class DRb::DRbUNIXSocket

def self.parse_uri(uri)
  if /\Adrbunix:(.*?)(\?(.*))?\z/ =~ uri
    filename = $1
    option = $3
    [filename, option]
  else
    raise(DRbBadScheme, uri) unless uri.start_with?('drbunix:')
    raise(DRbBadURI, 'can\'t parse uri:' + uri)
  end
end