-int marker_format_event(LttTrace *trace, GQuark name, const char *format);
-int marker_id_event(LttTrace *trace, GQuark name, guint16 id,
+int marker_format_event(LttTrace *trace, GQuark channel, GQuark name,
+ const char *format);
+int marker_id_event(LttTrace *trace, GQuark channel, GQuark name, guint16 id,