d&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">SIG_SETMASK</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">SIG_BLOCK</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywordsign">|</span>&nbsp;<span class="constructor">SIG_UNBLOCK</span><br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;sigprocmask&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;mode:<span class="constructor">UnixLabels</span>.sigprocmask_command&nbsp;<span class="keywor