X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=include%2Flttng%2Flttng.h;h=9e2d4d129894878631d38452f05bc5ffc25c946a;hp=b1c828924b560fd4375e7e8f828c9454b20e56fa;hb=178191b3899f114001f000c2e7f46909969f9c6f;hpb=cc2089fd7af3feb0c54c8d80e60eaa792f11de61

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index b1c828924..9e2d4d129 100644
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -19,13 +19,20 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#ifndef _LTTNG_H
-#define _LTTNG_H
+#ifndef LTTNG_H
+#define LTTNG_H
 
 #include <limits.h>
 #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.
  */
@@ -118,6 +125,7 @@ enum lttng_event_context_type {
 	LTTNG_EVENT_CONTEXT_PPID              = 8,
 	LTTNG_EVENT_CONTEXT_VPPID             = 9,
 	LTTNG_EVENT_CONTEXT_PTHREAD_ID        = 10,
+	LTTNG_EVENT_CONTEXT_HOSTNAME          = 11,
 };
 
 enum lttng_calibrate_type {
@@ -253,6 +261,7 @@ struct lttng_event_field {
 	enum lttng_event_field_type type;
 	char padding[LTTNG_EVENT_FIELD_PADDING];
 	struct lttng_event event;
+	int nowrite;
 };
 
 /*
@@ -463,9 +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).
  *
@@ -491,14 +511,14 @@ extern int lttng_enable_event(struct lttng_handle *handle,
 /*
  * Apply a filter expression to an event.
  *
- * If event_name is NULL, the filter is applied to all events of the channel.
+ * If event 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,
+		struct lttng_event *event, const char *channel_name,
 		const char *filter_expression);
+
 /*
  * Create or enable a channel.
  * The channel name cannot be NULL.
@@ -572,4 +592,20 @@ extern int lttng_disable_consumer(struct lttng_handle *handle);
  */
 extern int lttng_health_check(enum lttng_health_component c);
 
-#endif /* _LTTNG_H */
+/*
+ * 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 */