>val</span>&nbsp;map_file&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Unix</span>.file_descr&nbsp;<span class="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;?pos:int64&nbsp;<span class="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(<span class="keywordsign">'</span>a,&nbsp;<span class="keywordsign">'</span>b)&nbsp;<span class="constructor">Bigarray</span>.kind&nbsp;<span class="keywordsign">-&gt;</span>