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| <h4 class="subsection">14.2.5 Random Access in a Directory Stream</h4> |
| |
| <p><a name="index-dirent_002eh-1422"></a>This section describes how to reread parts of a directory that you have |
| already read from an open directory stream. All the symbols are |
| declared in the header file <samp><span class="file">dirent.h</span></samp>. |
| |
| <!-- dirent.h --> |
| <!-- POSIX.1 --> |
| <div class="defun"> |
| — Function: void <b>rewinddir</b> (<var>DIR *dirstream</var>)<var><a name="index-rewinddir-1423"></a></var><br> |
| <blockquote><p>The <code>rewinddir</code> function is used to reinitialize the directory |
| stream <var>dirstream</var>, so that if you call <code>readdir</code> it |
| returns information about the first entry in the directory again. This |
| function also notices if files have been added or removed to the |
| directory since it was opened with <code>opendir</code>. (Entries for these |
| files might or might not be returned by <code>readdir</code> if they were |
| added or removed since you last called <code>opendir</code> or |
| <code>rewinddir</code>.) |
| </p></blockquote></div> |
| |
| <!-- dirent.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: long <b>int</b><var> telldir </var>(<var>DIR *dirstream</var>)<var><a name="index-int-1424"></a></var><br> |
| <blockquote><p>The <code>telldir</code> function returns the file position of the directory |
| stream <var>dirstream</var>. You can use this value with <code>seekdir</code> to |
| restore the directory stream to that position. |
| </p></blockquote></div> |
| |
| <!-- dirent.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Function: void <b>seekdir</b> (<var>DIR *dirstream, long int pos</var>)<var><a name="index-seekdir-1425"></a></var><br> |
| <blockquote><p>The <code>seekdir</code> function sets the file position of the directory |
| stream <var>dirstream</var> to <var>pos</var>. The value <var>pos</var> must be the |
| result of a previous call to <code>telldir</code> on this particular stream; |
| closing and reopening the directory can invalidate values returned by |
| <code>telldir</code>. |
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