1 /*
2 * Copyright (c) 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)kvm_getvfsbyname.c 8.1 (Berkeley) 4/3/95
30 * $FreeBSD: src/lib/libc/gen/getvfsbyname.c,v 1.5 1999/08/27 23:58:45 peter Exp $
31 * $DragonFly: src/lib/libc/gen/getvfsbyname.c,v 1.4 2005/04/26 06:08:42 joerg Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/mount.h>
36 #include <sys/sysctl.h>
37 #include <errno.h>
38 #include <string.h>
39
40 /*
41 * Given a filesystem name, determine if it is resident in the kernel,
42 * and if it is resident, return its vfsconf structure.
43 */
44 int
getvfsbyname(const char * fsname,struct vfsconf * vfcp)45 getvfsbyname(const char *fsname, struct vfsconf *vfcp)
46 {
47 int name[4], maxtypenum, cnt;
48 size_t buflen;
49
50 name[0] = CTL_VFS;
51 name[1] = VFS_GENERIC;
52 name[2] = VFS_MAXTYPENUM;
53 buflen = sizeof(maxtypenum);
54 if (sysctl(name, 3, &maxtypenum, &buflen, NULL, (size_t)0) < 0)
55 return (-1);
56
57 name[2] = VFS_CONF;
58 buflen = sizeof(*vfcp);
59 for (cnt = 0; cnt < maxtypenum; cnt++) {
60 name[3] = cnt;
61 if (sysctl(name, 4, vfcp, &buflen, NULL, (size_t)0) < 0) {
62 if (errno == EOPNOTSUPP)
63 continue;
64 return (-1);
65 }
66 if (strcmp(fsname, vfcp->vfc_name) == 0)
67 return (0);
68 }
69 errno = ENOENT;
70 return (-1);
71 }
72