trigger: implement listing of registered trigger

[lttng-tools.git] / src / bin / lttng-sessiond / notification-thread-commands.h

diff --git a/src/bin/lttng-sessiond/notification-thread-commands.h b/src/bin/lttng-sessiond/notification-thread-commands.h
index a90d1ac2b2f662697fd54412596cba2e06689b9d..3f883bf20fbda7129eedac4d16516a8c3c2f8d2b 100644 (file)
--- a/src/bin/lttng-sessiond/notification-thread-commands.h
+++ b/src/bin/lttng-sessiond/notification-thread-commands.h
@@ -15,6 +15,7 @@
 #include "notification-thread-internal.h"
 #include "notification-thread-events.h"
 #include <common/waiter.h>
+#include <stdbool.h>
 
 struct notification_thread_data;
 struct lttng_trigger;
@@ -26,7 +27,9 @@ enum notification_thread_command_type {
        NOTIFICATION_COMMAND_TYPE_REMOVE_CHANNEL,
        NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_ONGOING,
        NOTIFICATION_COMMAND_TYPE_SESSION_ROTATION_COMPLETED,
+       NOTIFICATION_COMMAND_TYPE_LIST_TRIGGERS,
        NOTIFICATION_COMMAND_TYPE_QUIT,
+       NOTIFICATION_COMMAND_TYPE_CLIENT_COMMUNICATION_UPDATE,
 };
 
 struct notification_thread_command {
@@ -62,11 +65,28 @@ struct notification_thread_command {
                        uint64_t trace_archive_chunk_id;
                        struct lttng_trace_archive_location *location;
                } session_rotation;
+               /* List triggers. */
+               struct {
+                       /* Credentials of the requesting user. */
+                       uid_t uid;
+               } list_triggers;
+               /* Client communication update. */
+               struct {
+                       notification_client_id id;
+                       enum client_transmission_status status;
+               } client_communication_update;
+
        } parameters;
 
+       union {
+               struct {
+                       struct lttng_triggers *triggers;
+               } list_triggers;
+       } reply;
        /* lttng_waiter on which to wait for command reply (optional). */
        struct lttng_waiter reply_waiter;
        enum lttng_error_code reply_code;
+       bool is_async;
 };
 
 enum lttng_error_code notification_thread_command_register_trigger(
@@ -99,6 +119,24 @@ enum lttng_error_code notification_thread_command_session_rotation_completed(
                uint64_t trace_archive_chunk_id,
                struct lttng_trace_archive_location *location);
 
+/*
+ * Return the set of triggers visible to a given client.
+ *
+ * The trigger objects contained in the set are the actual trigger instances
+ * used by the notification subsystem (i.e. not a copy). Given that the command
+ * is only used to serialize the triggers, this is fine: the properties that
+ * are serialized are immutable over the lifetime of the triggers.
+ *
+ * Moreover, the lifetime of the trigger instances is protected through
+ * reference counting (references are held by the trigger set).
+ *
+ * The caller has the exclusive ownership of the returned trigger set.
+ */
+enum lttng_error_code notification_thread_command_list_triggers(
+               struct notification_thread_handle *handle,
+               uid_t client_uid,
+               struct lttng_triggers **triggers);
+
 void notification_thread_command_quit(
                struct notification_thread_handle *handle);