getvfsbyname.c revision 76178 
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 76178 2001-05-01 09:30:02Z markm $";
40#endif /* not lint */
41
42#include <sys/param.h>
43#include <sys/lock.h>
44#include <sys/mutex.h>
45#include <sys/mount.h>
46#include <sys/sysctl.h>
47#include <errno.h>
48
49/*
50 * Given a filesystem name, determine if it is resident in the kernel,
51 * and if it is resident, return its vfsconf structure.
52 */
53getvfsbyname(fsname, vfcp)
54	const char *fsname;
55	struct vfsconf *vfcp;
56{
57#ifdef	__NETBSD_SYSCALLS
58	errno = ENOSYS;
59#else
60	int name[4], maxtypenum, cnt;
61	size_t buflen;
62
63	name[0] = CTL_VFS;
64	name[1] = VFS_GENERIC;
65	name[2] = VFS_MAXTYPENUM;
66	buflen = 4;
67	if (sysctl(name, 3, &maxtypenum, &buflen, (void *)0, (size_t)0) < 0)
68		return (-1);
69	name[2] = VFS_CONF;
70	buflen = sizeof *vfcp;
71	for (cnt = 0; cnt < maxtypenum; cnt++) {
72		name[3] = cnt;
73		if (sysctl(name, 4, vfcp, &buflen, (void *)0, (size_t)0) < 0) {
74			if (errno != EOPNOTSUPP)
75				return (-1);
76			continue;
77		}
78		if (!strcmp(fsname, vfcp->vfc_name))
79			return (0);
80	}
81	errno = ENOENT;
82#endif
83	return (-1);
84}
85