X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=include%2Flttng%2Flttng.h;h=515e07c4e9703653c600e633d887ccae6f194957;hp=cb3562ffdf601f66274ffef2bd7252450184e3a2;hb=52df24019c3998b87870fb8371fa20fb33449a0d;hpb=54773d681e44cb32d6923bd2db0dcecd4bd10079

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index cb3562ffd..515e07c4e 100644
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -26,6 +26,13 @@
 #include <stdint.h>
 #include <sys/types.h>
 
+/* Error codes that can be returned by API calls */
+#include <lttng/lttng-error.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * Event symbol length. Copied from LTTng kernel ABI.
  */
@@ -254,6 +261,7 @@ struct lttng_event_field {
 	enum lttng_event_field_type type;
 	char padding[LTTNG_EVENT_FIELD_PADDING];
 	struct lttng_event event;
+	int nowrite;
 };
 
 /*
@@ -464,9 +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).
  *
@@ -490,16 +509,20 @@ 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.
- */
-extern int lttng_set_event_filter(struct lttng_handle *handle,
-		const char *event_name,
-		const char *channel_name,
+ * 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.
+ * If filter_expression is NULL, an event without associated filter is
+ * created.
+ */
+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.
@@ -573,4 +596,20 @@ 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
+
 #endif /* LTTNG_H */