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 #if 0
35 static char sccsid[] = "@(#)signal.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: signal.c,v 1.16 2024/01/03 18:41:53 christos Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 /*
42 * Almost backwards compatible signal.
43 */
44 #include "namespace.h"
45 #include "extern.h"
46 #include <signal.h>
47
48 #ifdef __weak_alias
__weak_alias(signal,_signal)49 __weak_alias(signal,_signal)
50 #endif
51
52 sigset_t __sigintr; /* shared with siginterrupt */
53
54 sig_t
55 signal(int s, sig_t a)
56 {
57 struct sigaction sa, osa;
58
59 sa.sa_handler = a;
60 sigemptyset(&sa.sa_mask);
61 sa.sa_flags = 0;
62 if (!sigismember(&__sigintr, s))
63 sa.sa_flags |= SA_RESTART;
64 if (sigaction(s, &sa, &osa) < 0)
65 return (SIG_ERR);
66 return (osa.sa_handler);
67 }
68
69 void
bsd_signal(int sig,void (* func)(int))70 (*bsd_signal(int sig, void (*func)(int)))(int)
71 {
72 struct sigaction act, oact;
73
74 act.sa_handler = func;
75 act.sa_flags = SA_RESTART;
76
77 sigemptyset(&act.sa_mask);
78 sigaddset(&act.sa_mask, sig);
79 if (sigaction(sig, &act, &oact) < 0)
80 return (SIG_ERR);
81
82 return (oact.sa_handler);
83 }
84