--- Socket.sockaddr_in(port, host)       ruby 1.7 feature
--- Socket.pack_sockaddr_in(port, host)  ruby 1.7 feature

    ꤷɥ쥹򥽥åȥɥ쥹¤Τ pack ʸ
    ֤ޤport ϡݡֹɽ Fixnum 뤤ϡݡ
    ֹ桢ӥ̾ɽʸǤ

        require 'socket'
        p Socket.pack_sockaddr_in("echo", "localhost")
        => "\002\000\000\a\177\000\000\001\000\000\000\000\000\000\000\000"

