lib/libc/compat/gen/compat_getmntinfo.c

   1 /*      $NetBSD: getmntinfo.c,v 1.15 2005/04/12 21:36:46 drochner 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: getmntinfo.c,v 1.15 2005/04/12 21:36:46 drochner 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 #ifdef __weak_alias
  54 __weak_alias(getmntinfo,_getmntinfo)
  55 #endif
  56
  57 /*
  58  * Return information about mounted filesystems.
  59  */
  60 int
  61 getmntinfo(mntbufp, flags)
  62         struct statfs12 **mntbufp;
  63         int flags;
  64 {
  65         static struct statfs12 *mntbuf;
  66         static int mntsize;
  67         static size_t bufsize;
  68
  69         _DIAGASSERT(mntbufp != NULL);
  70
  71         if (mntsize <= 0 &&
  72             (mntsize = getfsstat(NULL, 0L, MNT_NOWAIT)) == -1)
  73                 return (0);
  74         if (bufsize > 0 &&
  75             (mntsize = getfsstat(mntbuf, (long)bufsize, flags)) == -1)
  76                 return (0);
  77         while (bufsize <= mntsize * sizeof(struct statfs12)) {
  78                 if (mntbuf)
  79                         free(mntbuf);
  80                 bufsize = (mntsize + 1) * sizeof(struct statfs12);
  81                 if ((mntbuf = malloc(bufsize)) == NULL)
  82                         return (0);
  83                 if ((mntsize = getfsstat(mntbuf, (long)bufsize, flags)) == -1)
  84                         return (0);
  85         }
  86         *mntbufp = mntbuf;
  87         return (mntsize);
  88 }