--- File.link(old, new)

    old ؤ new Ȥ̾Υϡɥ󥯤
    ޤold ϤǤ¸ߤƤɬפޤ

    ϡɥ󥯤 0 ֤ޤԤ㳰 
    Errno::EXXX ȯޤ

