WSAEWOULDBLOCK and WSAEISCONN

[hardi]

Hello.

I wrote this code:

SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
sockaddr_in socket_address;
//snip - initialize the socket_address' members - snip//
int status = 1;
ioctlsocket(sock, FIONBIO, &status);  //set the socket in non-blocking mode
while (1)
{
   int ret = connect(sock, (sockaddr*)(&socket_address), sizeof(socket_address));
   if (ret == -1)
   {
       cout << "Connection error : " << WSAGetLastError() << endl;
       Sleep(50);  //wait a bit to not hang the CPU
   }
   else
   {
       cout << "Connection succeeded" << endl;
       break;
   }
}

I get this output:
WSAEWOULDBLOCK - the connect function would block, try again later
WSAEISCONN - the socket is already connected, why are you trying to connect it again?

(ofcourse the output is written in numbers, but I translated the error codes and added my comments on what they mean imho).

So, what's wrong(firt it says: try again later, but later, it says that the socket is already connected)?

[OnionKnight]

Don't connect() with the socket again. To find out when the connection is established you can check if the socket is writable or use asynchronous sockets.