lib/libutil/getlabelsector.c

   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 }