}
int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock,
- struct notification_thread_handle *notification_thread)
+ struct notification_thread_handle *notification_thread,
+ struct lttng_trigger **return_trigger)
{
int ret;
size_t trigger_len;
}
}
-
/*
* Validate the trigger credentials against the command credentials.
* Only the root user can register a trigger with non-matching
}
}
- /* Inform the notification thread */
+ /*
+ * A reference to the trigger is acquired by the notification thread.
+ * It is safe to return the same trigger to the caller since it the
+ * other user holds a reference.
+ *
+ * The trigger is modified during the execution of the
+ * "register trigger" command. However, by the time the command returns,
+ * it is safe to use without any locking as its properties are
+ * immutable.
+ */
ret = notification_thread_command_register_trigger(notification_thread,
trigger);
+ if (ret != LTTNG_OK) {
+ goto end_notification_thread;
+ }
+
+ /* Return an updated trigger to the client. */
+ *return_trigger = trigger;
+
+end_notification_thread:
/* Ownership of trigger was transferred. */
trigger = NULL;
end: