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      1 /*	$NetBSD: compat_getmntinfo.c,v 1.4 2013/10/04 21:07:37 christos 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: compat_getmntinfo.c,v 1.4 2013/10/04 21:07:37 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #define __LIBC12_SOURCE__
     42 
     43 #include "namespace.h"
     44 #include <sys/param.h>
     45 #include <sys/ucred.h>
     46 #include <sys/mount.h>
     47 #include <compat/sys/mount.h>
     48 
     49 #include <assert.h>
     50 #include <errno.h>
     51 #include <stdlib.h>
     52 
     53 __strong_alias(getmntinfo, __compat_getmntinfo)
     54 
     55 /*
     56  * Return information about mounted filesystems.
     57  */
     58 int
     59 __compat_getmntinfo(struct statfs12 **mntbufp, int flags)
     60 {
     61 	static struct statfs12 *mntbuf;
     62 	static int mntsize;
     63 	static size_t bufsize;
     64 
     65 	_DIAGASSERT(mntbufp != NULL);
     66 
     67 	if (mntsize <= 0 &&
     68 	    (mntsize = __compat_getfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
     69 		return (0);
     70 	if (bufsize > 0 &&
     71 	    (mntsize = __compat_getfsstat(mntbuf, (long)bufsize, flags)) == -1)
     72 		return (0);
     73 	while (bufsize <= mntsize * sizeof(struct statfs12)) {
     74 		if (mntbuf)
     75 			free(mntbuf);
     76 		bufsize = (mntsize + 1) * sizeof(struct statfs12);
     77 		if ((mntbuf = malloc(bufsize)) == NULL)
     78 			return (0);
     79 		if ((mntsize = __compat_getfsstat(mntbuf, (long)bufsize,
     80 		    flags)) == -1)
     81 			return (0);
     82 	}
     83 	*mntbufp = mntbuf;
     84 	return (mntsize);
     85 }
     86