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tools lib traceevent: Add pevent_unregister_print_function()

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When a plugin unloaded it needs to unregister its print handler from
pevent.

So add an unregister function to do it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1389839478-5887-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2014-01-16 11:31:08 +09:00 committed by Arnaldo Carvalho de Melo
parent ad13701d49
commit 20c7e5abbd
2 changed files with 25 additions and 0 deletions
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23
tools/lib/traceevent/event-parse.c
View file

@ -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)

2
tools/lib/traceevent/event-parse.h
View file

@ -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);