sessiond: add support for anonymous triggers

[lttng-tools.git] / include / lttng / trigger / trigger.h

diff --git a/include/lttng/trigger/trigger.h b/include/lttng/trigger/trigger.h
index a0c312ddd1e92e2efdb94c6affcbb942696198ff..6490af118a4333eb857d203d46dfce05a78455aa 100644 (file)
--- a/include/lttng/trigger/trigger.h
+++ b/include/lttng/trigger/trigger.h
@@ -36,11 +36,6 @@ 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.
  *
@@ -49,8 +44,14 @@ enum lttng_trigger_firing_policy {
  * in the emission of a notification to clients listening through
  * notification channels.
  *
- * The caller retains the ownership of both the condition and action
- * and both must be kept alive for the lifetime of the trigger object.
+ * Prior to 2.13, the caller had to retain the ownership of both the condition
+ * and action. Both objects had to be kept alive for the lifetime of the trigger
+ * object. This is no longer the case as the condition and action objects are
+ * internally reference counted. It is safe to destroy a condition and an action
+ * after using them to create a trigger. However, they should no longer be used.
+ *
+ * If the action is a notification action with capture descriptors,
+ * the condition must be an event rule condition.
  *
  * A trigger must be registered in order to become activate and can
  * be destroyed after its registration.
@@ -94,6 +95,9 @@ extern enum lttng_trigger_status lttng_trigger_get_owner_uid(
 extern struct lttng_condition *lttng_trigger_get_condition(
                struct lttng_trigger *trigger);
 
+const struct lttng_condition *lttng_trigger_get_const_condition(
+               const struct lttng_trigger *trigger);
+
 /*
  * Get the action of a trigger.
  *
@@ -104,6 +108,8 @@ extern struct lttng_condition *lttng_trigger_get_condition(
 extern struct lttng_action *lttng_trigger_get_action(
                struct lttng_trigger *trigger);
 
+const struct lttng_action *lttng_trigger_get_const_action(
+               const struct lttng_trigger *trigger);
 
 /*
  * Get the name of a trigger.
@@ -133,37 +139,6 @@ 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.
  */
@@ -185,7 +160,20 @@ extern int lttng_register_trigger(struct lttng_trigger *trigger);
  *
  * Return 0 on success, a negative LTTng error code on error.
  */
-extern int lttng_unregister_trigger(struct lttng_trigger *trigger);
+extern int lttng_unregister_trigger(const struct lttng_trigger *trigger);
+
+/*
+ * List triggers for the current user.
+ *
+ * On success, a newly-allocated trigger set is returned.
+ *
+ * The trigger set must be destroyed by the caller (see
+ * lttng_triggers_destroy()).
+ *
+ * Returns LTTNG_OK on success, else a suitable LTTng error code.
+ */
+extern enum lttng_error_code lttng_list_triggers(
+               struct lttng_triggers **triggers);
 
 /*
  * Get a trigger from the set at a given index.