Programming Forums - how to check if the socket is still connected?

In my program, i have a socket that always connected to server.

I whish to check the socket is still connected to server everytime message send through the socket..

How to do this?



// Initialize Winsock.

WSADATA wsaData;

int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );

if ( iResult != NO_ERROR )

{

 return;

}



// Create a socket.

g_SocketPoll = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );

//Check for errors to ensure that the socket is a valid socket.

if ( g_SocketPoll == INVALID_SOCKET )

{



   WSACleanup();//terminate the use of the WS2_32 DLL



    return;

}



// Connect to a server.

sockaddr_in clientService;



clientService.sin_family = AF_INET;

clientService.sin_addr.s_addr = inet_addr( g_sIPAddress.c_str() );

clientService.sin_port = htons( g_nPort );



if ( connect( g_SocketPoll, (SOCKADDR*) &clientService, sizeof(clientService) ) == SOCKET_ERROR) 

{

                        

        WSACleanup();



        return;

}

        

//decide to have a while loop here to check if the socket is still connected?



while( true )

{

  bytesSent = send( g_SocketPoll, sLine.c_str(), strlen(sLine.c_str()), 0 );



}