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      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 (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #pragma weak _bsd_signal = bsd_signal
     30 
     31 #include "lint.h"
     32 #include <sys/types.h>
     33 #include <errno.h>
     34 #include <signal.h>
     35 #include <wait.h>
     36 
     37 /*
     38  * Check for valid signal number
     39  */
     40 #define	CHECK_SIG(s, code) \
     41 	if ((s) <= 0 || (s) >= NSIG || (s) == SIGKILL || (s) == SIGSTOP) { \
     42 		errno = EINVAL; \
     43 		return (code); \
     44 	}
     45 
     46 void (*
     47 bsd_signal(int sig, void(*func)(int)))(int)
     48 {
     49 	struct sigaction nact;
     50 	struct sigaction oact;
     51 
     52 	CHECK_SIG(sig, SIG_ERR);
     53 
     54 	nact.sa_handler = func;
     55 	nact.sa_flags = SA_RESTART;
     56 	(void) sigemptyset(&nact.sa_mask);
     57 	(void) sigaddset(&nact.sa_mask, sig);
     58 
     59 	if (sigaction(sig, &nact, &oact) == -1)
     60 		return (SIG_ERR);
     61 
     62 	return (oact.sa_handler);
     63 }
     64