int kernctl_get_packet_size(int fd, uint64_t *packet_size);
int kernctl_get_stream_id(int fd, uint64_t *stream_id);
int kernctl_get_current_timestamp(int fd, uint64_t *ts);
int kernctl_get_packet_size(int fd, uint64_t *packet_size);
int kernctl_get_stream_id(int fd, uint64_t *stream_id);
int kernctl_get_current_timestamp(int fd, uint64_t *ts);