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      1 /*	$NetBSD: getmntinfo.c,v 1.17 2012/03/20 16:36:05 matt 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 1.17 2012/03/20 16:36:05 matt Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <sys/param.h>
     43 #include <sys/ucred.h>
     44 #include <sys/mount.h>
     45 
     46 #include <assert.h>
     47 #include <errno.h>
     48 #include <stdlib.h>
     49 
     50 /*
     51  * Return information about mounted filesystems.
     52  */
     53 int
     54 getmntinfo(struct statvfs **mntbufp, int flags)
     55 {
     56 	static struct statvfs *mntbuf;
     57 	static int mntsize;
     58 	static size_t bufsize;
     59 
     60 	_DIAGASSERT(mntbufp != NULL);
     61 
     62 	if (mntsize <= 0 &&
     63 	    (mntsize = getvfsstat(NULL, (size_t)0, MNT_NOWAIT)) == -1)
     64 		return (0);
     65 	if (bufsize > 0 &&
     66 	    (mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
     67 		return (0);
     68 	while (bufsize <= mntsize * sizeof(struct statvfs)) {
     69 		if (mntbuf)
     70 			free(mntbuf);
     71 		bufsize = (mntsize + 1) * sizeof(struct statvfs);
     72 		if ((mntbuf = malloc(bufsize)) == NULL)
     73 			return (0);
     74 		if ((mntsize = getvfsstat(mntbuf, bufsize, flags)) == -1)
     75 			return (0);
     76 	}
     77 	*mntbufp = mntbuf;
     78 	return (mntsize);
     79 }
     80