1 /* $OpenBSD: signal.c,v 1.11 2019/06/28 13:32:41 deraadt Exp $ */
2 /*
3 * Copyright (c) 1985, 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 /*
32 * Almost backwards compatible signal.
33 */
34 #include <signal.h>
35 #include <string.h>
36
37 sigset_t __sigintr; /* shared with siginterrupt */
38
39 sig_t
signal(int s,sig_t a)40 signal(int s, sig_t a)
41 {
42 struct sigaction sa, osa;
43
44 memset(&sa, 0, sizeof sa);
45 sa.sa_handler = a;
46 sigemptyset(&sa.sa_mask);
47 sa.sa_flags = 0;
48 if (!sigismember(&__sigintr, s))
49 sa.sa_flags |= SA_RESTART;
50 if (WRAP(sigaction)(s, &sa, &osa) == -1)
51 return (SIG_ERR);
52 return (osa.sa_handler);
53 }
54
55 __weak_alias(bsd_signal, signal);
56