lib/libc/compat/gen/compat_getmntinfo.c

   1 /*      $NetBSD: compat_getmntinfo.c,v 1.4 2013/10/04 21:07:37 christos 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)getmntinfo.c        8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: compat_getmntinfo.c,v 1.4 2013/10/04 21:07:37 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #define __LIBC12_SOURCE__
  42
  43 #include "namespace.h"
  44 #include <sys/param.h>
  45 #include <sys/ucred.h>
  46 #include <sys/mount.h>
  47 #include <compat/sys/mount.h>
  48
  49 #include <assert.h>
  50 #include <errno.h>
  51 #include <stdlib.h>
  52
  53 __strong_alias(getmntinfo, __compat_getmntinfo)
  54
  55 /*
  56  * Return information about mounted filesystems.
  57  */
  58 int
  59 __compat_getmntinfo(struct statfs12 **mntbufp, int flags)
  60 {
  61         static struct statfs12 *mntbuf;
  62         static int mntsize;
  63         static size_t bufsize;
  64
  65         _DIAGASSERT(mntbufp != NULL);
  66
  67         if (mntsize <= 0 &&
  68             (mntsize = __compat_getfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
  69                 return (0);
  70         if (bufsize > 0 &&
  71             (mntsize = __compat_getfsstat(mntbuf, (long)bufsize, flags)) == -1)
  72                 return (0);
  73         while (bufsize <= mntsize * sizeof(struct statfs12)) {
  74                 if (mntbuf)
  75                         free(mntbuf);
  76                 bufsize = (mntsize + 1) * sizeof(struct statfs12);
  77                 if ((mntbuf = malloc(bufsize)) == NULL)
  78                         return (0);
  79                 if ((mntsize = __compat_getfsstat(mntbuf, (long)bufsize,
  80                     flags)) == -1)
  81                         return (0);
  82         }
  83         *mntbufp = mntbuf;
  84         return (mntsize);
  85 }