--- BasicSocket.for_fd(fd)           ruby 1.7 feature

    եǥץ fd Ф뿷åȤޤ

    ruby 1.7 feature:
    Υ᥽åɤ Socket 饹餳Υ饹˰ưޤ
    ˤꡢǤդΥåȤǤ fd б륽
    ȥ饹뤳ȤǤޤ

