&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;dir_handle&nbsp;=&nbsp;<span class="constructor">Unix</span>.dir_handle<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;opendir&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">UnixLabels</span>.dir_handle<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;readdir&nbsp;:&nbsp;<span class="constructor">UnixLabels</span>.dir_handle&nbsp