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getmntinfo.c revision 1.4 
      1 /*
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 /*static char *sccsid = "from: @(#)getmntinfo.c	6.4 (Berkeley) 2/23/91";*/
     36 static char *rcsid = "$Id: getmntinfo.c,v 1.4 1994/06/12 22:52:03 cgd Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/param.h>
     40 #include <sys/mount.h>
     41 #include <stdlib.h>
     42 
     43 /*
     44  * Return information about mounted filesystems.
     45  */
     46 int
     47 getmntinfo(mntbufp, flags)
     48 	struct statfs **mntbufp;
     49 	int flags;
     50 {
     51 	static struct statfs *mntbuf;
     52 	static int mntsize;
     53 	static long bufsize;
     54 
     55 	if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0)
     56 		return (0);
     57 	if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
     58 		return (0);
     59 	while (bufsize <= mntsize * sizeof(struct statfs)) {
     60 		if (mntbuf)
     61 			free(mntbuf);
     62 		bufsize = (mntsize + 1) * sizeof(struct statfs);
     63 		if ((mntbuf = (struct statfs *)malloc(bufsize)) == 0)
     64 			return (0);
     65 		if ((mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
     66 			return (0);
     67 	}
     68 	*mntbufp = mntbuf;
     69 	return (mntsize);
     70 }
     71