OpenSolaris_b135/lib/libc/port/sys/bsd_signal.c

/*
 * 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.
 */

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

#pragma weak _bsd_signal = bsd_signal

#include "lint.h"
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <wait.h>

/*
 * Check for valid signal number
 */
#define	CHECK_SIG(s, code) \
	if ((s) <= 0 || (s) >= NSIG || (s) == SIGKILL || (s) == SIGSTOP) { \
		errno = EINVAL; \
		return (code); \
	}

void (*
bsd_signal(int sig, void(*func)(int)))(int)
{
	struct sigaction nact;
	struct sigaction oact;

	CHECK_SIG(sig, SIG_ERR);

	nact.sa_handler = func;
	nact.sa_flags = SA_RESTART;
	(void) sigemptyset(&nact.sa_mask);
	(void) sigaddset(&nact.sa_mask, sig);

	if (sigaction(sig, &nact, &oact) == -1)
		return (SIG_ERR);

	return (oact.sa_handler);
}