Question

I have just compiled this code:
http://www.win32developer.com/tutorial/winsock/winsock_tutorial_2.shtm

I have added some codes so it does recv(), in an infinite loop. My problem, if there is no data to read, it still does not block.

Am I totally mistaken if I think recv should block in my case?

The code I have added is:

for(;;)
{
  char buffer[1000];
  memset(buffer,0,999);
  int inDataLength = recv(Socket,buffer,1000,0);

  int nError=WSAGetLastError();
  if(nError!=WSAEWOULDBLOCK&&nError!=0)
  {
    std::cout<<"Winsock error code: "<<nError<<"\r\n";
    std::cout<<"Client disconnected!\r\n";

    // Shutdown our socket
    shutdown(Socket,SD_SEND);

    // Close our socket entirely
    closesocket(Socket);

    break;
  }
}

It is at the end, after the std::cout<<"Client connected!\r\n\r\n"; line.
I know I copied this from a “non blocking” example, but I dont think this code should do anything nonblocking really, still, my for loop is running like mad!

Answer 1

if((nError == SOCKET_ERROR) || (nError == 0))
    WSAGetLastError();
else
    ; // handle success

That’s how it should look, and not how you did it.