siginterrupt.c revision 1.9 
11.9Sjtc/*	$NetBSD: siginterrupt.c,v 1.9 1997/07/21 14:07:32 jtc Exp $	*/
21.5Scgd
31.1Scgd/*
41.5Scgd * Copyright (c) 1989, 1993
51.5Scgd *	The Regents of the University of California.  All rights reserved.
61.1Scgd *
71.1Scgd * Redistribution and use in source and binary forms, with or without
81.1Scgd * modification, are permitted provided that the following conditions
91.1Scgd * are met:
101.1Scgd * 1. Redistributions of source code must retain the above copyright
111.1Scgd *    notice, this list of conditions and the following disclaimer.
121.1Scgd * 2. Redistributions in binary form must reproduce the above copyright
131.1Scgd *    notice, this list of conditions and the following disclaimer in the
141.1Scgd *    documentation and/or other materials provided with the distribution.
151.1Scgd * 3. All advertising materials mentioning features or use of this software
161.1Scgd *    must display the following acknowledgement:
171.1Scgd *	This product includes software developed by the University of
181.1Scgd *	California, Berkeley and its contributors.
191.1Scgd * 4. Neither the name of the University nor the names of its contributors
201.1Scgd *    may be used to endorse or promote products derived from this software
211.1Scgd *    without specific prior written permission.
221.1Scgd *
231.1Scgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
241.1Scgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
251.1Scgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
261.1Scgd * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
271.1Scgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
281.1Scgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
291.1Scgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
301.1Scgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
311.1Scgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
321.1Scgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
331.1Scgd * SUCH DAMAGE.
341.1Scgd */
351.1Scgd
361.8Schristos#include <sys/cdefs.h>
371.1Scgd#if defined(LIBC_SCCS) && !defined(lint)
381.5Scgd#if 0
391.5Scgdstatic char sccsid[] = "@(#)siginterrupt.c	8.1 (Berkeley) 6/4/93";
401.5Scgd#else
411.9Sjtc__RCSID("$NetBSD: siginterrupt.c,v 1.9 1997/07/21 14:07:32 jtc Exp $");
421.5Scgd#endif
431.1Scgd#endif /* LIBC_SCCS and not lint */
441.1Scgd
451.9Sjtc#include "namespace.h"
461.1Scgd#include <signal.h>
471.9Sjtc
481.9Sjtc#ifdef __weak_alias
491.9Sjtc__weak_alias(siginterrupt,_siginterrupt);
501.9Sjtc#endif
511.1Scgd
521.1Scgd/*
531.1Scgd * Set signal state to prevent restart of system calls
541.1Scgd * after an instance of the indicated signal.
551.1Scgd */
561.7Sjtcint
571.1Scgdsiginterrupt(sig, flag)
581.1Scgd	int sig, flag;
591.1Scgd{
601.4Sjtc	extern sigset_t __sigintr;
611.1Scgd	struct sigaction sa;
621.1Scgd	int ret;
631.1Scgd
641.1Scgd	if ((ret = sigaction(sig, (struct sigaction *)0, &sa)) < 0)
651.1Scgd		return (ret);
661.1Scgd	if (flag) {
671.4Sjtc		sigaddset(&__sigintr, sig);
681.1Scgd		sa.sa_flags &= ~SA_RESTART;
691.1Scgd	} else {
701.4Sjtc		sigdelset(&__sigintr, sig);
711.1Scgd		sa.sa_flags |= SA_RESTART;
721.1Scgd	}
731.1Scgd	return (sigaction(sig, &sa, (struct sigaction *)0));
741.1Scgd}
75