l&nbsp;:&nbsp;<span class="constructor">Pervasives</span>.out_channel&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">UnixLabels</span>.file_descr<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;seek_command&nbsp;=&nbsp;<span class="constructor">Unix</span>.seek_command&nbsp;=&nbsp;<span class="constructor">SEEK_SET</span>&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">SEEK_CUR</span>&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="construc