Determine between socket and fd

Question

On unix everything is a file approach of function read(), write(), close() is not supported on Win32.

I

Answer 1

I suspect... but I am not sure, that fds and sockets on Windows use separate namespaces. Therefore the number for a socket and a file could be the same, and it is impossible to know which one you are talking about when you call is_net_socket.

Try printing out socket and fd numbers to see if they are ever the same as each other at the same time.