ntl<span class="op">(</span>fd<span class="op">,</span> F_SETLK<span class="op">,</span> <span class="op">&amp;</span>fl<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="cb25-41"><a href="flocking.html#cb25-41"></a>        perror<span class="op">(</span><span class="st">&quot;fcntl&quot;</span><span class="op">);</span></span>
<span id="cb25-42"><a href="flocking.html#cb25-42"></a>      