NetBSD/lib/libc/gen/getmntinfo.c

82 lines
2.8 KiB
C

/* $NetBSD: getmntinfo.c,v 1.16 2005/09/13 01:44:09 christos Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getmntinfo.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getmntinfo.c,v 1.16 2005/09/13 01:44:09 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
/*
* Return information about mounted filesystems.
*/
int
getmntinfo(mntbufp, flags)
struct statvfs **mntbufp;
int flags;
{
static struct statvfs *mntbuf;
static int mntsize;
static size_t bufsize;
_DIAGASSERT(mntbufp != NULL);
if (mntsize <= 0 &&
(mntsize = getvfsstat(NULL, (size_t)0, MNT_NOWAIT)) == -1)
return (0);
if (bufsize > 0 &&
(mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
return (0);
while (bufsize <= mntsize * sizeof(struct statvfs)) {
if (mntbuf)
free(mntbuf);
bufsize = (mntsize + 1) * sizeof(struct statvfs);
if ((mntbuf = malloc(bufsize)) == NULL)
return (0);
if ((mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
return (0);
}
*mntbufp = mntbuf;
return (mntsize);
}