From: Bill Kelly <billk@...>
Date: 2004-05-12T07:36:31+09:00
Subject: Re: UDP socket

Hi,

From: "PeeF" <peefh@wanadooZZZ.fr>
> Hello.
> 
> I'm looking for the source code of any existing and running program whitch
> makes use of UDP Sockets.
> Please could you help me to find some?

I use this to send commands (status and rcon) to Quake 2 servers:

  UDP_RECV_TIMEOUT = 3  # seconds

  def q2cmd(str)
    resp, sock = nil, nil
    begin
      cmd = "\377\377\377\377#{str}\0"
      sock = UDPSocket.open
      sock.send(cmd, 0, @server_addr, @server_port)
      resp = if select([sock], nil, nil, UDP_RECV_TIMEOUT)
        sock.recvfrom(65536)
      end
      if resp
        resp[0] = resp[0][4..-1]  # trim quake's leading 0xffffffff
      end
    rescue IOError, SystemCallError
    ensure
      sock.close if sock
    end
    resp
  end


Hope this helps,

Regards,

Bill