sessiond: implement EXECUTE_ERROR_QUERY command

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

diff --git a/include/lttng/trigger/trigger-internal.h b/include/lttng/trigger/trigger-internal.h
index 87368476958f08186e5f907545764bc3a6376086..5bab4c7634c9a096a0819085cd49ccef063fdd8d 100644 (file)
--- a/include/lttng/trigger/trigger-internal.h
+++ b/include/lttng/trigger/trigger-internal.h
@@ -8,13 +8,14 @@
 #ifndef LTTNG_TRIGGER_INTERNAL_H
 #define LTTNG_TRIGGER_INTERNAL_H
 
-#include <lttng/trigger/trigger.h>
 #include <common/credentials.h>
 #include <common/dynamic-array.h>
 #include <common/macros.h>
 #include <common/optional.h>
-#include <stdint.h>
+#include <lttng/lttng.h>
+#include <pthread.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <sys/types.h>
 #include <urcu/ref.h>
 
@@ -30,17 +31,31 @@ struct lttng_trigger {
        char *name;
        /* For now only the uid portion of the credentials is used. */
        struct lttng_credentials creds;
-       struct {
-               enum lttng_trigger_firing_policy type;
-               uint64_t threshold;
-               uint64_t current_count;
-       } firing_policy;
        /*
         * Internal use only.
         * The unique token passed to the tracer to identify an event-rule
         * notification.
         */
        LTTNG_OPTIONAL(uint64_t) tracer_token;
+
+       /*
+        * Is the trigger registered?
+        *
+        * This is necessary since a reference holder might be interested in the
+        * overall state of the trigger from the point of view of its owner.
+        *
+        * The main user is the action executor since we want to prevent the
+        * execution of actions related to a trigger that is unregistered.
+        *
+        * Not considered for `is_equal`.
+        */
+       bool registered;
+
+       /*
+        * The lock is used to protect against concurrent trigger execution and
+        * trigger removal.
+        */
+       pthread_mutex_t lock;
 };
 
 struct lttng_triggers {
@@ -60,10 +75,6 @@ struct lttng_trigger_comm {
        uint32_t length;
        /* Includes '\0' terminator. */
        uint32_t name_length;
-       /* Firing policy. */
-       /* Maps to enum lttng_trigger_firing_policy. */
-       uint8_t firing_policy_type;
-       uint64_t firing_policy_threshold;
        /* A null-terminated name, a condition, and an action follow. */
        char payload[];
 } LTTNG_PACKED;
@@ -84,15 +95,7 @@ int lttng_trigger_serialize(const struct lttng_trigger *trigger,
                struct lttng_payload *payload);
 
 LTTNG_HIDDEN
-const struct lttng_condition *lttng_trigger_get_const_condition(
-               const struct lttng_trigger *trigger);
-
-LTTNG_HIDDEN
-const struct lttng_action *lttng_trigger_get_const_action(
-               const struct lttng_trigger *trigger);
-
-LTTNG_HIDDEN
-bool lttng_trigger_validate(struct lttng_trigger *trigger);
+bool lttng_trigger_validate(const struct lttng_trigger *trigger);
 
 LTTNG_HIDDEN
 int lttng_trigger_assign_name(
@@ -170,18 +173,67 @@ LTTNG_HIDDEN
 void lttng_trigger_set_credentials(struct lttng_trigger *trigger,
                const struct lttng_credentials *creds);
 
+/*
+ * Return the type of any underlying domain restriction. If no particular
+ * requirement is present, returns LTTNG_DOMAIN_NONE.
+ */
+LTTNG_HIDDEN
+enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction(
+               const struct lttng_trigger *trigger);
 
 /*
- * Fire the trigger.
- * Increments the occurrence count.
+ * Generate any bytecode related to the trigger.
+ * On success LTTNG_OK. On error, returns lttng_error code.
  */
 LTTNG_HIDDEN
-void lttng_trigger_fire(struct lttng_trigger *trigger);
+enum lttng_error_code lttng_trigger_generate_bytecode(
+               struct lttng_trigger *trigger,
+               const struct lttng_credentials *creds);
+
+LTTNG_HIDDEN
+struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger);
 
 /*
- * Check if the trigger would fire.
+ * A given trigger needs a tracer notifier if
+ *  it has an event-rule condition,
+ *  AND
+ *  it has one or more sessiond-execution action.
  */
 LTTNG_HIDDEN
-bool lttng_trigger_should_fire(const struct lttng_trigger *trigger);
+bool lttng_trigger_needs_tracer_notifier(const struct lttng_trigger *trigger);
+
+LTTNG_HIDDEN
+void lttng_trigger_set_as_registered(struct lttng_trigger *trigger);
+
+LTTNG_HIDDEN
+void lttng_trigger_set_as_unregistered(struct lttng_trigger *trigger);
+
+/*
+ * The trigger must be locked before calling lttng_trigger_is_registered.
+ *
+ * The lock is necessary since a trigger can be unregistered at any time.
+ *
+ * Manipulations requiring that the trigger be registered must always acquire
+ * the trigger lock for the duration of the manipulation using
+ * `lttng_trigger_lock` and `lttng_trigger_unlock`.
+ */
+LTTNG_HIDDEN
+bool lttng_trigger_is_registered(struct lttng_trigger *trigger);
+
+LTTNG_HIDDEN
+void lttng_trigger_lock(struct lttng_trigger *trigger);
+
+LTTNG_HIDDEN
+void lttng_trigger_unlock(struct lttng_trigger *trigger);
+
+LTTNG_HIDDEN
+enum lttng_trigger_status lttng_trigger_add_error_results(
+               const struct lttng_trigger *trigger,
+               struct lttng_error_query_results *results);
+
+LTTNG_HIDDEN
+enum lttng_trigger_status lttng_trigger_add_action_error_query_results(
+               struct lttng_trigger *trigger,
+               struct lttng_error_query_results *results);
 
 #endif /* LTTNG_TRIGGER_INTERNAL_H */