2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software donated to Berkeley by
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9 * modification, are permitted provided that the following conditions
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17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
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21 * may be used to endorse or promote products derived from this software
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36 * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
37 * @(#)mount_null.c 8.6 (Berkeley) 4/26/95
38 * $FreeBSD: src/sbin/mount_null/mount_null.c,v 1.13 1999/10/09 11:54:11 phk Exp $
39 * $DragonFly: src/sbin/mount_null/mount_null.c,v 1.4 2003/09/28 14:39:19 hmp Exp $
42 #include <sys/param.h>
43 #include <sys/mount.h>
44 #include <vfs/nullfs/null.h>
55 struct mntopt mopts[] = {
60 int subdir __P((const char *, const char *));
61 static void usage __P((void)) __dead2;
64 main(int argc, char **argv)
66 struct null_args args;
68 char source[MAXPATHLEN];
69 char target[MAXPATHLEN];
74 while ((ch = getopt(argc, argv, "o:")) != -1)
77 getmntopts(optarg, mopts, &mntflags, 0);
89 /* resolve target and source with realpath(3) */
90 (void)checkpath(argv[0], target);
91 (void)checkpath(argv[1], source);
93 if (subdir(target, source) || subdir(source, target))
94 errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
95 argv[0], target, argv[1]);
99 error = getvfsbyname("null", &vfc);
100 if (error && vfsisloadable("null")) {
102 err(EX_OSERR, "vfsload(null)");
104 error = getvfsbyname("null", &vfc);
107 errx(EX_OSERR, "null/loopback filesystem is not available");
109 if (mount(vfc.vfc_name, source, mntflags, &args))
115 subdir(const char *p, const char *dir)
123 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
132 (void)fprintf(stderr,
133 "usage: mount_null [-o options] target_fs mount_point\n");