libc/gen/signal.c

1.11   mycroft /*	$NetBSD: signal.c,v 1.11 2000/01/22 22:19:12 mycroft Exp $	*/
 1.6       cgd
 1.1       cgd /*
 1.6       cgd  * Copyright (c) 1985, 1989, 1993
 1.6       cgd  *	The Regents of the University of California.  All rights reserved.
 1.1       cgd  *
 1.1       cgd  * Redistribution and use in source and binary forms, with or without
 1.1       cgd  * modification, are permitted provided that the following conditions
 1.1       cgd  * are met:
 1.1       cgd  * 1. Redistributions of source code must retain the above copyright
 1.1       cgd  *    notice, this list of conditions and the following disclaimer.
 1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
 1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
 1.1       cgd  *    documentation and/or other materials provided with the distribution.
 1.1       cgd  * 3. All advertising materials mentioning features or use of this software
 1.1       cgd  *    must display the following acknowledgement:
 1.1       cgd  *	This product includes software developed by the University of
 1.1       cgd  *	California, Berkeley and its contributors.
 1.1       cgd  * 4. Neither the name of the University nor the names of its contributors
 1.1       cgd  *    may be used to endorse or promote products derived from this software
 1.1       cgd  *    without specific prior written permission.
 1.1       cgd  *
 1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 1.1       cgd  * SUCH DAMAGE.
 1.1       cgd  */
 1.1       cgd
 1.8  christos #include <sys/cdefs.h>
 1.1       cgd #if defined(LIBC_SCCS) && !defined(lint)
 1.6       cgd #if 0
 1.6       cgd static char sccsid[] = "@(#)signal.c	8.1 (Berkeley) 6/4/93";
 1.6       cgd #else
1.11   mycroft __RCSID("$NetBSD: signal.c,v 1.11 2000/01/22 22:19:12 mycroft Exp $");
 1.6       cgd #endif
 1.1       cgd #endif /* LIBC_SCCS and not lint */
 1.1       cgd
 1.1       cgd /*
 1.1       cgd  * Almost backwards compatible signal.
 1.1       cgd  */
 1.9       jtc #include "namespace.h"
 1.1       cgd #include <signal.h>
1.10    kleink
1.10    kleink #ifdef __weak_alias
1.11   mycroft __weak_alias(signal,_signal)
1.10    kleink #endif
 1.1       cgd
 1.5       jtc sigset_t __sigintr;		/* shared with siginterrupt */
 1.1       cgd
 1.1       cgd sig_t
 1.1       cgd signal(s, a)
 1.1       cgd 	int s;
 1.1       cgd 	sig_t a;
 1.1       cgd {
 1.1       cgd 	struct sigaction sa, osa;
 1.1       cgd
 1.1       cgd 	sa.sa_handler = a;
 1.1       cgd 	sigemptyset(&sa.sa_mask);
 1.1       cgd 	sa.sa_flags = 0;
 1.5       jtc 	if (!sigismember(&__sigintr, s))
 1.1       cgd 		sa.sa_flags |= SA_RESTART;
 1.1       cgd 	if (sigaction(s, &sa, &osa) < 0)
 1.2       jtc 		return (SIG_ERR);
 1.1       cgd 	return (osa.sa_handler);
 1.1       cgd }