trace: add trace_event_iter_init_group

This allows to interate over an event group.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20210601132414.432430-4-kraxel@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/trace/control.h b/trace/control.h
index ce40bd0405..23b8393b29 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -13,8 +13,11 @@
 #include "event-internal.h"
 
 typedef struct TraceEventIter {
+    /* iter state */
     size_t event;
     size_t group;
+    /* filter conditions */
+    size_t group_id;
     const char *pattern;
 } TraceEventIter;
 
@@ -40,6 +43,16 @@ void trace_event_iter_init_all(TraceEventIter *iter);
 void trace_event_iter_init_pattern(TraceEventIter *iter, const char *pattern);
 
 /**
+ * trace_event_iter_init_group:
+ * @iter: the event iterator struct
+ * @group_id: group_id to filter events by group.
+ *
+ * Initialize the event iterator struct @iter,
+ * using @group_id to filter for events in the group.
+ */
+void trace_event_iter_init_group(TraceEventIter *iter, size_t group_id);
+
+/**
  * trace_event_iter_next:
  * @iter: the event iterator struct
  *