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7a770247 | 1 | /* Utilities for reading/writing fstab, mtab, etc. |
688903eb | 2 | Copyright (C) 1995-2018 Free Software Foundation, Inc. |
19361cb7 | 3 | This file is part of the GNU C Library. |
7a770247 | 4 | |
19361cb7 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
7a770247 | 9 | |
19361cb7 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
7a770247 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
7a770247 RM |
18 | |
19 | #include <mntent.h> | |
1cab5444 | 20 | #include <stdlib.h> |
ec999b8e | 21 | #include <libc-lock.h> |
1cab5444 UD |
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'. */ | |
c877418f | 26 | libc_freeres_ptr (static char *getmntent_buffer); |
1cab5444 UD |
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 | ||
7a770247 | 38 | |
7a770247 RM |
39 | struct mntent * |
40 | getmntent (FILE *stream) | |
41 | { | |
7a770247 | 42 | static struct mntent m; |
1cab5444 UD |
43 | __libc_once_define (static, once); |
44 | __libc_once (once, allocate); | |
7a770247 | 45 | |
1cab5444 UD |
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 | } |