xref: /netbsd-src/lib/libc/compat/gen/compat___getmntinfo13.c (revision 02cdd248ec8b17634bab40aa4f2e161a756d7fce)
1 /*	$NetBSD: compat___getmntinfo13.c,v 1.1 2019/09/22 22:59:38 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Christos Zoulas.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: compat___getmntinfo13.c,v 1.1 2019/09/22 22:59:38 christos Exp $");
35 #endif /* LIBC_SCCS and not lint */
36 
37 #define __LIBC12_SOURCE__
38 
39 #include "namespace.h"
40 
41 #include <sys/types.h>
42 #include <sys/param.h>
43 
44 #include <assert.h>
45 #include <compat/sys/statvfs.h>
46 #include <string.h>
47 #include <stdlib.h>
48 
49 __warn_references(__getmntinfo13,
50     "warning: reference to obsolete __getmntinfo13(); use statvfs()")
51 
__strong_alias(__getmntinfo13,__compat___getmntinfo13)52 __strong_alias(__getmntinfo13, __compat___getmntinfo13)
53 
54 /*
55  * Return information about mounted filesystems.
56  */
57 int
58 __compat___getmntinfo13(struct statvfs90 **mntbufp, int flags)
59 {
60 	static struct statvfs90 *mntbuf;
61 	static int mntsize;
62 	static size_t bufsize;
63 
64 	_DIAGASSERT(mntbufp != NULL);
65 
66 	if (mntsize <= 0 &&
67 	    (mntsize = __compat_getvfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
68 		return (0);
69 	if (bufsize > 0 &&
70 	    (mntsize = __compat_getvfsstat(mntbuf, bufsize, flags)) == -1)
71 		return (0);
72 	while (bufsize <= mntsize * sizeof(struct statvfs90)) {
73 		if (mntbuf)
74 			free(mntbuf);
75 		bufsize = (mntsize + 1) * sizeof(struct statvfs90);
76 		if ((mntbuf = malloc(bufsize)) == NULL)
77 			return (0);
78 		if ((mntsize = __compat_getvfsstat(mntbuf, bufsize,
79 		    flags)) == -1)
80 			return (0);
81 	}
82 	*mntbufp = mntbuf;
83 	return (mntsize);
84 }
85