sp;<span class="keywordsign">-&gt;</span>&nbsp;duration:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;tcdrain&nbsp;:&nbsp;<span class="constructor">UnixLabels</span>.file_descr&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;flush_queue&nbsp;=&nbsp;<span class="constructor">Unix</span>.flush_queue&nbsp;=&nbsp;<span class="constructor">TCIFLUSH</span>&nbsp;<span class="keywordsign">|