OpenSolaris_b135/lib/libc/port/sys/label.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"

#include "lint.h"
#include <sys/types.h>
#include <sys/syscall.h>
#include <sys/tsol/tsyscall.h>
#include <unistd.h>
#include <limits.h>
#include <stdlib.h>
#include <errno.h>
#include "libc.h"

static	int	_is_labeled = -1;

/*
 * is_system_labeled :
 *	Return the status of MAC labeling on this system.
 *	Returns 0 if labeling is not installed or not active,
 */
int
is_system_labeled(void)
{
	if (_is_labeled >= 0)
		return (_is_labeled);		/* fast path if cached */

	return (_is_labeled = syscall(SYS_labelsys, TSOL_SYSLABELING));
}