1 /* $NetBSD: getmntinfo.c,v 1.2 2020/06/17 00:16:21 kamil 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
35 static char sccsid[] = "@(#)getmntinfo.c 8.1 (Berkeley) 6/4/93";
36 #else
37 __RCSID("$NetBSD: getmntinfo.c,v 1.2 2020/06/17 00:16:21 kamil Exp $");
38 #endif
39 #endif /* LIBC_SCCS and not lint */
40
41 #include <sys/param.h>
42 #include <sys/ucred.h>
43 #include <sys/mount.h>
44
45 #include <rump/rump.h>
46 #include <rump/rump_syscallshotgun.h>
47 #include <rump/rump_syscalls.h>
48
49 #include <assert.h>
50 #include <errno.h>
51 #include <stdlib.h>
52
53 #define getvfsstat(a,b,c) rump_sys_getvfsstat(a,b,c)
54
55 /*
56 * Return information about mounted filesystems.
57 */
58 int
getmntinfo(mntbufp,flags)59 getmntinfo(mntbufp, flags)
60 struct statvfs **mntbufp;
61 int flags;
62 {
63 static struct statvfs *mntbuf;
64 static int mntsize;
65 static size_t bufsize;
66
67 _DIAGASSERT(mntbufp != NULL);
68
69 if (mntsize <= 0 &&
70 (mntsize = getvfsstat(NULL, (size_t)0, MNT_NOWAIT)) == -1)
71 return (0);
72 if (bufsize > 0 &&
73 (mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
74 return (0);
75 while (bufsize <= mntsize * sizeof(struct statvfs)) {
76 if (mntbuf)
77 free(mntbuf);
78 bufsize = (mntsize + 1) * sizeof(struct statvfs);
79 if ((mntbuf = malloc(bufsize)) == NULL)
80 return (0);
81 if ((mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
82 return (0);
83 }
84 *mntbufp = mntbuf;
85 return (mntsize);
86 }
87