SoW-2019-0002: Dynamic Snapshot

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

diff --git a/include/lttng/trigger/trigger.h b/include/lttng/trigger/trigger.h
index feffc6a8f9fb0f1c05c8b1f19b9cb1f308988a7e..823a026518ecfc7d42a7462415576a3190667df9 100644 (file)
--- a/include/lttng/trigger/trigger.h
+++ b/include/lttng/trigger/trigger.h
@@ -11,6 +11,8 @@
 struct lttng_action;
 struct lttng_condition;
 struct lttng_trigger;
+/* A collection of trigger */
+struct lttng_triggers;
 
 #ifdef __cplusplus
 extern "C" {
@@ -21,6 +23,20 @@ enum lttng_register_trigger_status {
        LTTNG_REGISTER_TRIGGER_STATUS_INVALID = -1,
 };
 
+enum lttng_trigger_status {
+       LTTNG_TRIGGER_STATUS_OK = 0,
+       LTTNG_TRIGGER_STATUS_ERROR = -1,
+       LTTNG_TRIGGER_STATUS_UNKNOWN = -2,
+       LTTNG_TRIGGER_STATUS_INVALID = -3,
+       LTTNG_TRIGGER_STATUS_UNSET = -4,
+       LTTNG_TRIGGER_STATUS_UNSUPPORTED = -5,
+};
+
+enum lttng_trigger_firing_policy_type {
+       LTTNG_TRIGGER_FIRE_EVERY_N = 0,
+       LTTNG_TRIGGER_FIRE_ONCE_AFTER_N = 1,
+};
+
 /*
  * Create a trigger object associating a condition and an action.
  *
@@ -52,6 +68,9 @@ extern struct lttng_trigger *lttng_trigger_create(
 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.
  *
@@ -62,6 +81,58 @@ 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.
+ *
+ * The caller does not assume the ownership of the returned name.
+ * The name shall only only be used for the duration of the trigger's
+ * lifetime, or before a different name is set.
+ *
+ * Returns LTTNG_TRIGGER_STATUS_OK and a pointer to the trigger's name on
+ * success, LTTNG_TRIGGER_STATUS_INVALID if an invalid parameter is passed,
+ * or LTTNG_TRIGGER_STATUS_UNSET if a name was not set prior to this call.
+ */
+extern enum lttng_trigger_status lttng_trigger_get_name(
+               const struct lttng_trigger *trigger, const char **name);
+
+/*
+ * Set the trigger name.
+ *
+ * A name is optional.
+ * A name will be assigned on trigger registration if no name is set.
+ *
+ * The name is copied.
+ *
+ * Return LTTNG_TRIGGER_STATUS_OK on success, LTTNG_TRIGGER_STATUS_INVALID
+ * if invalid parameters are passed.
+ */
+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 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_set_firing_policy(
+               struct lttng_trigger *trigger,
+               enum lttng_trigger_firing_policy_type policy_type,
+               unsigned long long threshold);
+extern enum lttng_trigger_status lttng_trigger_get_firing_policy(
+               const struct lttng_trigger *trigger,
+               enum lttng_trigger_firing_policy_type *policy_type,
+               unsigned long long *threshold);
+
 /*
  * Destroy (frees) a trigger object.
  */
@@ -83,7 +154,44 @@ 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 current triggers.
+ * 
+ * On success, triggers is allocated.
+ * The trigger collection must be free by the caller with lttng_destroy_triggers
+ *
+ * Returns 0 on success, else a negative LTTng error code.
+ */
+extern int lttng_list_triggers(struct lttng_triggers **triggers);
+
+/*
+ * Get a trigger from the collection at a given index.
+ *
+ * Note that the collection maintains the ownership of the returned trigger.
+ * It must not be destroyed by the user, nor should it be held beyond the
+ * lifetime of the trigger collection.
+ *
+ * Returns a trigger, or NULL on error.
+ */
+extern const struct lttng_trigger *lttng_triggers_get_at_index(
+               const struct lttng_triggers *triggers, unsigned int index);
+
+/*
+ * Get the number of trigger in a tracker id list.
+ *
+ * Return LTTNG_TRIGGER_STATUS_OK on success,
+ * LTTNG_TRIGGER_STATUS_INVALID when passed invalid parameters.
+ */
+extern enum lttng_trigger_status lttng_triggers_get_count(
+               const struct lttng_triggers *triggers, unsigned int *count);
+
+/*
+ * Destroy a trigger collection.
+ */
+extern void lttng_triggers_destroy(struct lttng_triggers *ids);
+
 
 #ifdef __cplusplus
 }