Annotation of src/lib/libc/gen/getmntinfo.c, Revision 1.17
1.17 ! matt 1: /* $NetBSD: getmntinfo.c,v 1.16 2005/09/13 01:44:09 christos Exp $ */
1.5 cgd 2:
1.1 cgd 3: /*
1.5 cgd 4: * Copyright (c) 1989, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 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.
1.12 agc 15: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 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:
1.6 christos 32: #include <sys/cdefs.h>
1.1 cgd 33: #if defined(LIBC_SCCS) && !defined(lint)
1.5 cgd 34: #if 0
35: static char sccsid[] = "@(#)getmntinfo.c 8.1 (Berkeley) 6/4/93";
36: #else
1.17 ! matt 37: __RCSID("$NetBSD: getmntinfo.c,v 1.16 2005/09/13 01:44:09 christos Exp $");
1.5 cgd 38: #endif
1.1 cgd 39: #endif /* LIBC_SCCS and not lint */
40:
1.7 jtc 41: #include "namespace.h"
1.4 cgd 42: #include <sys/param.h>
1.5 cgd 43: #include <sys/ucred.h>
1.1 cgd 44: #include <sys/mount.h>
1.9 lukem 45:
46: #include <assert.h>
47: #include <errno.h>
1.1 cgd 48: #include <stdlib.h>
1.7 jtc 49:
1.1 cgd 50: /*
51: * Return information about mounted filesystems.
52: */
53: int
1.17 ! matt 54: getmntinfo(struct statvfs **mntbufp, int flags)
1.1 cgd 55: {
1.16 christos 56: static struct statvfs *mntbuf;
1.1 cgd 57: static int mntsize;
1.8 perry 58: static size_t bufsize;
1.9 lukem 59:
60: _DIAGASSERT(mntbufp != NULL);
1.1 cgd 61:
1.8 perry 62: if (mntsize <= 0 &&
1.16 christos 63: (mntsize = getvfsstat(NULL, (size_t)0, MNT_NOWAIT)) == -1)
1.1 cgd 64: return (0);
1.8 perry 65: if (bufsize > 0 &&
1.16 christos 66: (mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
1.1 cgd 67: return (0);
1.16 christos 68: while (bufsize <= mntsize * sizeof(struct statvfs)) {
1.1 cgd 69: if (mntbuf)
70: free(mntbuf);
1.16 christos 71: bufsize = (mntsize + 1) * sizeof(struct statvfs);
1.13 christos 72: if ((mntbuf = malloc(bufsize)) == NULL)
1.1 cgd 73: return (0);
1.16 christos 74: if ((mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
1.1 cgd 75: return (0);
76: }
77: *mntbufp = mntbuf;
78: return (mntsize);
79: }
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