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
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 static const char copyright[] =
35 "@(#) Copyright (c) 1992, 1993, 1994\n\
36 The Regents of the University of California. All rights reserved.\n";
41 static char sccsid[] = "@(#)mount_null.c 8.6 (Berkeley) 4/26/95";
43 static const char rcsid[] =
47 #include <sys/param.h>
48 #include <sys/mount.h>
60 int subdir(const char *, const char *);
61 static void usage(void) __dead2;
64 main(int argc, char *argv[])
68 char source[MAXPATHLEN];
69 char target[MAXPATHLEN];
72 char nullfs[] = "nullfs";
77 while ((ch = getopt(argc, argv, "o:")) != -1)
81 p = strchr(optarg, '=');
87 build_iovec(&iov, &iovlen, optarg, val, (size_t)-1);
99 /* resolve target and source with realpath(3) */
100 if (checkpath(argv[0], target) != 0)
101 err(EX_USAGE, "%s", target);
102 if (checkpath(argv[1], source) != 0)
103 err(EX_USAGE, "%s", source);
105 if (subdir(target, source) || subdir(source, target))
106 errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
107 argv[0], target, argv[1]);
109 build_iovec(&iov, &iovlen, "fstype", nullfs, (size_t)-1);
110 build_iovec(&iov, &iovlen, "fspath", source, (size_t)-1);
111 build_iovec(&iov, &iovlen, "target", target, (size_t)-1);
112 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
113 if (nmount(iov, iovlen, 0) < 0) {
115 err(1, "%s: %s", source, errmsg);
117 err(1, "%s", source);
123 subdir(const char *p, const char *dir)
131 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
140 (void)fprintf(stderr,
141 "usage: mount_nullfs [-o options] target mount-point\n");