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<p>Requeue the first unacked segment for retransmission</p>
<p>Called by tcp_receive() for fast retransmit.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">pcb</td><td>the <a class="el" href="structtcp__pcb.html">tcp_pcb</a> for which to retransmit the first unacked segment </td></tr>
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