Network.Socket.Free

Documentation

openFreePort :: IO (Int, Socket)

Open a TCP socket on a random free port. This is like warp's openFreePort.

Since 0.0.0.1

getFreePort :: IO Int

Open a TCP socket, get its port and close the socket. Useful when you have an external service that needs a fresh port.

There is a small race condition present: It's possible to get a free port only for it to be bound by some other process or thread before used

Since 0.2.1