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<div class="title">tcp.h</div> </div>
</div><!--header-->
<div class="contents">
<a href="tcp_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>  </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * Copyright (c) 2001-2004 Swedish Institute of Computer Science.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * 3. The name of the author may not be used to endorse or promote products</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#ifndef LWIP_HDR_TCP_H</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#define LWIP_HDR_TCP_H</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#include "<a class="code" href="opt_8h.html">net/opt.h</a>"</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#if LWIP_TCP </span><span class="comment">/* don't build if not configured for use in lwipopts.h */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#include "<a class="code" href="mem_8h.html">net/mem.h</a>"</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#include "<a class="code" href="pbuf_8h.html">net/pbuf.h</a>"</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include "<a class="code" href="ip_8h.html">net/ip.h</a>"</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include "<a class="code" href="icmp_8h.html">net/icmp.h</a>"</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#include "<a class="code" href="err_8h.html">net/err.h</a>"</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#include "<a class="code" href="ip6_8h.html">net/ip6.h</a>"</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#include "<a class="code" href="ip6__addr_8h.html">net/ip6_addr.h</a>"</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">struct </span>tcp_pcb;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">typedef</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> (*tcp_accept_fn)(<span class="keywordtype">void</span> *arg, <span class="keyword">struct </span>tcp_pcb *newpcb, <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">typedef</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> (*tcp_recv_fn)(<span class="keywordtype">void</span> *arg, <span class="keyword">struct </span>tcp_pcb *tpcb,</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">struct </span><a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err);</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="keyword">typedef</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> (*tcp_sent_fn)(<span class="keywordtype">void</span> *arg, <span class="keyword">struct </span>tcp_pcb *tpcb,</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> len);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="keyword">typedef</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> (*tcp_poll_fn)(<span class="keywordtype">void</span> *arg, <span class="keyword">struct </span>tcp_pcb *tpcb);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="keyword">typedef</span> void (*tcp_err_fn)(<span class="keywordtype">void</span> *arg, <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err);</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="keyword">typedef</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> (*tcp_connected_fn)(<span class="keywordtype">void</span> *arg, <span class="keyword">struct </span>tcp_pcb *tpcb, <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  </div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="preprocessor">#define RCV_WND_SCALE(pcb, wnd) (((wnd) >> (pcb)->rcv_scale))</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="preprocessor">#define SND_WND_SCALE(pcb, wnd) (((wnd) << (pcb)->snd_scale))</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="preprocessor">#define TCPWND16(x) ((u16_t)LWIP_MIN((x), 0xFFFF))</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="preprocessor">#define TCP_WND_MAX(pcb) ((tcpwnd_size_t)(((pcb)->flags & TF_WND_SCALE) ? TCP_WND : TCPWND16(TCP_WND)))</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="keyword">typedef</span> <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> tcpwnd_size_t;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="preprocessor">#define RCV_WND_SCALE(pcb, wnd) (wnd)</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="preprocessor">#define SND_WND_SCALE(pcb, wnd) (wnd)</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="preprocessor">#define TCPWND16(x) (x)</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="preprocessor">#define TCP_WND_MAX(pcb) TCP_WND</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="keyword">typedef</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> tcpwnd_size_t;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="preprocessor">#if LWIP_WND_SCALE || TCP_LISTEN_BACKLOG || LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="keyword">typedef</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> tcpflags_t;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="keyword">typedef</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> tcpflags_t;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="keyword">enum</span> tcp_state {</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  CLOSED = 0,</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  LISTEN = 1,</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  SYN_SENT = 2,</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  SYN_RCVD = 3,</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  ESTABLISHED = 4,</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  FIN_WAIT_1 = 5,</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  FIN_WAIT_2 = 6,</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  CLOSE_WAIT = 7,</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  CLOSING = 8,</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  LAST_ACK = 9,</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  TIME_WAIT = 10</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> };</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  </div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="preprocessor">#define TCP_PCB_COMMON(type) \</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="preprocessor"> type *next; </span><span class="comment">/* for the linked list */</span><span class="preprocessor"> \</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="preprocessor"> void *callback_arg; \</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="preprocessor"> enum tcp_state state; </span><span class="comment">/* TCP state */</span><span class="preprocessor"> \</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="preprocessor"> u8_t prio; \</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="preprocessor"> </span><span class="comment">/* ports are in host byte order */</span><span class="preprocessor"> \</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="preprocessor"> u16_t local_port</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  </div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="keyword">struct </span>tcp_pcb_listen {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <a class="code" href="ip_8h.html#a8bdf4b5f674375e76cdd968826d80e53">IP_PCB</a>;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  TCP_PCB_COMMON(<span class="keyword">struct</span> tcp_pcb_listen);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  </div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="preprocessor">#if LWIP_CALLBACK_API</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">/* Function to call when a listener has been connected. */</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  tcp_accept_fn accept;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_CALLBACK_API */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  </div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="preprocessor">#if TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> backlog;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> accepts_pending;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> };</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  </div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  </div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="keyword">struct </span>tcp_pcb {</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <a class="code" href="ip_8h.html#a8bdf4b5f674375e76cdd968826d80e53">IP_PCB</a>;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  TCP_PCB_COMMON(<span class="keyword">struct</span> tcp_pcb);</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="comment">/* ports are in host byte order */</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> remote_port;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  </div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  tcpflags_t flags;</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="preprocessor">#define TF_ACK_DELAY 0x01U </span><span class="comment">/* Delayed ACK. */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="preprocessor">#define TF_ACK_NOW 0x02U </span><span class="comment">/* Immediate ACK. */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="preprocessor">#define TF_INFR 0x04U </span><span class="comment">/* In fast recovery. */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="preprocessor">#define TF_CLOSEPEND 0x08U </span><span class="comment">/* If this is set, tcp_close failed to enqueue the FIN (retried in tcp_tmr) */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="preprocessor">#define TF_RXCLOSED 0x10U </span><span class="comment">/* rx closed by tcp_shutdown */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="preprocessor">#define TF_FIN 0x20U </span><span class="comment">/* Connection was closed locally (FIN segment enqueued). */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="preprocessor">#define TF_NODELAY 0x40U </span><span class="comment">/* Disable Nagle algorithm */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="preprocessor">#define TF_NAGLEMEMERR 0x80U </span><span class="comment">/* nagle enabled, memerr, try to output to prevent delayed ACK to happen */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="preprocessor">#define TF_WND_SCALE 0x0100U </span><span class="comment">/* Window Scale option enabled */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="preprocessor">#if TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="preprocessor">#define TF_BACKLOGPEND 0x0200U </span><span class="comment">/* If this is set, a connection pcb has increased the backlog on its listener */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="preprocessor">#define TF_TIMESTAMP 0x0400U </span><span class="comment">/* Timestamp option enabled */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  </div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="comment">/* the rest of the fields are in host byte order</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> as we have to do some math with them */</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">/* Timers */</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> polltmr, pollinterval;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> last_timer;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> tmr;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  </div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="comment">/* receiver variables */</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> rcv_nxt; <span class="comment">/* next seqno expected */</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  tcpwnd_size_t rcv_wnd; <span class="comment">/* receiver window available */</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  tcpwnd_size_t rcv_ann_wnd; <span class="comment">/* receiver window to announce */</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> rcv_ann_right_edge; <span class="comment">/* announced right edge of window */</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  </div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">/* Retransmission timer. */</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <a class="code" href="group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a> rtime;</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> mss; <span class="comment">/* maximum segment size */</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  </div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="comment">/* RTT (round trip time) estimation variables */</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> rttest; <span class="comment">/* RTT estimate in 500ms ticks */</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> rtseq; <span class="comment">/* sequence number being timed */</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <a class="code" href="group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a> sa, sv; <span class="comment">/* @todo document this */</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  </div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <a class="code" href="group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a> rto; <span class="comment">/* retransmission time-out */</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> nrtx; <span class="comment">/* number of retransmissions */</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  </div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="comment">/* fast retransmit/recovery */</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> dupacks;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> lastack; <span class="comment">/* Highest acknowledged seqno. */</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  </div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">/* congestion avoidance/control variables */</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  tcpwnd_size_t cwnd;</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  tcpwnd_size_t ssthresh;</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  </div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="comment">/* sender variables */</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> snd_nxt; <span class="comment">/* next new seqno to be sent */</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> snd_wl1, snd_wl2; <span class="comment">/* Sequence and acknowledgement numbers of last</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> window update. */</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> snd_lbb; <span class="comment">/* Sequence number of next byte to be buffered. */</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  tcpwnd_size_t snd_wnd; <span class="comment">/* sender window */</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  tcpwnd_size_t snd_wnd_max; <span class="comment">/* the maximum sender window announced by the remote host */</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  </div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  tcpwnd_size_t snd_buf; <span class="comment">/* Available buffer space for sending (in bytes). */</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="preprocessor">#define TCP_SNDQUEUELEN_OVERFLOW (0xffffU-3)</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> snd_queuelen; <span class="comment">/* Number of pbufs currently in the send buffer. */</span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  </div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="comment">/* Extra bytes available at the end of the last pbuf in unsent. */</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> unsent_oversize;</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  </div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="comment">/* These are ordered by sequence number: */</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keyword">struct </span>tcp_seg *unsent; <span class="comment">/* Unsent (queued) segments. */</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keyword">struct </span>tcp_seg *unacked; <span class="comment">/* Sent but unacknowledged segments. */</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ</span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keyword">struct </span>tcp_seg *ooseq; <span class="comment">/* Received out of sequence segments. */</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  </div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keyword">struct </span><a class="code" href="structpbuf.html">pbuf</a> *refused_data; <span class="comment">/* Data previously received but not yet taken by upper layer */</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  </div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="preprocessor">#if LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keyword">struct </span>tcp_pcb_listen* listener;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  </div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="preprocessor">#if LWIP_CALLBACK_API</span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="comment">/* Function to be called when more send buffer space is available. */</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  tcp_sent_fn sent;</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="comment">/* Function to be called when (in-sequence) data has arrived. */</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  tcp_recv_fn recv;</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="comment">/* Function to be called when a connection has been set up. */</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  tcp_connected_fn connected;</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="comment">/* Function which is called periodically. */</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  tcp_poll_fn poll;</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="comment">/* Function to be called whenever a fatal error occurs. */</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  tcp_err_fn errf;</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_CALLBACK_API */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  </div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> ts_lastacksent;</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> ts_recent;</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP_TIMESTAMPS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  </div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="comment">/* idle time before KEEPALIVE is sent */</span></div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> keep_idle;</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="preprocessor">#if LWIP_TCP_KEEPALIVE</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> keep_intvl;</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> keep_cnt;</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP_KEEPALIVE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  </div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <span class="comment">/* Persist timer counter */</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> persist_cnt;</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="comment">/* Persist timer back-off */</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> persist_backoff;</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  </div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <span class="comment">/* KEEPALIVE counter */</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> keep_cnt_sent;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> snd_scale;</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> rcv_scale;</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> };</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  </div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="preprocessor">#if LWIP_EVENT_API</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  </div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="keyword">enum</span> lwip_event {</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  LWIP_EVENT_ACCEPT,</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  LWIP_EVENT_SENT,</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  LWIP_EVENT_RECV,</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  LWIP_EVENT_CONNECTED,</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  LWIP_EVENT_POLL,</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  LWIP_EVENT_ERR</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> };</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  </div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> lwip_tcp_event(<span class="keywordtype">void</span> *arg, <span class="keyword">struct</span> tcp_pcb *pcb,</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keyword">enum</span> lwip_event,</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p,</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> size,</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err);</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  </div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_EVENT_API */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  </div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="comment">/* Application program's interface: */</span></div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> <span class="keyword">struct </span>tcp_pcb * tcp_new (<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="keyword">struct </span>tcp_pcb * tcp_new_ip_type (<a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> type);</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  </div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="keywordtype">void</span> tcp_arg (<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keywordtype">void</span> *arg);</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> <span class="preprocessor">#if LWIP_CALLBACK_API</span></div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="keywordtype">void</span> tcp_recv (<span class="keyword">struct</span> tcp_pcb *pcb, tcp_recv_fn recv);</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> <span class="keywordtype">void</span> tcp_sent (<span class="keyword">struct</span> tcp_pcb *pcb, tcp_sent_fn sent);</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> <span class="keywordtype">void</span> tcp_err (<span class="keyword">struct</span> tcp_pcb *pcb, tcp_err_fn err);</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> <span class="keywordtype">void</span> tcp_accept (<span class="keyword">struct</span> tcp_pcb *pcb, tcp_accept_fn accept);</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_CALLBACK_API */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="keywordtype">void</span> tcp_poll (<span class="keyword">struct</span> tcp_pcb *pcb, tcp_poll_fn poll, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> interval);</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  </div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span> <span class="preprocessor">#define tcp_mss(pcb) (((pcb)->flags & TF_TIMESTAMP) ? ((pcb)->mss - 12) : (pcb)->mss)</span></div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="preprocessor">#else </span><span class="comment">/* LWIP_TCP_TIMESTAMPS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> <span class="preprocessor">#define tcp_mss(pcb) ((pcb)->mss)</span></div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP_TIMESTAMPS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span> <span class="preprocessor">#define tcp_sndbuf(pcb) (TCPWND16((pcb)->snd_buf))</span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> <span class="preprocessor">#define tcp_sndqueuelen(pcb) ((pcb)->snd_queuelen)</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  </div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> <span class="preprocessor">#define tcp_nagle_disable(pcb) ((pcb)->flags |= TF_NODELAY)</span></div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  </div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="preprocessor">#define tcp_nagle_enable(pcb) ((pcb)->flags = (tcpflags_t)((pcb)->flags & ~TF_NODELAY))</span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  </div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="preprocessor">#define tcp_nagle_disabled(pcb) (((pcb)->flags & TF_NODELAY) != 0)</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  </div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="preprocessor">#if TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> <span class="preprocessor">#define tcp_backlog_set(pcb, new_backlog) do { \</span></div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="preprocessor"> LWIP_ASSERT("pcb->state == LISTEN (called for wrong pcb?)", (pcb)->state == LISTEN); \</span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> <span class="preprocessor"> ((struct tcp_pcb_listen *)(pcb))->backlog = ((new_backlog) ? (new_backlog) : 1); } while(0)</span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="keywordtype">void</span> tcp_backlog_delayed(<span class="keyword">struct</span> tcp_pcb* pcb);</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> <span class="keywordtype">void</span> tcp_backlog_accepted(<span class="keyword">struct</span> tcp_pcb* pcb);</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor">#else </span><span class="comment">/* TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> <span class="preprocessor">#define tcp_backlog_set(pcb, new_backlog)</span></div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="preprocessor">#define tcp_backlog_delayed(pcb)</span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="preprocessor">#define tcp_backlog_accepted(pcb)</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="preprocessor">#define tcp_accepted(pcb) </span><span class="comment">/* compatibility define, not needed any more */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  </div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="keywordtype">void</span> tcp_recved (<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> len);</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_bind (<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *ipaddr,</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> port);</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_connect (<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *ipaddr,</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> port, tcp_connected_fn connected);</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  </div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span> <span class="keyword">struct </span>tcp_pcb * tcp_listen_with_backlog_and_err(<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> backlog, <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> *err);</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span> <span class="keyword">struct </span>tcp_pcb * tcp_listen_with_backlog(<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> backlog);</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span> <span class="preprocessor">#define tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)</span></div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  </div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span> <span class="keywordtype">void</span> tcp_abort (<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_close (<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_shutdown(<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keywordtype">int</span> shut_rx, <span class="keywordtype">int</span> shut_tx);</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  </div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span> <span class="comment">/* Flags for "apiflags" parameter in tcp_write */</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span> <span class="preprocessor">#define TCP_WRITE_FLAG_COPY 0x01</span></div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> <span class="preprocessor">#define TCP_WRITE_FLAG_MORE 0x02</span></div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  </div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_write (<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">const</span> <span class="keywordtype">void</span> *dataptr, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> len,</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> apiflags);</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  </div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="keywordtype">void</span> tcp_setprio (<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> prio);</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  </div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="preprocessor">#define TCP_PRIO_MIN 1</span></div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> <span class="preprocessor">#define TCP_PRIO_NORMAL 64</span></div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> <span class="preprocessor">#define TCP_PRIO_MAX 127</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  </div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <a class="code" href="group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_output (<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  </div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  </div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* tcp_debug_state_str(<span class="keyword">enum</span> tcp_state s);</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  </div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="comment">/* for compatibility with older implementation */</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="preprocessor">#define tcp_new_ip6() tcp_new_ip_type(IPADDR_TYPE_V6)</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  </div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> }</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  </div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  </div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_HDR_TCP_H */</span><span class="preprocessor"></span></div>
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