class Selenium::WebDriver::PortProber

def self.above(port)
  port += 1 until free? port
  port
end

def self.free?(port)
  Platform.interfaces.each do |host|
    begin
      TCPServer.new(host, port).close
    rescue *IGNORED_ERRORS => ex
      WebDriver.logger.debug("port prober could not bind to #{host}:#{port} (#{ex.message})")
      # ignored - some machines appear unable to bind to some of their interfaces
    end
  end
  true
rescue SocketError, Errno::EADDRINUSE
  false
end

def self.random
  # TODO: Avoid this
  #
  # (a) should pick a port that's guaranteed to be free on all interfaces
  # (b) should pick a random port outside the ephemeral port range
  #
  server = TCPServer.new(Platform.localhost, 0)
  port   = server.addr[1]
  server.close
  port
end