/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 *	ssignal, gsignal: software signals

 */

#include "lint.h"

#include <sys/types.h>

#include <signal.h>

/* Highest allowable user signal number */

#define	MAXSIGNUM	17

/* Lowest allowable signal number (lowest user number is always 1) */

#define	MINSIG	(-4)

/* Table of signal values */

static int (*sigs[MAXSIGNUM-MINSIG+1])(int);

int (*

ssignal(int sig, int (*action)(int)))(int)

{

	int (*savefn)(int);

	if (sig >= MINSIG && sig <= MAXSIGNUM) {

		savefn = sigs[sig-MINSIG];

		sigs[sig-MINSIG] = action;

	} else

		savefn = (int(*)(int))SIG_DFL;

	return (savefn);

}

int

gsignal(int sig)

{

	int (*sigfn)(int);

	if (sig < MINSIG || sig > MAXSIGNUM ||

	    (sigfn = sigs[sig-MINSIG]) == (int(*)(int))SIG_DFL)

		return (0);

	else if (sigfn == (int(*)(int))SIG_IGN)

		return (1);

	else {

		sigs[sig-MINSIG] = (int(*)(int))SIG_DFL;

		return ((*sigfn)(sig));

	}

}