1/*	$NetBSD: getmntinfo.c,v 1.15 2005/04/12 21:36:46 drochner 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 1.15 2005/04/12 21:36:46 drochner Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#define __LIBC12_SOURCE__
42
43#include "namespace.h"
44#include <sys/param.h>
45#include <sys/ucred.h>
46#include <sys/mount.h>
47#include <compat/sys/mount.h>
48
49#include <assert.h>
50#include <errno.h>
51#include <stdlib.h>
52
53#ifdef __weak_alias
54__weak_alias(getmntinfo,_getmntinfo)
55#endif
56
57/*
58 * Return information about mounted filesystems.
59 */
60int
61getmntinfo(mntbufp, flags)
62	struct statfs12 **mntbufp;
63	int flags;
64{
65	static struct statfs12 *mntbuf;
66	static int mntsize;
67	static size_t bufsize;
68
69	_DIAGASSERT(mntbufp != NULL);
70
71	if (mntsize <= 0 &&
72	    (mntsize = getfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
73		return (0);
74	if (bufsize > 0 &&
75	    (mntsize = getfsstat(mntbuf, (long)bufsize, flags)) == -1)
76		return (0);
77	while (bufsize <= mntsize * sizeof(struct statfs12)) {
78		if (mntbuf)
79			free(mntbuf);
80		bufsize = (mntsize + 1) * sizeof(struct statfs12);
81		if ((mntbuf = malloc(bufsize)) == NULL)
82			return (0);
83		if ((mntsize = getfsstat(mntbuf, (long)bufsize, flags)) == -1)
84			return (0);
85	}
86	*mntbufp = mntbuf;
87	return (mntsize);
88}
89