From: John Carter <john.carter@...>
Date: 2008-09-10T13:14:38+09:00
Subject: Ruby Bug? Windows and UDPSocket and Errno:ENOTCONN

If I have a pair of Win2k Ruby processes bouncing UDP packets back and
forth...

After awhile one of them dies with Errno::ENOTCONN

The code works under Linux but not under Win2k, neither on ruby-1.8.6
nor 1.8.7.

Any guesses? Suggestions? Workarounds?





John Carter                             Phone : (64)(3) 358 6639
Tait Electronics                        Fax   : (64)(3) 359 4632
PO Box 1645 Christchurch                Email : john.carter@tait.co.nz
New Zealand

======================================================================

#!/usr/bin/ruby -w
STDOUT.sync = true

require 'socket'


SERVER_PORT = 7272
CLIENT_PORT = 7373

SERVER_HOST = 'localhost'
CLIENT_HOST = 'localhost'

PACKET_LENGTH = 64

SLEEP_TIME = 3 #seconds

MESSAGE = "I say, boy, I resemble that remark!"

class AbstractDaemon

    def initialize(to_host, send_port, recv_port)
       @send_port = send_port
       @recv_port = recv_port
       @host = to_host
       @recv_socket = UDPSocket.new
       print "Listening on port: #{@recv_port}..."
       @recv_socket.bind(0, @recv_port)
       puts 'ok'
       @send_socket = UDPSocket.new
       print "Listening on port: #{@send_port}..."
       @send_socket.connect(0, @send_port)
       puts 'ok'
       do_stuff
    end

    def do_stuff
       raise Exception.new("Dummy method not implemented")
    end

    def send
       puts "Sending message: #{MESSAGE}"
       @send_socket.syswrite(MESSAGE)
    end

    def receive
       packet,address = *@recv_socket.recvfrom(PACKET_LENGTH)
       puts "Received message: #{packet}"
    end

    def pause
       print "Sleeping"
       SLEEP_TIME.times do
          print '.'
          sleep(1)
       end
       puts ""
    end


end

class Server < AbstractDaemon

    def initialize
       super(CLIENT_HOST, CLIENT_PORT, SERVER_PORT)
    end

    def do_stuff
       while true
          receive
          send
#         pause
       end
    end

end

class Client < AbstractDaemon

    def initialize
       super(SERVER_HOST, SERVER_PORT, CLIENT_PORT)
    end

    def do_stuff
       while true
          send
          receive
#         pause
       end
    end

end

if ARGV[0] == 'server'
    Server.new
elsif ARGV[0] == 'client'
    Client.new
else
    puts "Usage: #{$0} <client | server>"
end