When a plugin unloaded it needs to unregister its print handler from
pevent. So add unregister function to do it.
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
tools/lib/traceevent/event-parse.c | 23 +++++++++++++++++++++++
tools/lib/traceevent/event-parse.h | 2 ++
2 files changed, 25 insertions(+)
diff --git a/tools/lib/traceevent/event-parse.c
b/tools/lib/traceevent/event-parse.c
index 05ae4b4ed0c8..fe962fbb156c 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5560,6 +5560,29 @@ int pevent_register_print_function(struct pevent *pevent,
return ret;
}
+/**
+ * pevent_unregister_print_function - unregister a helper function
+ * @pevent: the handle to the pevent
+ * @func: the function to process the helper function
+ * @name: the name of the helper function
+ *
+ * This function removes existing print handler for function @name.
+ *
+ * Returns 0 if the handler was removed successully, -1 otherwise.
+ */
+int pevent_unregister_print_function(struct pevent *pevent,
+ pevent_func_handler func, char *name)
+{
+ struct pevent_function_handler *func_handle;
+
+ func_handle = find_func_handler(pevent, name);
+ if (func_handle && func_handle->func == func) {
+ remove_func_handler(pevent, name);
+ return 0;
+ }
+ return -1;
+}
+
static struct event_format *pevent_search_event(struct pevent *pevent, int id,
const char *sys_name,
const char *event_name)
diff --git a/tools/lib/traceevent/event-parse.h
b/tools/lib/traceevent/event-parse.h
index c48acfbc6230..791c539374c7 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -631,6 +631,8 @@ int pevent_register_print_function(struct pevent *pevent,
pevent_func_handler func,
enum pevent_func_arg_type ret_type,
char *name, ...);
+int pevent_unregister_print_function(struct pevent *pevent,
+ pevent_func_handler func, char *name);
struct format_field *pevent_find_common_field(struct event_format *event,
const char *name);
struct format_field *pevent_find_field(struct event_format *event, const char
*name);
--
1.7.11.7
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