root/lang/ruby/misc/usukod

#!/usr/bin/env ruby
require 'socket'
unless FileTest.exist?('/tmp/usk.png')
  system('curl http://www.kanasansoft.com/usuko/usuko-original-large.png 1>/tmp/usk.png 2>/dev/null')
end
gs = TCPServer.open(6110)
puts "server is on #{gs.addr.inspect}"

loop do
  Thread.start(gs.accept) do |s|
    puts "#{s.addr.inspect} is accepted"
    pid = fork {
      STDERR.reopen(File.open('/dev/null', 'w'))
      exec ['qlmanage']*2, '-p', '/tmp/usk.png'
    }
    sleep 2
    Process.kill(:TERM, pid)

    puts "> #{line}"
    puts "#{s.addr.inspect} is gone"
    s.close
  end
end