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'. */ |
26 | libc_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 | |
32 | static void |
33 | allocate (void) |
34 | { |
35 | getmntent_buffer = (char *) malloc (BUFFER_SIZE); |
36 | } |
37 | |
38 | |
39 | struct mntent * |
40 | getmntent (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 | |