-extern int lttng_create_session(char *name, uuid_t *session_id);
-extern int lttng_destroy_session(uuid_t *uuid);
-extern int lttng_connect_sessiond(void);
-extern int lttng_disconnect_sessiond(void);
-extern int lttng_set_tracing_group(const char *name);
-extern int lttng_check_session_daemon(void);
-extern const char *lttng_get_readable_code(int code);
-extern int lttng_ust_list_apps(pid_t **pids);
-extern int lttng_list_sessions(struct lttng_session **sessions);
-extern int lttng_list_traces(uuid_t *uuid, struct lttng_trace **traces);
-extern void lttng_set_current_session_uuid(uuid_t *uuid);
-extern int lttng_ust_create_trace(pid_t pid);
-extern int lttng_ust_start_trace(pid_t pid);
-extern int lttng_ust_stop_trace(pid_t pid);
+/*
+ * Calibrate LTTng overhead.
+ *
+ * The chan and handle params can not be NULL.
+ *
+ * Return 0 on success else a negative LTTng error code.
+ */
+extern int lttng_calibrate(struct lttng_handle *handle,
+ struct lttng_calibrate *calibrate);