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<p>Enqueue SYN or FIN for transmission.</p>
<p>Called by <a class="el" href="group__tcp__raw.html#ga9a31deea4cadacd39f9485f37cfdd012">tcp_connect</a>, tcp_listen_input, and <a class="el" href="group__tcp__raw.html#ga87093e137fcc53ea82a134a3f5b33623">tcp_close</a> (via <a class="el" href="tcp__priv_8h.html#af40ba9d645a8910436c3d7cf13dba342">tcp_send_fin</a>)</p>
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