gen/FreeBSD/getmntinfo64.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)getmntinfo.c        8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/gen/getmntinfo.c,v 1.5 2007/01/09 00:27:54 imp Exp $");
  35
  36 #include <sys/param.h>
  37 #include <sys/ucred.h>
  38 #include <sys/mount.h>
  39 #include <stdlib.h>
  40
  41 /*
  42  * Return information about mounted filesystems.
  43  */
  44 int
  45 getmntinfo64(mntbufp, flags)
  46         struct statfs64 **mntbufp;
  47         int flags;
  48 {
  49         static struct statfs64 *mntbuf;
  50         static int mntsize;
  51         static long bufsize;
  52
  53         if (mntsize <= 0 && (mntsize = getfsstat64(0, 0, MNT_NOWAIT)) < 0)
  54                 return (0);
  55         if (bufsize > 0 && (mntsize = getfsstat64(mntbuf, bufsize, flags)) < 0)
  56                 return (0);
  57         while (bufsize <= mntsize * sizeof(struct statfs64)) {
  58                 if (mntbuf)
  59                         free(mntbuf);
  60                 bufsize = (mntsize + 1) * sizeof(struct statfs64);
  61                 if ((mntbuf = (struct statfs64 *)malloc(bufsize)) == 0)
  62                         return (0);
  63                 if ((mntsize = getfsstat64(mntbuf, bufsize, flags)) < 0)
  64                         return (0);
  65         }
  66         *mntbufp = mntbuf;
  67         return (mntsize);
  68 }