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getmntinfo.c revision 1.9 
      1 /*	$NetBSD: getmntinfo.c,v 1.9 1999/09/16 11:44:59 lukem 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 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)getmntinfo.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: getmntinfo.c,v 1.9 1999/09/16 11:44:59 lukem Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <sys/param.h>
     47 #include <sys/ucred.h>
     48 #include <sys/mount.h>
     49 
     50 #include <assert.h>
     51 #include <errno.h>
     52 #include <stdlib.h>
     53 
     54 #ifdef __weak_alias
     55 __weak_alias(getmntinfo,_getmntinfo);
     56 #endif
     57 
     58 /*
     59  * Return information about mounted filesystems.
     60  */
     61 int
     62 getmntinfo(mntbufp, flags)
     63 	struct statfs **mntbufp;
     64 	int flags;
     65 {
     66 	static struct statfs *mntbuf;
     67 	static int mntsize;
     68 	static size_t bufsize;
     69 
     70 	_DIAGASSERT(mntbufp != NULL);
     71 #ifdef _DIAGNOSTIC
     72 	if (mntbufp == NULL) {
     73 		errno = EFAULT;
     74 		return (0);
     75 	}
     76 #endif
     77 
     78 	if (mntsize <= 0 &&
     79 	    (mntsize = getfsstat(NULL, 0L, MNT_NOWAIT)) < 0)
     80 		return (0);
     81 	if (bufsize > 0 &&
     82 	    (mntsize = getfsstat(mntbuf, (long)bufsize, flags)) < 0)
     83 		return (0);
     84 	while (bufsize <= mntsize * sizeof(struct statfs)) {
     85 		if (mntbuf)
     86 			free(mntbuf);
     87 		bufsize = (mntsize + 1) * sizeof(struct statfs);
     88 		if ((mntbuf = (struct statfs *)malloc(bufsize)) == 0)
     89 			return (0);
     90 		if ((mntsize = getfsstat(mntbuf, (long)bufsize, flags)) < 0)
     91 			return (0);
     92 	}
     93 	*mntbufp = mntbuf;
     94 	return (mntsize);
     95 }
     96