lib/libc/gen/getmntinfo.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  * 3. 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  * @(#)getmntinfo.c     8.1 (Berkeley) 6/4/93
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/ucred.h>
  34 #include <sys/mount.h>
  35 #include <stdlib.h>
  36
  37 /*
  38  * Return information about mounted filesystems.
  39  */
  40 int
  41 getmntinfo(struct statfs **mntbufp, int flags)
  42 {
  43         static struct statfs *mntbuf;
  44         static int mntsize;
  45         static int bufsize;
  46
  47         if (mntsize <= 0 && (mntsize = getfsstat(0, 0, MNT_NOWAIT)) < 0)
  48                 return (0);
  49         if (bufsize > 0 && (mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
  50                 return (0);
  51         while (bufsize <= mntsize * (int)sizeof(struct statfs)) {
  52                 if (mntbuf)
  53                         free(mntbuf);
  54                 bufsize = (mntsize + 1) * sizeof(struct statfs);
  55                 if ((mntbuf = (struct statfs *)malloc(bufsize)) == NULL)
  56                         return (0);
  57                 if ((mntsize = getfsstat(mntbuf, bufsize, flags)) < 0)
  58                         return (0);
  59         }
  60         *mntbufp = mntbuf;
  61         return (mntsize);
  62 }