Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / getvfsbyname.c
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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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)kvm_getvfsbyname.c 8.1 (Berkeley) 4/3/95
34 * $FreeBSD: src/lib/libc/gen/getvfsbyname.c,v 1.5 1999/08/27 23:58:45 peter Exp $
eb318baa 35 * $DragonFly: src/lib/libc/gen/getvfsbyname.c,v 1.4 2005/04/26 06:08:42 joerg Exp $
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36 */
37
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38#include <sys/param.h>
39#include <sys/mount.h>
40#include <sys/sysctl.h>
41#include <errno.h>
a146e48c 42#include <string.h>
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43
44/*
45 * Given a filesystem name, determine if it is resident in the kernel,
46 * and if it is resident, return its vfsconf structure.
47 */
a146e48c
JS
48int
49getvfsbyname(const char *fsname, struct vfsconf *vfcp)
984263bc 50{
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51 int name[4], maxtypenum, cnt;
52 size_t buflen;
53
54 name[0] = CTL_VFS;
55 name[1] = VFS_GENERIC;
56 name[2] = VFS_MAXTYPENUM;
57 buflen = 4;
58 if (sysctl(name, 3, &maxtypenum, &buflen, (void *)0, (size_t)0) < 0)
59 return (-1);
60 name[2] = VFS_CONF;
61 buflen = sizeof *vfcp;
62 for (cnt = 0; cnt < maxtypenum; cnt++) {
63 name[3] = cnt;
64 if (sysctl(name, 4, vfcp, &buflen, (void *)0, (size_t)0) < 0) {
65 if (errno != EOPNOTSUPP)
66 return (-1);
67 continue;
68 }
69 if (!strcmp(fsname, vfcp->vfc_name))
70 return (0);
71 }
72 errno = ENOENT;
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73 return (-1);
74}