1/* Utilities for reading/writing fstab, mtab, etc.
2 Copyright (C) 1995-2018 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, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <mntent.h>
20#include <stdlib.h>
21#include <libc-lock.h>
22
23/* We don't want to allocate the static buffer all the time since it
24 is not always used (in fact, rather infrequently). Accept the
25 extra cost of a `malloc'. */
26libc_freeres_ptr (static char *getmntent_buffer);
27
28/* This is the size of the buffer. This is really big. */
29#define BUFFER_SIZE 4096
30
31
32static void
33allocate (void)
34{
35 getmntent_buffer = (char *) malloc (BUFFER_SIZE);
36}
37
38
39struct mntent *
40getmntent (FILE *stream)
41{
42 static struct mntent m;
43 __libc_once_define (static, once);
44 __libc_once (once, allocate);
45
46 if (getmntent_buffer == NULL)
47 /* If no core is available we don't have a chance to run the
48 program successfully and so returning NULL is an acceptable
49 result. */
50 return NULL;
51
52 return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);
53}
54