Problem with select() I think

[elsayed_mazen]

I want to ask something about WinSock. I use it to make connection-Oriented program, I make "PREPARING" for the client and server socket: socket(); setsockopt(SO_RCVTIMEO); set IP address and port for the socket; and finally bind();

For the client, connect(); send(); and there is no SOCKET_ERROR.

Then, for the server, I make listen(); and then the following code:

while(TRUE)
{
iRet=0;
iRet = select(2,&serverReadFD,NULL,NULL,&selectTimeout);
if(iRet == SOCKET_ERROR)
{
AfxMessageBox("ERROR SOCKET SELECT");
closesocket(serverSocket);
return 0;
}
else if(iRet >0)
{
if(FD_ISSET(serverSocket,&serverReadFD))
{
int addrLength=sizeof(sockaddr);
clientConnection = accept(serverSocket,
(struct sockaddr*)&connectionInfo,&addrLength);
if(clientConnection == INVALID_SOCKET)
{
AfxMessageBox("ERROR SOCKET ACCEPT");
closesocket(clientConnection);
closesocket(serverSocket);
return 0;
}
FD_SET(clientConnection,&mainReadFD);
}
else
{
//
iRet = recv(clientConnection,msgData,sizeof(msgData),0);
if(iRet == SOCKET_ERROR)
{
AfxMessageBox("ERROR SOCKET RECEIVE");
closesocket(clientConnection);
closesocket(serverSocket);
return 0;
}
else if(iRet >0)
{
//AfxMessageBox("IN SOCKET RECEIVE");
CString tmp;
tmp.Format("%d",_T(msgData));
::PostMessage(data->mainHandler,WM_DATA_MSG,
(WPARAM)AllocBuffer(tmp),0);
tmp.Insert(0,"REPLAY: ");
iRet = send(clientConnection,(const char*)tmp.GetString(),
tmp.GetLength(),0);
if(iRet == SOCKET_ERROR)
{
AfxMessageBox("ERROR SOCKET SEND");
closesocket(clientConnection);
closesocket(serverSocket);
return 0;
}
memset(msgData,'\0',sizeof(msgData));
}//END RECV CONNECTION
}
}// END SELECT SUCCESS
FD_ZERO(&serverReadFD);
serverReadFD=mainReadFD;
}//while(TRUE)

There is no SOCKET_ERROR either, but the server infinitly receive the Client message "There is no problem in the accept() function".

By debug, I saw that select() return every time the socket that make the connection with the client is ready to receive data.

about the send() functin code in the client thread, here is the code:


while(TRUE)
{
::PeekMessage(&threadMsg,NULL, WM_USER, WM_APP, PM_REMOVE);
if(threadMsg.message == WM_SEND_MSG)
{
iRet = send(clientSocket, (const char*)threadMsg.wParam,
sizeof(threadMsg.wParam), 0);
if( iRet == SOCKET_ERROR )
{
AfxMessageBox("ERROR SOCKET SEND FROM CLIENT");
errorMsgHandler(data->mainHandler, WSAGetLastError());
closesocket(clientSocket);
return 0;
}
}
}//END WHILE (TRUE)

HELP ME PLEASE . . . .

[kuphryn]

What is the problem? Sounds like a design or logic error. Check your I/O design.

Kuphryn

[elsayed_mazen]

Forget that problem I Solve it. But I want to nknow how to deal with select(), when I want to listen and accept multi sucket.

Another thing is how to connect to a certain server socket "PORT" and make send and receive to the "ACCEPTED" socket in another port. for example, the server port is 2222 and I want to make a connect() as a client with the server in the port 5555. HOW TO MAKE THIS POSSIBLE???