n>&nbsp;chmod&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;perm:<span class="constructor">UnixLabels</span>.file_perm&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;fchmod&nbsp;:&nbsp;<span class="constructor">UnixLabels</span>.file_descr&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;perm:<span class="constructor">UnixLabels</span>.file_perm&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class