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 | 7 ++++++-
include/tracefs.h | 2 ++
src/tracefs-filter.c | 14 ++++++++++++++
3 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/Documentation/libtracefs-filter.txt b/Documentation/libtracefs-filter.txt
index 7532c96..cdb0bcf 100644
--- a/Documentation/libtracefs-filter.txt
+++ b/Documentation/libtracefs-filter.txt
@@ -3,7 +3,7 @@ libtracefs(3)
NAME
----
-tracefs_event_append_filter, tracefs_event_verify_filter tracefs_event_apply_filter -
+tracefs_event_append_filter, tracefs_event_verify_filter tracefs_event_apply_filter tracefs_event_clear_filter -
Add, verify and apply event filters
SYNOPSIS
@@ -17,6 +17,7 @@ int tracefs_event_append_filter(struct tep_event pass:[*]event, char pass:[**] f
enum tracefs_synth_compare compare, const char pass:[*]val);
int tracefs_event_verify_filter(struct tep_event pass:[*]event, const char pass:[*]filter, char pass:[**]err);
int tracefs_event_apply_filter(struct tracefs_instance pass:[*]instance, struct tep_event pass:[*]event, const char pass:[*]filter);
+int tracefs_event_clear_filter(struct tracefs_instance pass:[*]instance, struct tep_event pass:[*]event);
--
@@ -70,6 +71,8 @@ with *free*().
*tracefs_event_apply_filter*() applies given _filter_ string on _event_ in given _instance_.
+*tracefs_event_clear_filter*() clear all filters on _event_ in given _instance_.
+
RETURN VALUE
------------
*tracefs_event_append_filter*() returns 0 on success and -1 on error.
@@ -81,6 +84,8 @@ freed with *free*().
*tracefs_event_apply_filter*() returns 0 on success and -1 on error.
+*tracefs_event_clear_filter*() returns 0 on success and -1 on error.
+
EXAMPLE
-------
[source,c]
diff --git a/include/tracefs.h b/include/tracefs.h
index 8ac9694..effc3e5 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -477,6 +477,8 @@ int tracefs_event_verify_filter(struct tep_event *event, const char *filter,
char **err);
int tracefs_event_apply_filter(struct tracefs_instance *instance,
struct tep_event *event, const char *filter);
+int tracefs_event_clear_filter(struct tracefs_instance *instance,
+ struct tep_event *event);
#define TRACEFS_TIMESTAMP "common_timestamp"
diff --git a/src/tracefs-filter.c b/src/tracefs-filter.c
index 43683d0..6d8c66f 100644
--- a/src/tracefs-filter.c
+++ b/src/tracefs-filter.c
@@ -764,3 +764,17 @@ int tracefs_event_apply_filter(struct tracefs_instance *instance,
"filter", filter);
}
+/**
+ * tracefs_event_clear_filter - 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 clear the filter on.
+ *
+ * Returns 0 on succes and -1 on error.
+ */
+int tracefs_event_clear_filter(struct tracefs_instance *instance,
+ struct tep_event *event)
+{
+ return tracefs_event_file_write(instance, event->system, event->name,
+ "filter", "0");
+}
+
--
2.32.0
|