siginterrupt.c revision 1.14 
1/*	$NetBSD: siginterrupt.c,v 1.14 2024/01/03 18:41:53 christos Exp $	*/
2
3/*
4 * Copyright (c) 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
35static char sccsid[] = "@(#)siginterrupt.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: siginterrupt.c,v 1.14 2024/01/03 18:41:53 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include "extern.h"
43#include <signal.h>
44
45#ifdef __weak_alias
46__weak_alias(siginterrupt,_siginterrupt)
47#endif
48
49/*
50 * Set signal state to prevent restart of system calls
51 * after an instance of the indicated signal.
52 */
53int
54siginterrupt(int sig, int flag)
55{
56	struct sigaction sa;
57	int ret;
58
59	if ((ret = sigaction(sig, (struct sigaction *)0, &sa)) < 0)
60		return (ret);
61	if (flag) {
62		sigaddset(&__sigintr, sig);
63		sa.sa_flags &= ~SA_RESTART;
64	} else {
65		sigdelset(&__sigintr, sig);
66		sa.sa_flags |= SA_RESTART;
67	}
68	return (sigaction(sig, &sa, (struct sigaction *)0));
69}
70