: int rb_io_mode_flags(const char *mode);

    fopen(3)Τ褦ʥ⡼ɻmoderubyΥ⡼ɥե饰
    Ѵޤ

    modeϡ[rwa][b][+]ȤʸǤ(: "rb+")
    ͤϡ
    FMODE_READABLE,
    FMODE_WRITABLE,
    FMODE_BINMODE,
    FMODE_READWRITE
    ¤ǤFMODE_READWRITEϡFMODE_READABLE
    FMODE_WRITEABLE¤Ǥ

