module DEBUGGER__

def self.unix_domain_socket_dir
  case
  when path = CONFIG[:sock_dir]
  when path = ENV['XDG_RUNTIME_DIR']
  when path = unix_domain_socket_tmpdir
  when path = unix_domain_socket_homedir
  else
    raise 'specify RUBY_DEBUG_SOCK_DIR environment variable.'
  end
  path
end