trigger: introduce firing policies
[lttng-tools.git] / include / lttng / trigger / trigger.h
index b8e6080d9519a7edaaab43ca291c7c45f56e685d..a0c312ddd1e92e2efdb94c6affcbb942696198ff 100644 (file)
@@ -9,6 +9,7 @@
 #define LTTNG_TRIGGER_H
 
 #include <sys/types.h>
+#include <inttypes.h>
 
 struct lttng_action;
 struct lttng_condition;
@@ -35,6 +36,11 @@ enum lttng_trigger_status {
        LTTNG_TRIGGER_STATUS_PERMISSION_DENIED = -6,
 };
 
+enum lttng_trigger_firing_policy {
+       LTTNG_TRIGGER_FIRING_POLICY_EVERY_N = 0,
+       LTTNG_TRIGGER_FIRING_POLICY_ONCE_AFTER_N = 1,
+};
+
 /*
  * Create a trigger object associating a condition and an action.
  *
@@ -127,6 +133,37 @@ extern enum lttng_trigger_status lttng_trigger_get_name(
 extern enum lttng_trigger_status lttng_trigger_set_name(
                struct lttng_trigger *trigger, const char *name);
 
+/*
+ * Set the trigger firing policy.
+ *
+ * This is optional. By default a trigger is set to fire each time the
+ * associated condition occurs.
+ *
+ * Threshold is the number of times the condition must be hit before the policy
+ * is enacted.
+ *
+ * Return LTTNG_TRIGGER_STATUS_OK on success, LTTNG_TRIGGER_STATUS_INVALID
+ * if invalid parameters are passed.
+ */
+extern enum lttng_trigger_status lttng_trigger_set_firing_policy(
+               struct lttng_trigger *trigger,
+               enum lttng_trigger_firing_policy policy_type,
+               uint64_t threshold);
+
+/*
+ * Get the trigger firing policy.
+ *
+ * Threshold is the number of time the condition must be hit before the policy is
+ * enacted.
+ *
+ * Return LTTNG_TRIGGER_STATUS_OK on success, LTTNG_TRIGGER_STATUS_INVALID
+ * if invalid parameters are passed.
+ */
+extern enum lttng_trigger_status lttng_trigger_get_firing_policy(
+               const struct lttng_trigger *trigger,
+               enum lttng_trigger_firing_policy *policy_type,
+               uint64_t *threshold);
+
 /*
  * Destroy (frees) a trigger object.
  */
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