--- syswrite(string)

    write(2) [manual page] Ѥ string Ϥޤ
    string ʸǤʤ to_s ˤʸ󲽤ߤޤ
    stdio ͳʤΤ¾νϥ᥽åɤȺѤȻפư
    򤹤뤳Ȥޤ

    ºݤ˽ϤǤХȿ֤ޤϤ˼Ԥ㳰 
    Errno::EXXX ȯޤ

