c&quot;</span><span class="op">,</span> O_RDWR<span class="op">))</span> <span class="op">==</span> <span class="op">-</span><span class="dv">1</span><span class="op">)</span> <span class="op">{</span></span>
<span id="cb25-21"><a href="flocking.html#cb25-21"></a>        perror<span class="op">(</span><span class="st">&quot;open&quot;</span><span class="op">);</span></span>
<span id="cb25-22"><a href="flocking.html#cb25-22"></a>        exit<span class="op">(</span><span class="dv">1</span><span class="op">)