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7a770247 | 1 | /* Utilities for reading/writing fstab, mtab, etc. |
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2 | Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. | |
7a770247 | 4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
7a770247 | 9 | |
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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 | Library General Public License for more details. | |
7a770247 | 14 | |
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15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
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19 | |
20 | #include <mntent.h> | |
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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 | 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 | ||
7a770247 | 39 | |
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40 | struct mntent * |
41 | getmntent (FILE *stream) | |
42 | { | |
7a770247 | 43 | static struct mntent m; |
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44 | __libc_once_define (static, once); |
45 | __libc_once (once, allocate); | |
7a770247 | 46 | |
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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 | } | |
55 | ||
56 | ||
57 | /* Make sure the memory is freed if the programs ends while in | |
58 | memory-debugging mode and something actually was allocated. */ | |
59 | static void | |
60 | __attribute__ ((unused)) | |
61 | free_mem (void) | |
62 | { | |
63 | if (getmntent_buffer != NULL) | |
64 | free (getmntent_buffer); | |
7a770247 | 65 | } |
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66 | |
67 | text_set_element (__libc_subfreeres, free_mem); |