-int kernctl_set_stream_id(int fd, unsigned long *stream_id);
-int kernctl_get_net_stream_id_offset(int fd, unsigned long *offset);
+int kernctl_buffer_flush_empty(int fd);
+int kernctl_buffer_clear(int fd);
+int kernctl_get_metadata_version(int fd, uint64_t *version);
+int kernctl_metadata_cache_dump(int fd);
+
+/* index */
+int kernctl_get_timestamp_begin(int fd, uint64_t *timestamp_begin);
+int kernctl_get_timestamp_end(int fd, uint64_t *timestamp_end);
+int kernctl_get_events_discarded(int fd, uint64_t *events_discarded);
+int kernctl_get_content_size(int fd, uint64_t *content_size);
+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_sequence_number(int fd, uint64_t *seq);
+int kernctl_get_instance_id(int fd, uint64_t *seq);