usr/src/lib/libc/port/sys/label.c

   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 }