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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">
&mdash; 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">
&mdash; 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">
&mdash; 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>. 
</p></blockquote></div>

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