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      1 /*	$NetBSD: getlabelsector.c,v 1.5 2011/09/04 12:34:49 jmcneill Exp $	*/
      2 
      3 /*
      4  * Copyright 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Steve C. Woodford for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed for the NetBSD Project by
     20  *      Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 __RCSID("$NetBSD: getlabelsector.c,v 1.5 2011/09/04 12:34:49 jmcneill Exp $");
     41 #endif
     42 
     43 #include <sys/param.h>
     44 #include <sys/sysctl.h>
     45 #include <util.h>
     46 
     47 int
     48 getlabelsector(void)
     49 {
     50 	int sector, mib[2];
     51 	size_t varlen;
     52 
     53 	mib[0] = CTL_KERN;
     54 	mib[1] = KERN_LABELSECTOR;
     55 	varlen = sizeof(sector);
     56 	if (sysctl(mib, 2, &sector, &varlen, NULL, (size_t)0) < 0)
     57 		return (-1);
     58 
     59 	return sector;
     60 }
     61 
     62 off_t
     63 getlabeloffset(void)
     64 {
     65 	int offset, mib[2];
     66 	size_t varlen;
     67 
     68 	mib[0] = CTL_KERN;
     69 	mib[1] = KERN_LABELOFFSET;
     70 	varlen = sizeof(offset);
     71 	if (sysctl(mib, 2, &offset, &varlen, NULL, (size_t)0) < 0)
     72 		return (-1);
     73 
     74 	return ((off_t)offset);
     75 }
     76 
     77 int
     78 getlabelusesmbr(void)
     79 {
     80 	int use;
     81 	size_t uselen;
     82 
     83 	uselen = sizeof(use);
     84 	if (sysctlbyname("kern.labelusesmbr", &use, &uselen,
     85 	    NULL, (size_t)0) < 0)
     86 		return (-1);
     87 
     88 	return use;
     89 }
     90