1 | /* Utilities for reading/writing fstab, mtab, etc. |
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2 | Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
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4 | |
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5 | The GNU C Library is free software; you can redistribute it and/or |
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6 | modify it under the terms of the GNU Lesser General Public |
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7 | License as published by the Free Software Foundation; either |
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8 | version 2.1 of the License, or (at your option) any later version. |
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9 | |
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10 | The GNU C Library is distributed in the hope that it will be useful, |
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11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 | Lesser General Public License for more details. |
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14 | |
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15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, write to the Free |
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17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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18 | 02111-1307 USA. */ |
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19 | |
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20 | #include <features.h> |
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21 | #include <mntent.h> |
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22 | #include <stdlib.h> |
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23 | #include <libc-symbols.h> |
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24 | #define _LIBC 1 |
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25 | #define NOT_IN_libc 1 |
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26 | #include <bits/libc-lock.h> |
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27 | |
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28 | /* We don't want to allocate the static buffer all the time since it |
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29 | is not always used (in fact, rather infrequently). Accept the |
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30 | extra cost of a `malloc'. */ |
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31 | static char *getmntent_buffer; |
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32 | |
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33 | /* This is the size of the buffer. This is really big. */ |
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34 | #define BUFFER_SIZE 4096 |
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35 | |
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36 | |
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37 | static void |
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38 | allocate (void) |
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39 | { |
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40 | getmntent_buffer = (char *) malloc (BUFFER_SIZE); |
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41 | } |
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42 | |
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43 | |
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44 | struct mntent * |
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45 | getmntent (FILE *stream) |
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46 | { |
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47 | static struct mntent m; |
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48 | static int once; |
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49 | |
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50 | do { |
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51 | if (__pthread_once != NULL) |
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52 | __pthread_once (&once, allocate); |
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53 | else if (once == 0) { |
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54 | allocate (); |
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55 | once = !(0); |
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56 | } |
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57 | } while (0); |
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58 | |
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59 | |
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60 | if (getmntent_buffer == NULL) |
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61 | /* If no core is available we don't have a chance to run the |
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62 | program successfully and so returning NULL is an acceptable |
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63 | result. */ |
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64 | return NULL; |
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65 | |
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66 | return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE); |
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67 | } |
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68 | |
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69 | |
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70 | /* Make sure the memory is freed if the programs ends while in |
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71 | memory-debugging mode and something actually was allocated. */ |
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72 | static void |
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73 | __attribute__ ((unused)) |
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74 | free_mem (void) |
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75 | { |
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76 | free (getmntent_buffer); |
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77 | } |
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78 | |
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79 | text_set_element (__libc_subfreeres, free_mem); |
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