Ruby get UDPSocket port number

Question

I am trying get the port number after I have bind my UDPSocket to a free port number. so

udp_server = UDPSocket.new

udp_server.bind('localhost', 0)

So I am passing a 0 here to let udp_server randomly pick a free port number for me.

Is it possible to get the port number after doing the bind? Say something like

udp_server.get_port_number

I have searched online but didn't find a solution.

Thanks a lot!

Answer 1

应该这样做：

udp_server.addr[1]