xref: /illumos-gate/usr/src/cmd/mail/setsig.c (revision 4de2612967d06c4fdbf524a62556a1e8118a006f)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23 /*	  All Rights Reserved  	*/
24 
25 
26 #pragma ident	"%Z%%M%	%I%	%E% SMI" 	/* SVr4.0 2.	*/
27 #include "mail.h"
28 /*
29 	Signal reset
30 	signals that are not being ignored will be
31 	caught by function f
32 		i	-> signal number
33 		f	-> signal routine
34 	return
35 		rc	-> former signal
36  */
37 void (*setsig(i, f))()
38 int      i;
39 void      (*f)();
40 {
41 	register void (*rc)();
42 
43 	if ((rc = signal(i, SIG_IGN)) != (void (*)()) SIG_IGN)
44 		signal(i, f);
45 	return(rc);
46 }
47