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getmntinfo.c revision 1.5.4.1 
      1 /*	$NetBSD: getmntinfo.c,v 1.5.4.1 1996/09/19 20:02:56 jtc 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)getmntinfo.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getmntinfo.c,v 1.5.4.1 1996/09/19 20:02:56 jtc Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 #include <sys/param.h>
     46 #include <sys/ucred.h>
     47 #include <sys/mount.h>
     48 #include <stdlib.h>
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(getmntinfo,_getmntinfo);
     52 #endif
     53 
     54 /*
     55  * Return information about mounted filesystems.
     56  */
     57 int
     58 getmntinfo(mntbufp, flags)
     59 	struct statfs **mntbufp;
     60 	int flags;
     61 {
     62 	static struct statfs *mntbuf;
     63 	static int mntsize;
     64 	static long bufsize;
     65 
     66 	if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0)
     67 		return (0);
     68 	if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
     69 		return (0);
     70 	while (bufsize <= mntsize * sizeof(struct statfs)) {
     71 		if (mntbuf)
     72 			free(mntbuf);
     73 		bufsize = (mntsize + 1) * sizeof(struct statfs);
     74 		if ((mntbuf = (struct statfs *)malloc(bufsize)) == 0)
     75 			return (0);
     76 		if ((mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
     77 			return (0);
     78 	}
     79 	*mntbufp = mntbuf;
     80 	return (mntsize);
     81 }
     82