1: /* Utilities for reading/writing fstab, mtab, etc.
    2:    Copyright (C) 1995, 1996, 1997, 2000, 2002 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <mntent.h>
   21: #include <stdlib.h>
   22: #include <bits/libc-lock.h>
   23: 
   24: /* We don't want to allocate the static buffer all the time since it
   25:    is not always used (in fact, rather infrequently).  Accept the
   26:    extra cost of a `malloc'.  */
   27: libc_freeres_ptr (static char *getmntent_buffer);
   28: 
   29: /* This is the size of the buffer.  This is really big.  */
   30: #define BUFFER_SIZE     4096
   31: 
   32: 
   33: static void
   34: allocate (void)
   35: {
   36:   getmntent_buffer = (char *) malloc (BUFFER_SIZE);
   37: }
   38: 
   39: 
   40: struct mntent *
   41: getmntent (FILE *stream)
   42: {
   43:   static struct mntent m;
   44:   __libc_once_define (static, once);
   45:   __libc_once (once, allocate);
   46: 
   47:   if (getmntent_buffer == NULL)
   48:     /* If no core is available we don't have a chance to run the
   49:        program successfully and so returning NULL is an acceptable
   50:        result.  */
   51:     return NULL;
   52: 
   53:   return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);
   54: }