Lib lttng-ctl data available command support

[lttng-tools.git] / include / lttng / lttng.h

diff --git a/include/lttng/lttng.h b/include/lttng/lttng.h
index dd5d936c5faaed64910f4220e04025b691606028..4171cde41c998d123fac3b407a337ec622b42cfe 100644 (file)
--- a/include/lttng/lttng.h
+++ b/include/lttng/lttng.h
@@ -29,6 +29,10 @@
 /* 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.
  */
@@ -257,6 +261,7 @@ struct lttng_event_field {
        enum lttng_event_field_type type;
        char padding[LTTNG_EVENT_FIELD_PADDING];
        struct lttng_event event;
+       int nowrite;
 };
 
 /*
@@ -576,4 +581,18 @@ 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) hence not ready to be used by
+ * any readers.
+ *
+ * Return 0 if the data is _NOT_ available else 1 if the data is ready. On
+ * error, a negative value is returned and readable by lttng_strerror().
+ */
+extern int lttng_data_available(const char *session_name);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* LTTNG_H */