getvfsbyname.c revision 84768 
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.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)kvm_getvfsbyname.c	8.1 (Berkeley) 4/3/95";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/lib/libc/gen/getvfsbyname.c 84768 2001-10-10 17:48:44Z bde $";
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/mount.h>
44#include <sys/sysctl.h>
45#include <errno.h>
46
47/*
48 * Given a filesystem name, determine if it is resident in the kernel,
49 * and if it is resident, return its vfsconf structure.
50 */
51getvfsbyname(fsname, vfcp)
52	const char *fsname;
53	struct vfsconf *vfcp;
54{
55#ifdef	__NETBSD_SYSCALLS
56	errno = ENOSYS;
57#else
58	int name[4], maxtypenum, cnt;
59	size_t buflen;
60
61	name[0] = CTL_VFS;
62	name[1] = VFS_GENERIC;
63	name[2] = VFS_MAXTYPENUM;
64	buflen = 4;
65	if (sysctl(name, 3, &maxtypenum, &buflen, (void *)0, (size_t)0) < 0)
66		return (-1);
67	name[2] = VFS_CONF;
68	buflen = sizeof *vfcp;
69	for (cnt = 0; cnt < maxtypenum; cnt++) {
70		name[3] = cnt;
71		if (sysctl(name, 4, vfcp, &buflen, (void *)0, (size_t)0) < 0) {
72			if (errno != EOPNOTSUPP)
73				return (-1);
74			continue;
75		}
76		if (!strcmp(fsname, vfcp->vfc_name))
77			return (0);
78	}
79	errno = ENOENT;
80#endif
81	return (-1);
82}
83