bool CD_Drive::is_open() {
        int slot;
        ioctl(this->fd, CDROM_DRIVE_STATUS, &slot);
        switch (slot) {
                case CDS_NO_INFO:
                        break;
                case CDS_NO_DISC:
                        break;
                case CDS_TRAY_OPEN:
                        return true;
                        break;
                case CDS_DRIVE_NOT_READY:
                        return true;
                        break;
                case CDS_DISC_OK:
                        break;
                default:
                        break;
        }
        return false;
}