summary refs log tree commit diff
path: root/misc/mntent.c
blob: 41267d72c0cd7889e45f61572a92366a36abb550 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
/* Utilities for reading/writing fstab, mtab, etc.
   Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <mntent.h>
#include <stdlib.h>
#include <bits/libc-lock.h>

/* We don't want to allocate the static buffer all the time since it
   is not always used (in fact, rather infrequently).  Accept the
   extra cost of a `malloc'.  */
static char *getmntent_buffer;

/* This is the size of the buffer.  This is really big.  */
#define BUFFER_SIZE	4096


static void
allocate (void)
{
  getmntent_buffer = (char *) malloc (BUFFER_SIZE);
}


struct mntent *
getmntent (FILE *stream)
{
  static struct mntent m;
  __libc_once_define (static, once);
  __libc_once (once, allocate);

  if (getmntent_buffer == NULL)
    /* If no core is available we don't have a chance to run the
       program successfully and so returning NULL is an acceptable
       result.  */
    return NULL;

  return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);
}


/* Make sure the memory is freed if the programs ends while in
   memory-debugging mode and something actually was allocated.  */
static void
__attribute__ ((unused))
free_mem (void)
{
  free (getmntent_buffer);
}

text_set_element (__libc_subfreeres, free_mem);