enum ioctl_type

enum ioctl_type {
    IOCTL_UNKNOWN,
    IOCTL_INT,
    IOCTL_TIMEVAL,
    IOCTL_TIMESPEC,
    IOCTL_IFREQ,
    IOCTL_IFCONF,
    IOCTL_ARPREQ,
    IOCTL_SGIO,
    IOCTL_HWTSTAMP_CONFIG,
    IOCTL_PTP_CLOCK_CAPS,
    IOCTL_PTP_SYS_OFFSET,
    IOCTL_PTP_SYS_OFFSET_EXTENDED,
    IOCTL_PTP_SYS_OFFSET_PRECISE,
};