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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 #include "lint.h"
     30 #include <sys/types.h>
     31 #include <sys/syscall.h>
     32 #include <sys/tsol/tsyscall.h>
     33 #include <unistd.h>
     34 #include <limits.h>
     35 #include <stdlib.h>
     36 #include <errno.h>
     37 #include "libc.h"
     38 
     39 static	int	_is_labeled = -1;
     40 
     41 /*
     42  * is_system_labeled :
     43  *	Return the status of MAC labeling on this system.
     44  *	Returns 0 if labeling is not installed or not active,
     45  */
     46 int
     47 is_system_labeled(void)
     48 {
     49 	if (_is_labeled >= 0)
     50 		return (_is_labeled);		/* fast path if cached */
     51 
     52 	return (_is_labeled = syscall(SYS_labelsys, TSOL_SYSLABELING));
     53 }
     54