usr/src/cmd/mail/setsig.c

   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 }