siginterrupt.c revision 1.8 
1/*	$NetBSD: siginterrupt.c,v 1.8 1997/07/13 19:46:16 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#if defined(LIBC_SCCS) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)siginterrupt.c	8.1 (Berkeley) 6/4/93";
40#else
41__RCSID("$NetBSD: siginterrupt.c,v 1.8 1997/07/13 19:46:16 christos Exp $");
42#endif
43#endif /* LIBC_SCCS and not lint */
44
45#include <signal.h>
46
47/*
48 * Set signal state to prevent restart of system calls
49 * after an instance of the indicated signal.
50 */
51int
52siginterrupt(sig, flag)
53	int sig, flag;
54{
55	extern sigset_t __sigintr;
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