sbin/mount_kernfs/mount_kernfs.c

   1 /*      $NetBSD: mount_kernfs.c,v 1.22 2007/07/16 17:09:42 pooka Exp $  */
   2
   3 /*
   4  * Copyright (c) 1992, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Jan-Simon Pendry.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 1990, 1992 Jan-Simon Pendry
  37  *
  38  * This code is derived from software contributed to Berkeley by
  39  * Jan-Simon Pendry.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *      This product includes software developed by the University of
  52  *      California, Berkeley and its contributors.
  53  * 4. Neither the name of the University nor the names of its contributors
  54  *    may be used to endorse or promote products derived from this software
  55  *    without specific prior written permission.
  56  *
  57  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  58  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  59  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  60  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  61  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  62  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  63  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  64  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  65  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  66  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  67  * SUCH DAMAGE.
  68  */
  69
  70 #include <sys/cdefs.h>
  71 #ifndef lint
  72 __COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
  73  The Regents of the University of California.  All rights reserved.");
  74 #endif /* not lint */
  75
  76 #ifndef lint
  77 #if 0
  78 static char sccsid[] = "@(#)mount_kernfs.c      8.3 (Berkeley) 5/4/95";
  79 #else
  80 __RCSID("$NetBSD: mount_kernfs.c,v 1.22 2007/07/16 17:09:42 pooka Exp $");
  81 #endif
  82 #endif /* not lint */
  83
  84 #include <sys/param.h>
  85 #include <sys/mount.h>
  86
  87 #include <err.h>
  88 #include <unistd.h>
  89 #include <stdio.h>
  90 #include <stdlib.h>
  91 #include <string.h>
  92
  93 #include <mntopts.h>
  94
  95 static const struct mntopt mopts[] = {
  96         MOPT_STDOPTS,
  97         MOPT_GETARGS,
  98         MOPT_NULL,
  99 };
 100
 101 int     mount_kernfs(int argc, char **argv);
 102 static void     usage(void);
 103
 104 #ifndef MOUNT_NOMAIN
 105 int
 106 main(int argc, char **argv)
 107 {
 108         return mount_kernfs(argc, argv);
 109 }
 110 #endif
 111
 112 int
 113 mount_kernfs(int argc, char *argv[])
 114 {
 115         int ch, mntflags;
 116         char canon_dir[MAXPATHLEN];
 117         mntoptparse_t mp;
 118
 119         mntflags = 0;
 120         while ((ch = getopt(argc, argv, "o:")) != -1)
 121                 switch (ch) {
 122                 case 'o':
 123                         mp = getmntopts(optarg, mopts, &mntflags, 0);
 124                         if (mp == NULL)
 125                                 err(1, "getmntopts");
 126                         freemntopts(mp);
 127                         break;
 128                 case '?':
 129                 default:
 130                         usage();
 131                 }
 132         argc -= optind;
 133         argv += optind;
 134
 135         if (argc != 2)
 136                 usage();
 137
 138         /* not supported, fail silently */
 139         if (mntflags & MNT_GETARGS)
 140                 exit(0);
 141
 142         if (realpath(argv[1], canon_dir) == NULL)    /* Check mounton path */
 143                 err(1, "realpath %s", argv[1]);
 144         if (strncmp(argv[1], canon_dir, MAXPATHLEN)) {
 145                 warnx("\"%s\" is a relative path.", argv[1]);
 146                 warnx("using \"%s\" instead.", canon_dir);
 147         }
 148
 149         if (mount(MOUNT_KERNFS, canon_dir, mntflags, NULL, 0) == -1)
 150                 err(1, "kernfs on %s", argv[1]);
 151         exit(0);
 152 }
 153
 154 static void
 155 usage(void)
 156 {
 157         (void)fprintf(stderr,
 158                 "usage: mount_kernfs [-o options] /kern mount_point\n");
 159         exit(1);
 160 }