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   源码介绍

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int32_t loopback_tcps(uint8_t sn, uint8_t* buf, uint16_t port, uint8_t loopback_mode)  //2020-03-11
{
    int32_t ret;
    int8_t status,inter;
    uint8_t tmp = 0;
    datasize_t received_size;
    uint8_t arg_tmp8;
      
        getsockopt(sn, SO_STATUS, &status);  // »ñÈ¡socket snµÄ״̬  2020-03-11
        switch(status)
    {
                    
      case SOCK_ESTABLISHED :   // ´¦ÓÚSOCK_ESTABLISHED״̬£¬¿ÉÒÔ½øÐÐÊÕ·¢  2020-03-11
         ctlsocket(sn,CS_GET_INTERRUPT,&inter);   // ¶ÁÈ¡ÖжÏ2020-03-11 inter=getSn_IR(sn);  µÈЧ¿ÉÌæ»»
         if(inter & Sn_IR_CON)       // Á¬½ÓÖжϲúÉú±íʾ£¬TCPÁ¬½Ó³É¹¦£¬ÖжÏÏ£¬ÆäËüÄÚÈݿɸù¾ÝÐèÒªÌí¼Ó»òɾ³ý 2020-03-11
         {
           arg_tmp8 = Sn_IR_CON;
           ctlsocket(sn,CS_CLR_INTERRUPT,&arg_tmp8); // »Øд£¬Çå³ýÖжϱê¼Ç£¬½øÈëÁ¬½ÓÖжϺóÐèÒªÇå³ý¡£2020-03-11
         }
            
       
                 getsockopt(sn, SO_RECVBUF, &received_size); // ÅжÏsocketÓÐûÓнÓÊܵ½Êý¾Ý£ºÍ¬ received_size=getSn_RX_RSR(sn);µÈЧ¿ÉÌæ»» 2020-03-11
                 if(received_size>0)
                 {     
           ret = recv(sn, buf, received_size);  //½«»º´æÖÐÊÕµ½µÄÊý¾Ý·ÅÈëbufÖУsreceived_sizeÊÇÏ£ÍûÊÕµ½µÄÊý¾Ý£¬·µ»ØretÊÇʵ¼ÊÊÕµ½µÄÊý¾Ý 2020-03-11     
                     ret = send(sn, buf, ret);   // ·¢Ëͺ¯Êý£¬·¢ËÍbufÖ㤶ÈΪretµÄÊý¾Ý 2020-03-11
                 }      
       break;
                        
                        
                        
       case SOCK_CLOSE_WAIT :   // ¸Ã״̬¼´½«¹Ø±Õ£¬ µ«»¹´¦ÓÚÁ¬½Ó״̬£¬ÏÈ´¦ÀíÍêÊÕ·¢ºó£¬ÔÙ»ØDISCONÃüÁÍê³É4´Î»ÓÊÖ¡£

         ret = recv(sn, buf, received_size);  //½«»º´æÖÐÊÕµ½µÄÊý¾Ý·ÅÈëbufÖУsreceived_sizeÊÇÏ£ÍûÊÕµ½µÄÊý¾Ý£¬·µ»ØretÊÇʵ¼ÊÊÕµ½µÄÊý¾Ý 2020-03-11
               if(ret>0)  //bufÖеÄÊý¾Ý´óÓÚ0£¬¿ÉÒÔÆô¶¯·¢ËÍ
                 {     
                        ret = send(sn, buf, ret);   // ·¢Ëͺ¯Êý£¬·¢ËÍbufÖ㤶ÈΪretµÄÊý¾Ý
                 }      
          if((ret = disconnect(sn)) != SOCK_OK) return ret;   //  µ÷ÓÃDISCONÃüÁÍê³É4´Î»ÓÊÖ¡£2020-03-11

          break;
                 
       case SOCK_INIT :    //SOCK³õʼÍê³É £¬ÅäÖÃΪTCP״̬³É¹¦ 2020-03-11
          if( (ret = listen(sn)) != SOCK_OK)  // ÅäÖÃΪ·þÎñÆ÷ģʽ 2020-03-11
                    return ret;
         break;
                    
       case SOCK_CLOSED:     // ´¦ÓÚCLOSE״̬£¬ÐèÒªÅäÖÃSOCKETº¯Êý  2020-03-11    
         switch(loopback_mode)  // Ö§³ÖIPV4 ,IPV6  IPV4/IPV6 3ÖÖģʽ  
         {
             case AS_IPV4:
                tmp = socket(sn, Sn_MR_TCP4, port, SOCK_IO_NONBLOCK); //ÅäÖÃsocket 2020-03-11  
                               printf("\r\nW6100 IPV4 Server port: %d\r\n",port); //´òÓ¡ÅäÖÃsocket 2020-03-11
               break;
             case AS_IPV6:
                tmp = socket(sn, Sn_MR_TCP6, port, SOCK_IO_NONBLOCK); //ÅäÖÃsocket 2020-03-11
                            printf("\r\nW6100 IPV6 Server port: %d\r\n",port); //´òÓ¡ÅäÖÃsocket 2020-03-1
               break;
             case AS_IPDUAL:
                tmp = socket(sn, Sn_MR_TCPD, port, SOCK_IO_NONBLOCK); //ÅäÖÃsocket 2020-03-11
                printf("\r\nW6100 IPV4/IPV6 Server port: %d\r\n",port); //´òÓ¡ÅäÖÃsocket 2020-03-11                         
               break;
             default:
               break;
         }                
                                
         if(tmp != sn)    /* reinitialize the socket */
         {
             #ifdef _LOOPBACK_DEBUG_
                printf("%d : Fail to create socket.\r\n",sn);
             #endif
           return SOCKERR_SOCKNUM;
         }
         break;
                    
        default:
          break;
                
       }
    return 1;
}