--- Socket.unpack_sockaddr_un(addr)      ruby 1.7 feature

    åȥɥ쥹¤Τ pack ʸ 
    unpack åȥѥ֤̾ޤ

        require 'socket'
        p Socket.unpack_sockaddr_un(Socket.pack_sockaddr_un("/tmp/.X11-unix/X0"))
        => "/tmp/.X11-unix/X0"

