1/*	$NetBSD: getmntinfo.c,v 1.16 2005/09/13 01:44:09 christos Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)getmntinfo.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: getmntinfo.c,v 1.16 2005/09/13 01:44:09 christos Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <sys/param.h>
43#include <sys/ucred.h>
44#include <sys/mount.h>
45
46#include <assert.h>
47#include <errno.h>
48#include <stdlib.h>
49
50/*
51 * Return information about mounted filesystems.
52 */
53int
54getmntinfo(struct statvfs **mntbufp, int flags)
55{
56	static struct statvfs *mntbuf;
57	static int mntsize;
58	static size_t bufsize;
59
60	_DIAGASSERT(mntbufp != NULL);
61
62	if (mntsize <= 0 &&
63	    (mntsize = getvfsstat(NULL, (size_t)0, MNT_NOWAIT)) == -1)
64		return (0);
65	if (bufsize > 0 &&
66	    (mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
67		return (0);
68	while (bufsize <= mntsize * sizeof(struct statvfs)) {
69		if (mntbuf)
70			free(mntbuf);
71		bufsize = (mntsize + 1) * sizeof(struct statvfs);
72		if ((mntbuf = malloc(bufsize)) == NULL)
73			return (0);
74		if ((mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
75			return (0);
76	}
77	*mntbufp = mntbuf;
78	return (mntsize);
79}
80