tcp__server__demo_8c-source.html

Freescale mcu OpenTCP-1.0.4.doc.html.zip 文档

00163 {
00164 <span class="comment">/* This function is called by TCP stack to inform about events  */</span>
00165         UINT16 i;
00166         
00167         <span class="keywordflow">if</span>( cbhandle != <a class="code" href="tcp__server__demo_8c.html#a1">tcps_demo_soch</a>)         <span class="comment">/* Not our handle       */</span>
00168                 <span class="keywordflow">return</span>(-1);
00169         
00170         <span class="keywordflow">switch</span>( event ){
00171                 
00172                 <span class="comment">/* Connection request event. Used by TCP/IP stack to inform</span>
00173 <span class="comment">                 * the application someone is trying to establish a connection.</span>
00174 <span class="comment">                 * Server can decide, based on provided IP address and port number,</span>
00175 <span class="comment">                 * whether to allow or not connection establishment.</span>
00176 <span class="comment">                 * Parameters:</span>
00177 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00178 <span class="comment">                 *  - par2 - remote hosts port number</span>
00179 <span class="comment">                 * </span>
00180 <span class="comment">                 * Return values from event listener:</span>
00181 <span class="comment">                 * -1 - do not allow connection to be established (send reset)</span>
00182 <span class="comment">                 * -2 - do not send any response for now to the SYN packet (let's</span>
00183 <span class="comment">                 *              think a little before answering)</span>
00184 <span class="comment">                 * 1  - allow connection to be established</span>
00185 <span class="comment">                 */</span>
00186                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a54">TCP_EVENT_CONREQ</a>:
00187                         DEBUGOUT(<span class="stringliteral">"Connection request arrived!\r\n"</span>);
00188                         
00189                         <span class="comment">/* Enable all connections       */</span>
00190                         <span class="keywordflow">return</span>(1);
00191                 
00192                         <span class="keywordflow">break</span>;
00193                         
00194                 <span class="comment">/* Connection abort event. Connection on a given socket is beeing </span>
00195 <span class="comment">                 * aborted for somereason (usually retransmissions are used up or </span>
00196 <span class="comment">                 * some abnormal situation in communication happened).</span>
00197 <span class="comment">                 * Parameters:</span>
00198 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00199 <span class="comment">                 *  - par2 - remote hosts port number</span>
00200 <span class="comment">                 */</span>
00201                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a57">TCP_EVENT_ABORT</a>:
00202                         DEBUGOUT(<span class="stringliteral">"Connection aborting!\r\n"</span>);
00203                         <span class="keywordflow">break</span>;
00204                 
00205                 <span class="comment">/* Connection established event - three-way handshaking performed</span>
00206 <span class="comment">                 * OK and connection is established.</span>
00207 <span class="comment">                 * Parameters:</span>
00208 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00209 <span class="comment">                 *  - par2 - remote hosts port number</span>
00210 <span class="comment">                 */</span>
00211                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a55">TCP_EVENT_CONNECTED</a>:
00212                         DEBUGOUT(<span class="stringliteral">"TCP connection established!\r\n"</span>);
00213                 
00214                         <span class="keywordflow">break</span>;
00215                         
00216                 <span class="comment">/* Connection closing event. Happens when TCP connection is</span>
00217 <span class="comment">                 * intentionally close by some side calling close function and</span>
00218 <span class="comment">                 * initializing proper TCP connection close procedure.</span>
00219 <span class="comment">                 * Parameters:</span>
00220 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00221 <span class="comment">                 *  - par2 - remote hosts port number</span>
00222 <span class="comment">                 */</span>
00223                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a56">TCP_EVENT_CLOSE</a>:
00224                         DEBUGOUT(<span class="stringliteral">"TCP Connection closing...!\r\n"</span>);
00225                         <span class="keywordflow">break</span>;
00226                         
00227                 <span class="comment">/* Data acknowledgment event. Happens when data that was</span>
00228 <span class="comment">                 * previously sent gets acknowledged. This means we can now</span>
00229 <span class="comment">                 * send some more data! :-)</span>
00230 <span class="comment">                 * Parameters:</span>
00231 <span class="comment">                 *  - par1 - remote hosts IP address</span>
00232 <span class="comment">                 *  - par2 - remote hosts port number</span>
00233 <span class="comment">                 */</span>
00234                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a58">TCP_EVENT_ACK</a>:
00235                         DEBUGOUT(<span class="stringliteral">"Data acknowledged!\r\n"</span>);
00236                         <span class="comment">/* if more data should be sent, adjust variables and</span>
00237 <span class="comment">                                set tcps_demo_senddata variable */</span>
00238                                 
00239                         <span class="keywordflow">break</span>;
00240                 
00241                 <span class="comment">/* Data received event. Happens when we receive some data over the</span>
00242 <span class="comment">                 * TCP connection.</span>
00243 <span class="comment">                 * Parameters:</span>
00244 <span class="comment">                 *  - par1 - number of data bytes received</span>
00245 <span class="comment">                 *  - par2 = 0</span>
00246 <span class="comment">                 */</span>
00247                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a60">TCP_EVENT_DATA</a>:
00248                         DEBUGOUT(<span class="stringliteral">"Data arrived!\r\n"</span>);
00249                         <span class="comment">/* read data that was received (and </span>
00250 <span class="comment">                         * probably do something with it :-)</span>
00251 <span class="comment">                         */</span>
00252                         <span class="keywordflow">for</span>(i=0;i&lt;par1;i++)
00253                                 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();
00254                                 
00255                         <span class="comment">/* If needed initialize data sending</span>
00256 <span class="comment">                         * by setting tcps_demo_senddata variable</span>
00257 <span class="comment">                         */</span>
00258                         <span class="keywordflow">break</span>;
00259                         
00260                 <span class="comment">/* Regenerate data event. Happens when data needs to be</span>
00261 <span class="comment">                 * retransmitted because of possible loss on the network.</span>
00262 <span class="comment">                 * Note that THE SAME DATA must be sent over and over again</span>
00263 <span class="comment">                 * until TCP_EVENT_ACK is generated (for that data)! </span>
00264 <span class="comment">                 * Parameters:</span>
00265 <span class="comment">                 *  - par1 - amount of data to regenerate (usually all)</span>
00266 <span class="comment">                 *      - par2 = 0</span>
00267 <span class="comment">                 */</span>
00268                 <span class="keywordflow">case</span> <a class="code" href="tcp__ip_8h.html#a59">TCP_EVENT_REGENERATE</a>:
00269                         tcps_demo_send();
00270                         <span class="keywordflow">break</span>;
00271         
00272         
00273                 <span class="keywordflow">default</span>:
00274                         <span class="keywordflow">return</span>(-1);
00275         }
00276 }
00277 
00278 INT16 tcps_demo_send(<span class="keywordtype">void</span>){
00279         UINT16 i;
00280         <span class="comment">/* first check if data sending is possible (it may be that</span>
00281 <span class="comment">         * previously sent data is not yet acknowledged)</span>
00282 <span class="comment">         */</span>
00283         <span class="keywordflow">if</span>(<a class="code" href="tcp_8c.html#a10">tcp_checksend</a>(<a class="code" href="tcp__server__demo_8c.html#a1">tcps_demo_soch</a>) &lt; 0 ){
00284                 <span class="comment">/* Not yet */</span>
00285                 <span class="keywordflow">return</span> -1;
00286         }
00287         
00288         <span class="comment">/* put message in buffer. Message needs to start from TCP_APP_OFFSET</span>
00289 <span class="comment">         * because TCP/IP stack will put headers in front of the message to</span>
00290 <span class="comment">         * avoid data copying</span>
00291 <span class="comment">         */</span>
00292         <span class="keywordflow">for</span>(i=0;i&lt;32;i++)
00293                 net_buf[<a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>+i]=<span class="charliteral">'A'</span>+(i%25);
00294 
00295         <span class="comment">/* send data */</span>
00296         <span class="keywordflow">return</span> <a class="code" href="tcp_8c.html#a7">tcp_send</a>(<a class="code" href="tcp__server__demo_8c.html#a1">tcps_demo_soch</a>, &amp;net_buf[<a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>], <a class="code" href="group__opentcp__config.html#a4">NETWORK_TX_BUFFER_SIZE</a> - <a class="code" href="tcp__ip_8h.html#a61">TCP_APP_OFFSET</a>, 32);
00297 
00298 }
</pre></div><hr><address style="align: right;"><small>Generated on Sun Aug 3 20:32:59 2003 for OpenTCP by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border=0 
width=110 height=53></a>1.2.18 </small></address>
</body>
</html>