Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / getmntinfo.c
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1/*
2 * Copyright (c) 1989, 1993
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 * @(#)getmntinfo.c 8.1 (Berkeley) 6/4/93
0f52d283 34 * $DragonFly: src/lib/libc/gen/getmntinfo.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
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35 */
36
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37#include <sys/param.h>
38#include <sys/ucred.h>
39#include <sys/mount.h>
40#include <stdlib.h>
41
42/*
43 * Return information about mounted filesystems.
44 */
45int
0f52d283 46getmntinfo(struct statfs **mntbufp, int flags)
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47{
48 static struct statfs *mntbuf;
49 static int mntsize;
1e63b793 50 static int bufsize;
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51
52 if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0)
53 return (0);
54 if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
55 return (0);
1e63b793 56 while (bufsize <= mntsize * (int)sizeof(struct statfs)) {
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57 if (mntbuf)
58 free(mntbuf);
59 bufsize = (mntsize + 1) * sizeof(struct statfs);
60 if ((mntbuf = (struct statfs *)malloc(bufsize)) == 0)
61 return (0);
62 if ((mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
63 return (0);
64 }
65 *mntbufp = mntbuf;
66 return (mntsize);
67}