UDP Select() TCP

[themadme]

hi. ok my problem is that i have been using TCP for a while and now i want to change to UDP. Im using the select I/0 method.

i have a listening thread like this :
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1. void Server::vListeningThread( LPVOID pParam )
2. {
3. Server *pServer = (Server*)pParam;
4. SOCKET socketClient;
5. do
6. {
7. socketClient = accept( *pServer->p_socketServer, 0, 0 );
8.
9. if ( socketClient == SOCKET_ERROR || pServer->usNumberOfClients >= pServer->usMAX_CLIENTS )
10. {
11. // send an error code to client //////////////////////////////////////
12. closesocket( socketClient );
13. }
14. else
15. {
16. WaitForSingleObject( pServer->handleMutex, INFINITE );
17. FD_SET( socketClient, &pServer->fdsetMaster );
18. ReleaseMutex( pServer->handleMutex );
19. pServer->usNumberOfClients++;
20. }
21.
22. }while( pServer->bConnected );
23.
24. }



now im unsure how to change it into UDP.

does the new socket of data that has been sent go straight into the FD_SET? Therefore when im polling through the set i would have to check if it has been set or not?

Please help, im a little bit confused with this?

thanks

[themadme]

TCP version:

Server *pServer = (Server*)pParam;
    SOCKET socketClient;
    do
    {
        socketClient = accept( *pServer->p_socketServer, 0, 0 );
 
        if ( socketClient == SOCKET_ERROR || pServer->usNumberOfClients >= pServer->usMAX_CLIENTS ) 
        {
            // send an error code to client //////////////////////////////////////
            closesocket( socketClient );
        }
        else 
        {
            WaitForSingleObject( pServer->handleMutex, INFINITE );
            FD_SET( socketClient, &pServer->fdsetMaster );
            ReleaseMutex( pServer->handleMutex );
            pServer->usNumberOfClients++;
        }
 
    }while( pServer->bConnected );

and then later

int SelectResult = select( 0, &fdsetPolling, NULL, NULL, &timevalWait );
 
            if ( SelectResult || SelectResult != SOCKET_ERROR ) 
            {
                for ( USHORT usLoop = 0; usLoop < fdsetPolling.fd_count; usLoop++ ) 
                {
                    ///** ok everythings is ok.  Now to get the socket with new data **//////
                    C_PacketData.vSetSocketData( fdsetPolling.fd_array[ usLoop ] );
 
                    ///** hnow receiver the data from that socket **//////
                    int Retrieved = recv( tempSocket, (char*)&C_PacketData, pServer->uPACKET_SIZE, 0 );
}
}

so for UDP i would i just delete the first part and for the second part i would add in this

FS_ISSET( fdsetPolling.fd_array[ usLoop ], fdsetPolling )

before i call C_PacketData.vSetSocketData( fdsetPolling.fd_array[ usLoop ] );

correct me if im wrong or missing out something?

thanks

[Banfa]

Sorry I've been holding off because on the whole I only use TCP sockets so I am not so familiar with UDP.

I see nothing about the select(...) function that precludes using it on a UDP socket. Clear since UDP is connectionless you can not accept(...) a connection.

A good place to start may be the Wikipedia article on Berkley sockets..

[themadme]

thank you, much appreciated.