C socket UDP way to send data

#defineHost_server_ip "192.168.3.35"#defineHost_port 9501#defineSleep_time 1#defineLoop_time 3#defineData_size 80intjudge_socket_exist () {intLoop_time =0;    Fd_set Send_data_flag; Static intSOCKET_FD =-1;  while(1)    {        if(SOCKET_FD <=0) {socket_fd= Socket (Af_inet, SOCK_DGRAM,0); Loop_time++; }        if(Socket_fd >0) {Fd_zero (&Send_data_flag); Fd_set (SOCKET_FD,&Send_data_flag); Fd_set (0, &Send_data_flag); //Check socket is effective            if(Select(socket_fd+1, NULL, &send_data_flag, NULL,0) >0)            {                 Break; }            Else{socket_fd= Socket (Af_inet, SOCK_DGRAM,0); Loop_time++; }        }        if(Loop_time >loop_time) {            return-1;    } sleep (Sleep_time); }    returnsocket_fd;}intGsh_post_client (Const Char* SN,Const Char*IP) {    if(NULL = = SN | | NULL = =IP) {        return-1; }    intLoop_time =0;//loop time of fail execute    intSend_data_length =0;//length of sending data    intSelect_err =-1;//Flag of Select function back value    intSOCKET_FD = Judge_socket_exist ();//set socket flag, socket not close    structTimeval select_wait = {1,0};//Select function Wait time    CharText[bufsiz]; CharSend_data_buffer[data_size];//buffer of sending data    structSockaddr_in socket_addr;//socket address of server IP and portFd_set Send_data_flag;//Select function Send data flag    if(SOCKET_FD <=0) {fprintf (stderr,"Establish socket fail"); return-1; }    //Initialize socket dataBzero (&AMP;SOCKET_ADDR,sizeof(SOCKET_ADDR)); Socket_addr.sin_family=af_inet; Socket_addr.sin_port=htons (Host_port); Inet_aton (HOST_SERVER_IP,&socket_addr.sin_addr); //Initialize request datamemset (&send_data_buffer,0,sizeof(Send_data_buffer)); strcat (Send_data_buffer,"sn=");    strcat (Send_data_buffer, SN); strcat (Send_data_buffer,"&ip=");    strcat (Send_data_buffer, IP);  while(1)//For no-blocking    {        if(Loop_time >loop_time) {fprintf (stderr,"Send data fail\n"); return-1; } Fd_zero (&Send_data_flag); Fd_set (SOCKET_FD,&Send_data_flag); Fd_set (0, &Send_data_flag); Select_err=Select(socket_fd+1, NULL, &send_data_flag, NULL, &select_wait); if(Select_err <=0) {Loop_time++; }        Else        {            if(Fd_isset (SOCKET_FD, &Send_data_flag)) {Loop_time=0; FD_CLR (SOCKET_FD,&Send_data_flag);  while(Send_data_length <strlen (Send_data_buffer)) {Send_data_length= SendTo (SOCKET_FD, Send_data_buffer, strlen (Send_data_buffer),0, (structSOCKADDR *) &socket_addr,sizeof(SOCKET_ADDR)); if(Send_data_length <=0) {fprintf (stderr,"Sending data fail\n"); return-1; }                    if(Loop_time >loop_time) {fprintf (stderr,"length of sending data shorten than data\n"); return-1; }                    if(Send_data_length <strlen (Send_data_buffer)) {Loop_time++;                    Sleep (Sleep_time); }                }
Recvfrom (Socket_fd,text,sizeof(text),0, NULL, NULL); printf ("%s", text);
                 Break; }            Else{loop_time++;    }} sleep (Sleep_time); }    return 0;}

C socket UDP way to send data