There is no API for clearing filter from event. After adding an API that
applys a filter we must provide an identical API for clearing the filter.
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@xxxxxxxxx>
---
Documentation/libtracefs-filter.txt | 8 +++++++-
include/tracefs.h | 3 ++-
src/tracefs-filter.c | 14 ++++++++++++++
3 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/Documentation/libtracefs-filter.txt b/Documentation/libtracefs-filter.txt
index 7db3d60..f7bbb17 100644
--- a/Documentation/libtracefs-filter.txt
+++ b/Documentation/libtracefs-filter.txt
@@ -3,7 +3,7 @@ libtracefs(3)
NAME
----
-tracefs_filter_string_append, tracefs_filter_string_verify, tracefs_event_apply_filter -
+tracefs_filter_string_append, tracefs_filter_string_verify, tracefs_event_filter_apply tracefs_event_filter_clear -
Add, verify and apply event filters
SYNOPSIS
@@ -17,6 +17,8 @@ int tracefs_filter_string_append(struct tep_event pass:[*]event, char pass:[**]
enum tracefs_synth_compare compare, const char pass:[*]val);
int tracefs_filter_string_verify(struct tep_event pass:[*]event, const char pass:[*]filter, char pass:[**]err);
int tracefs_event_filter_apply(struct tracefs_instance pass:[*]instance, struct tep_event pass:[*]event, const char pass:[*]filter);
+int tracefs_event_filter_clear(struct tracefs_instance pass:[*]instance, struct tep_event pass:[*]event);
+
--
DESCRIPTION
@@ -69,6 +71,8 @@ with *free*().
*tracefs_event_filter_apply*() applies given _filter_ string on _event_ in given _instance_.
+*tracefs_event_filter_clear*() clear all filters on _event_ in given _instance_.
+
RETURN VALUE
------------
*tracefs_filter_string_append*() returns 0 on success and -1 on error.
@@ -80,6 +84,8 @@ freed with *free*().
*tracefs_event_filter_apply*() returns 0 on success and -1 on error.
+*tracefs_event_filter_clear*() returns 0 on success and -1 on error.
+
EXAMPLE
-------
[source,c]
diff --git a/include/tracefs.h b/include/tracefs.h
index ac92dca..3ac3d9c 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -479,6 +479,8 @@ int tracefs_filter_string_verify(struct tep_event *event, const char *filter,
int tracefs_event_filter_apply(struct tracefs_instance *instance,
struct tep_event *event, const char *filter);
+int tracefs_event_filter_clear(struct tracefs_instance *instance,
+ struct tep_event *event);
/** Deprecated do not use: Instead use tracefs_filter_string_append() **/
int tracefs_event_append_filter(struct tep_event *event, char **filter,
@@ -490,7 +492,6 @@ int tracefs_event_append_filter(struct tep_event *event, char **filter,
int tracefs_event_verify_filter(struct tep_event *event, const char *filter,
char **err);
-
#define TRACEFS_TIMESTAMP "common_timestamp"
#define TRACEFS_TIMESTAMP_USECS "common_timestamp.usecs"
diff --git a/src/tracefs-filter.c b/src/tracefs-filter.c
index 7bc36fe..85d0be1 100644
--- a/src/tracefs-filter.c
+++ b/src/tracefs-filter.c
@@ -764,6 +764,20 @@ int tracefs_event_filter_apply(struct tracefs_instance *instance,
"filter", filter);
}
+/**
+ * tracefs_event_filter_clear - clear the filter on event in given instance
+ * @instance: The instance in which the filter will be applied (NULL for toplevel).
+ * @event: The event to apply the filter on.
+ *
+ * Returns 0 on succes and -1 on error.
+ */
+int tracefs_event_filter_clear(struct tracefs_instance *instance,
+ struct tep_event *event)
+{
+ return tracefs_event_file_write(instance, event->system, event->name,
+ "filter", "0");
+}
+
/** Deprecated **/
int tracefs_event_append_filter(struct tep_event *event, char **filter,
enum tracefs_filter type,
--
2.32.0
|