X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=include%2Flttng%2Flttng.h;h=c6fc60558ae833a5fe011147d24ec75f10b20b5c;hp=a9aee7233e7307735982c951b937ed5c2012d38e;hb=025faf73cdb6942ebf437dc4c4f6631f0134b128;hpb=5168918c35a95e9d955fa4efb6533aaafe05b2e5

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index a9aee7233..c6fc60558 100644
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -261,6 +261,7 @@ struct lttng_event_field {
 	enum lttng_event_field_type type;
 	char padding[LTTNG_EVENT_FIELD_PADDING];
 	struct lttng_event event;
+	int nowrite;
 };
 
 /*
@@ -471,9 +472,20 @@ extern int lttng_start_tracing(const char *session_name);
 
 /*
  * Stop tracing for *all* registered traces (kernel and user-space).
+ *
+ * This call will wait for data availability for each domain of the session so
+ * this can take an abritrary amount of time. However, when returning you have
+ * the guarantee that the data is ready to be read and analyse. Use the
+ * _no_wait call below to avoid this behavior.
  */
 extern int lttng_stop_tracing(const char *session_name);
 
+/*
+ * Behave exactly like lttng_stop_tracing but does not wait for data
+ * availability.
+ */
+extern int lttng_stop_tracing_no_wait(const char *session_name);
+
 /*
  * Add context to event(s) for a specific channel (or for all).
  *
@@ -497,16 +509,18 @@ extern int lttng_enable_event(struct lttng_handle *handle,
 		struct lttng_event *ev, const char *channel_name);
 
 /*
- * Apply a filter expression to an event.
+ * Create or enable an event with a specific filter.
  *
- * If event_name is NULL, the filter is applied to all events of the channel.
- * If channel_name is NULL, a lookup of the event's channel is done.
- * If both are NULL, the filter is applied to all events of all channels.
+ * If the event you are trying to enable does not exist, it will be created,
+ * else it is enabled.
+ * If event_name is NULL, all events are enabled with that filter.
+ * If channel_name is NULL, the default channel is used (channel0) and created
+ * if not found.
  */
-extern int lttng_set_event_filter(struct lttng_handle *handle,
-		const char *event_name,
-		const char *channel_name,
+extern int lttng_enable_event_with_filter(struct lttng_handle *handle,
+		struct lttng_event *event, const char *channel_name,
 		const char *filter_expression);
+
 /*
  * Create or enable a channel.
  * The channel name cannot be NULL.
@@ -580,6 +594,18 @@ extern int lttng_disable_consumer(struct lttng_handle *handle);
  */
 extern int lttng_health_check(enum lttng_health_component c);
 
+/*
+ * For a given session name, this call checks if the data is ready to be read
+ * or is still being extracted by the consumer(s) (pending) hence not ready to
+ * be used by any readers.
+ *
+ * Return 0 if there is _no_ data pending in the buffers thus having a
+ * guarantee that the data can be read safely. Else, return 1 if there is still
+ * traced data is pending. On error, a negative value is returned and readable
+ * by lttng_strerror().
+ */
+extern int lttng_data_pending(const char *session_name);
+
 #ifdef __cplusplus
 }
 #endif