#define LTTNG_TRIGGER_H
#include <sys/types.h>
+#include <lttng/constant.h>
#include <inttypes.h>
+#include <lttng/lttng-error.h>
struct lttng_action;
struct lttng_condition;
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.
*
* 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.
extern struct lttng_condition *lttng_trigger_get_condition(
struct lttng_trigger *trigger);
+extern const struct lttng_condition *lttng_trigger_get_const_condition(
+ const struct lttng_trigger *trigger);
+
/*
* Get the action of a trigger.
*
extern struct lttng_action *lttng_trigger_get_action(
struct lttng_trigger *trigger);
+extern const struct lttng_action *lttng_trigger_get_const_action(
+ const struct lttng_trigger *trigger);
/*
* Get the name of a trigger.
*
* 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.
+ * or LTTNG_TRIGGER_STATUS_UNSET if the trigger is unnamed.
*/
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.
+ * Destroy (frees) a trigger object.
*/
-extern enum lttng_trigger_status lttng_trigger_set_name(
- struct lttng_trigger *trigger, const char *name);
+extern void lttng_trigger_destroy(struct lttng_trigger *trigger);
/*
- * Set the trigger firing policy.
+ * Register a trigger to the session daemon with a given name.
*
- * This is optional. By default a trigger is set to fire each time the
- * associated condition occurs.
+ * The trigger object can be destroyed after this call.
+ * On success, this function will set the trigger's name to `name`.
*
- * 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.
+ * Returns an LTTng status code.
*/
-extern enum lttng_trigger_status lttng_trigger_set_firing_policy(
+extern enum lttng_error_code lttng_register_trigger_with_name(
struct lttng_trigger *trigger,
- enum lttng_trigger_firing_policy policy_type,
- uint64_t threshold);
+ const char *name);
/*
- * 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.
- */
-extern void lttng_trigger_destroy(struct lttng_trigger *trigger);
-
-/*
- * Register a trigger to the session daemon.
+ * Register a trigger to the session daemon, generating a unique name for its
+ * owner.
*
* The trigger can be destroyed after this call.
+ * On success, this function will set the trigger's name to the generated
+ * name.
*
- * Return 0 on success, a negative LTTng error code on error.
+ * Returns an LTTng status code.
*/
-extern int lttng_register_trigger(struct lttng_trigger *trigger);
+extern enum lttng_error_code lttng_register_trigger_with_automatic_name(
+ struct lttng_trigger *trigger);
/*
* Unregister a trigger from the session daemon.
*
* 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.
*/
extern void lttng_triggers_destroy(struct lttng_triggers *triggers);
+/*
+ * Deprecated: invocations should be replaced by
+ * lttng_register_trigger_with_automatic_name().
+ *
+ * Register a trigger to the session daemon.
+ *
+ * The trigger can be destroyed after this call.
+ *
+ * Return 0 on success, a negative LTTng error code on error.
+ */
+LTTNG_DEPRECATED("Use lttng_register_trigger_with_automatic_name")
+extern int lttng_register_trigger(struct lttng_trigger *trigger);
#ifdef __cplusplus
}
projects / lttng-tools.git / blobdiff