 class="special">{</span>
      <span class="keyword">for</span> <span class="special">(;;)</span>
      <span class="special">{</span>
        <span class="comment">// Try the system call.</span>
        <span class="identifier">errno</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
        <span class="keyword">int</span> <span class="identifier">n</span> <span class="special">=</span> <span class="special">::</span><span class="identifier">sendfile</span><