?? tcp.lst
字號(hào):
205
206 TCP_DEBUGOUT("No socket found\r\n");
207 return(-1);
208
209 }
210
211 /** \brief Release a TCP socket
212 * \ingroup tcp_app_api
213 * \author
214 * \li Jari Lahti (jari.lahti@violasystems.com)
215 * \date 21.07.2002
216 * \param sochandle handle to socket to be released
217 * \return
218 * \li -1 - Error releasing the socket (Wrong socket handle or socket
219 * not in proper state to be released)
220 * \li >=0 - handle of the released socket (can not be used any more
221 * untill allocated again with tcp_getsocket()).
222 *
223 * Once the application does not need the TCP socket any more it can invoke
224 * this function in order to release it. This is usefull if there is a very
225 * limited number of sockets (in order to save some memory) shared among
226 * several applications.
227 */
228 INT8 tcp_releasesocket (INT8 sochandle)
C51 COMPILER V7.06 TCP 11/26/2004 11:32:45 PAGE 5
229 {
230 struct tcb* soc;
231
232 if( NO_OF_TCPSOCKETS < 0 )
233 return(-1);
234
235 if( NO_OF_TCPSOCKETS == 0 )
236 return(-1);
237
238 if( sochandle > NO_OF_TCPSOCKETS ) {
239 TCP_DEBUGOUT("Socket handle non-valid\r\n");
240 return(-1);
241 }
242
243 if( sochandle < 0 ) {
244 TCP_DEBUGOUT("Socket handle non-valid\r\n");
245 return(-1);
246 }
247
248 soc = &tcp_socket[sochandle]; /* Get referense */
249
250 if( (soc->state != TCP_STATE_FREE) &&
251 (soc->state != TCP_STATE_RESERVED) &&
252 (soc->state != TCP_STATE_CLOSED) ) {
253 TCP_DEBUGOUT("Socket is not on valid state to be released\r\n");
254 return(-1);
255 }
256
257 /* We are there so all OK */
258
259 soc->state = TCP_STATE_FREE;
260 soc->type = TCP_TYPE_NONE;
261 soc->tos = 0;
262 soc->event_listener = 0;
263 soc->rem_ip = 0;
264 soc->remport = 0;
265 soc->locport = 0;
266 soc->flags = 0;
267
268 return(sochandle);
269
270 }
271
272 /** \brief Put TCP socket to listen on a given port
273 * \ingroup tcp_app_api
274 * \author
275 * \li Jari Lahti (jari.lahti@violasystems.com)
276 * \date 21.07.2002
277 * \param sochandle handle to socket to be placed to listen state
278 * \param port TCP port number on which it should listen
279 * \return
280 * \li -1 - Error
281 * \li >=0 - OK (Socket put to listening state. Handle to
282 * socket returned)
283 *
284 * This function will attempt to put socket to listening state. This
285 * is only possible if socket was defined as either #TCP_TYPE_SERVER or
286 * #TCP_TYPE_CLIENT_SERVER. If basic correctness checks pass, socket is
287 * put to listening mode and corresponding tcb entry is initialized.
288 *
289 */
290 INT8 tcp_listen (INT8 sochandle, UINT16 port)
C51 COMPILER V7.06 TCP 11/26/2004 11:32:45 PAGE 6
291 {
292 struct tcb* soc;
293
294 if( NO_OF_TCPSOCKETS < 0 )
295 return(-1);
296
297 if( NO_OF_TCPSOCKETS == 0 )
298 return(-1);
299
300 if( sochandle > NO_OF_TCPSOCKETS ) {
301 TCP_DEBUGOUT("Socket handle non-valid\r\n");
302 return(-1);
303 }
304
305 if( sochandle < 0 ) {
306 TCP_DEBUGOUT("Socket handle non-valid\r\n");
307 return(-1);
308 }
309
310 soc = &tcp_socket[sochandle]; /* Get referense */
311
312 if( (soc->type & TCP_TYPE_SERVER) == 0 ) {
313 TCP_DEBUGOUT("Socket has no server properties\r\n");
314 return(-1);
315 }
316
317 if( soc->event_listener == 0) {
318 TCP_DEBUGOUT("ERROR:No event listener function specified\r\n");
319 return(-1);
320 }
321
322
323 if( (soc->state != TCP_STATE_RESERVED) &&
324 (soc->state != TCP_STATE_LISTENING) &&
325 (soc->state != TCP_STATE_CLOSED) &&
326 (soc->state != TCP_STATE_TIMED_WAIT) ) {
327 TCP_DEBUGOUT("Not possible to listen, socket on connected state\r\n");
328 return(-1);
329
330 }
331
332
333 /* Init socket */
334
335 soc->state = TCP_STATE_LISTENING;
336 /*soc->type = TCP_TYPE_SERVER;*/
337 soc->flags = 0;
338 soc->rem_ip = 0;
339 soc->remport = 0;
340 soc->locport = port;
341 soc->send_unacked = 0;
342 soc->myflags = 0;
343 soc->send_next = 0xFFFFFFFF;
344 soc->send_mtu = TCP_DEF_MTU;
345 soc->receive_next = 0;
346 soc->retries_left = 0;
347
348 TCP_DEBUGOUT("TCP listening socket created\r\n");
349
350 return(sochandle);
351
352 }
C51 COMPILER V7.06 TCP 11/26/2004 11:32:45 PAGE 7
353
354
355 /** \brief Initialize connection establishment towards remote IP&port
356 * \ingroup tcp_app_api
357 * \author
358 * \li Jari Lahti (jari.lahti@violasystems.com)
359 * \date 21.07.2002
360 * \param sochandle handle to socket to be used for connection establishment
361 * \param ip remote IP address to connect to
362 * \param rport remote port number to connect to
363 * \param myport local port to use for connection. This value can be
364 * specified directly or, if a value of 0 is given, TCP module will
365 * determine local TCP port automatically.
366 * \return
367 * \li -1 - Error
368 * \li >=0 - OK (Connection establishment procedure started. Socket handle
369 * returned.)
370 *
371 * Invoke this function to start connection establishment procedure towards
372 * remote host over some socket. This is only possible if socket was
373 * defined as either #TCP_TYPE_CLIENT or #TCP_TYPE_CLIENT_SERVER. Function
374 * will make some basic checks and if everything is OK, corresponding tcb
375 * socket entry will be initialized and connection procedure started.
376 */
377 INT8 tcp_connect (INT8 sochandle, UINT32 ip, UINT16 rport, UINT16 myport )
378 {
379 struct tcb* soc;
380
381 TCP_DEBUGOUT("FUNCTION: tcp_connect\r\n");
382
383 if( NO_OF_TCPSOCKETS < 0 )
384 return(-1);
385
386 if( NO_OF_TCPSOCKETS == 0 )
387 return(-1);
388
389 if( sochandle > NO_OF_TCPSOCKETS ) {
390 TCP_DEBUGOUT("Socket handle non-valid\r\n");
391 return(-1);
392 }
393
394 if( sochandle < 0 ) {
395 TCP_DEBUGOUT("Socket handle non-valid\r\n");
396 return(-1);
397 }
398
399 /* Is the local port defined */
400
401 if( myport == 0 )
402 myport = tcp_getfreeport();
403
404 if( myport == 0 )
405 return(-1);
406
407 soc = &tcp_socket[sochandle]; /* Get referense */
408
409 /* Do we have client properties? */
410
411 if( (soc->type & TCP_TYPE_CLIENT) == 0 ) {
412 TCP_DEBUGOUT("Socket has no client properties\r\n");
413 return(-1);
414 }
C51 COMPILER V7.06 TCP 11/26/2004 11:32:45 PAGE 8
415
416 if( soc->event_listener == 0) {
417 TCP_DEBUGOUT("ERROR:No event listener function specified\r\n");
418 return(-1);
419 }
420
421 /* Are we on LISTENING, RESERVED or CLOSED state */
422
423 if( (soc->state != TCP_STATE_RESERVED) &&
424 (soc->state != TCP_STATE_LISTENING) &&
425 (soc->state != TCP_STATE_CLOSED) ) {
426 TCP_DEBUGOUT("Socket on unvalid state to initialize CONNECT\r\n");
427 return(-1);
428 }
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