1 /* $OpenBSD: getmntinfo.c,v 1.11 2019/06/28 13:32:41 deraadt Exp $ */
2 /*
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/types.h>
32 #include <sys/mount.h>
33 #include <stdlib.h>
34
35 /*
36 * Return information about mounted filesystems.
37 */
38 int
getmntinfo(struct statfs ** mntbufp,int flags)39 getmntinfo(struct statfs **mntbufp, int flags)
40 {
41 static struct statfs *mntbuf;
42 static int mntsize;
43 static size_t bufsize;
44
45 if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) == -1)
46 return (0);
47 if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) == -1)
48 return (0);
49 while (bufsize <= mntsize * sizeof(struct statfs)) {
50 free(mntbuf);
51 bufsize = (mntsize + 1) * sizeof(struct statfs);
52 if ((mntbuf = malloc(bufsize)) == NULL) {
53 bufsize = 0;
54 return (0);
55 }
56 if ((mntsize = getfsstat(mntbuf, bufsize, flags)) == -1)
57 return (0);
58 }
59 *mntbufp = mntbuf;
60 return (mntsize);
61 }
62