="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;buf:bytes&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;pos:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;len:int&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;mode:<span class="constructor">UnixLabels</span>.msg_flag&nbsp;list&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;int<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;send_substring&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">UnixLabels</span>.file_descr&nbs