t_optint_option&nbsp;=&nbsp;<span class="constructor">SO_LINGER</span><br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;socket_float_option&nbsp;=&nbsp;<span class="constructor">SO_RCVTIMEO</span>&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">SO_SNDTIMEO</span><br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;getsockopt&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">UnixLabels</span>.file_descr&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="co