trace: add "-trace events" argument to control initial state
The "-trace events" argument can be used to provide a file with a list of trace
event names that will be enabled prior to starting execution, thus providing
early tracing.
This saves the user from manually toggling event states through the monitor
interface or whichever backend-specific interface.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
diff --git a/trace/control.h b/trace/control.h
index c99b4d5..2acaa42 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -24,10 +24,18 @@
/** Initialize the tracing backend.
*
- * @file Name of trace output file; may be NULL.
- * Corresponds to commandline option "-trace file=...".
+ * @events Name of file with events to be enabled at startup; may be NULL.
+ * Corresponds to commandline option "-trace events=...".
+ * @file Name of trace output file; may be NULL.
+ * Corresponds to commandline option "-trace file=...".
* @return Whether the backend could be successfully initialized.
*/
-bool trace_backend_init(const char *file);
+bool trace_backend_init(const char *events, const char *file);
+
+/** Generic function to initialize the state of events.
+ *
+ * @fname Name of file with events to enable; may be NULL.
+ */
+void trace_backend_init_events(const char *fname);
#endif /* TRACE_CONTROL_H */
