Linux C++ TCP Socket - Enable Blocking Mode

Question

Amazingly, I have had a hard time finding an answer to this..

I have a TCP client socket that I can successfully connect with and send data through. However, after sending data, I'm expecting a response to be returned from the server. I checked my socket and it would appear that it is in non blocking mode.

if (fcntl(sc->connect_d, F_GETFL) && O_NONBLOCK)
{
//non blocking
}

What is the macro for enabling blocking mode so I can read the server response a little easier? Can somebody give me a small snippet that can do this? Thanks

Answer 1

if (fcntl(sc->connect_d, F_GETFL) && O_NONBLOCK)

The above code is incorrect. It should be:

if (fcntl(sc->connect_d, F_GETFL) & O_NONBLOCK)

Note that TCP sockets are created in blocking mode by default, so (assuming you created the socket yourself) you shouldn't need to do anything to "put it into" blocking mode.