Test for IO.select bug as seen with jruby on aix

io-select-test.rb

## simple test to check for broken IO.select behavior as seen with jruby on aix using java6 or java7
##

require 'socket'

begin
  port = ARGV.shift || '4321'
  server = TCPServer.new('localhost', port)
  client = TCPSocket.new('localhost', port)

  sock = server.accept
  readables, writeables, errors = IO.select([sock], [sock], [sock], 0)

  # At this point there shouldn't be anything on the socket for us to read
  fail 'IO.select seems to be broken for this system!' if (readables && readables.any?)

  puts 'It appears that IO.select may be functioning correctly on this system'

ensure
  server.close if server
  client.close if client
end