tools lib traceevent: Add pevent_unregister_print_function()

[~andy/linux] / tools / lib / traceevent / event-parse.c

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index d1973cb8388bfc6857a91c064d3d79ebebbb489a..1587ea392ad6d83acb0de14b1701db12fa4fc95c 100644 (file)
--- 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)