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getmntinfo.c revision 1.1 
      1  1.1  cgd /*
      2  1.1  cgd  * Copyright (c) 1989 The Regents of the University of California.
      3  1.1  cgd  * All rights reserved.
      4  1.1  cgd  *
      5  1.1  cgd  * Redistribution and use in source and binary forms, with or without
      6  1.1  cgd  * modification, are permitted provided that the following conditions
      7  1.1  cgd  * are met:
      8  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
      9  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     10  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     11  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     12  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     13  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     14  1.1  cgd  *    must display the following acknowledgement:
     15  1.1  cgd  *	This product includes software developed by the University of
     16  1.1  cgd  *	California, Berkeley and its contributors.
     17  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     18  1.1  cgd  *    may be used to endorse or promote products derived from this software
     19  1.1  cgd  *    without specific prior written permission.
     20  1.1  cgd  *
     21  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  1.1  cgd  * SUCH DAMAGE.
     32  1.1  cgd  */
     33  1.1  cgd 
     34  1.1  cgd #if defined(LIBC_SCCS) && !defined(lint)
     35  1.1  cgd static char sccsid[] = "@(#)getmntinfo.c	6.4 (Berkeley) 2/23/91";
     36  1.1  cgd #endif /* LIBC_SCCS and not lint */
     37  1.1  cgd 
     38  1.1  cgd #include <sys/types.h>
     39  1.1  cgd #include <sys/mount.h>
     40  1.1  cgd #include <stdlib.h>
     41  1.1  cgd 
     42  1.1  cgd /*
     43  1.1  cgd  * Return information about mounted filesystems.
     44  1.1  cgd  */
     45  1.1  cgd int
     46  1.1  cgd getmntinfo(mntbufp, flags)
     47  1.1  cgd 	struct statfs **mntbufp;
     48  1.1  cgd 	int flags;
     49  1.1  cgd {
     50  1.1  cgd 	static struct statfs *mntbuf;
     51  1.1  cgd 	static int mntsize;
     52  1.1  cgd 	static long bufsize;
     53  1.1  cgd 
     54  1.1  cgd 	if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0)
     55  1.1  cgd 		return (0);
     56  1.1  cgd 	if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
     57  1.1  cgd 		return (0);
     58  1.1  cgd 	while (bufsize <= mntsize * sizeof(struct statfs)) {
     59  1.1  cgd 		if (mntbuf)
     60  1.1  cgd 			free(mntbuf);
     61  1.1  cgd 		bufsize = (mntsize + 1) * sizeof(struct statfs);
     62  1.1  cgd 		if ((mntbuf = (struct statfs *)malloc(bufsize)) == 0)
     63  1.1  cgd 			return (0);
     64  1.1  cgd 		if ((mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
     65  1.1  cgd 			return (0);
     66  1.1  cgd 	}
     67  1.1  cgd 	*mntbufp = mntbuf;
     68  1.1  cgd 	return (mntsize);
     69  1.1  cgd }
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