Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / siginterrupt.c
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1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD: src/lib/libc/gen/siginterrupt.c,v 1.2.8.1 2001/03/05 09:34:53 obrien Exp $
0f52d283 34 * $DragonFly: src/lib/libc/gen/siginterrupt.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
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35 *
36 * @(#)siginterrupt.c 8.1 (Berkeley) 6/4/93
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37 */
38
17ea2221 39#include "namespace.h"
984263bc 40#include <signal.h>
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41#include "un-namespace.h"
42#include "libc_private.h"
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43
44/*
45 * Set signal state to prevent restart of system calls
46 * after an instance of the indicated signal.
47 */
48int
0f52d283 49siginterrupt(int sig, int flag)
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50{
51 extern sigset_t _sigintr;
52 struct sigaction sa;
53 int ret;
54
17ea2221 55 if ((ret = _sigaction(sig, (struct sigaction *)0, &sa)) < 0)
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56 return (ret);
57 if (flag) {
58 sigaddset(&_sigintr, sig);
59 sa.sa_flags &= ~SA_RESTART;
60 } else {
61 sigdelset(&_sigintr, sig);
62 sa.sa_flags |= SA_RESTART;
63 }
17ea2221 64 return (_sigaction(sig, &sa, (struct sigaction *)0));
984263bc 65}