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signal.c revision 1.6 
      1  1.6  cgd /*	$NetBSD: signal.c,v 1.6 1995/02/27 05:51:17 cgd Exp $	*/
      2  1.6  cgd 
      3  1.1  cgd /*
      4  1.6  cgd  * Copyright (c) 1985, 1989, 1993
      5  1.6  cgd  *	The Regents of the University of California.  All rights reserved.
      6  1.1  cgd  *
      7  1.1  cgd  * Redistribution and use in source and binary forms, with or without
      8  1.1  cgd  * modification, are permitted provided that the following conditions
      9  1.1  cgd  * are met:
     10  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
     11  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     12  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     14  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     15  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     16  1.1  cgd  *    must display the following acknowledgement:
     17  1.1  cgd  *	This product includes software developed by the University of
     18  1.1  cgd  *	California, Berkeley and its contributors.
     19  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     20  1.1  cgd  *    may be used to endorse or promote products derived from this software
     21  1.1  cgd  *    without specific prior written permission.
     22  1.1  cgd  *
     23  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.1  cgd  * SUCH DAMAGE.
     34  1.1  cgd  */
     35  1.1  cgd 
     36  1.1  cgd #if defined(LIBC_SCCS) && !defined(lint)
     37  1.6  cgd #if 0
     38  1.6  cgd static char sccsid[] = "@(#)signal.c	8.1 (Berkeley) 6/4/93";
     39  1.6  cgd #else
     40  1.6  cgd static char rcsid[] = "$NetBSD";
     41  1.6  cgd #endif
     42  1.1  cgd #endif /* LIBC_SCCS and not lint */
     43  1.1  cgd 
     44  1.1  cgd /*
     45  1.1  cgd  * Almost backwards compatible signal.
     46  1.1  cgd  */
     47  1.1  cgd #include <signal.h>
     48  1.1  cgd 
     49  1.5  jtc sigset_t __sigintr;		/* shared with siginterrupt */
     50  1.1  cgd 
     51  1.1  cgd sig_t
     52  1.1  cgd signal(s, a)
     53  1.1  cgd 	int s;
     54  1.1  cgd 	sig_t a;
     55  1.1  cgd {
     56  1.1  cgd 	struct sigaction sa, osa;
     57  1.1  cgd 
     58  1.1  cgd 	sa.sa_handler = a;
     59  1.1  cgd 	sigemptyset(&sa.sa_mask);
     60  1.1  cgd 	sa.sa_flags = 0;
     61  1.5  jtc 	if (!sigismember(&__sigintr, s))
     62  1.1  cgd 		sa.sa_flags |= SA_RESTART;
     63  1.1  cgd 	if (sigaction(s, &sa, &osa) < 0)
     64  1.2  jtc 		return (SIG_ERR);
     65  1.1  cgd 	return (osa.sa_handler);
     66  1.1  cgd }
     67