+int sd_bus_message_append_array(sd_bus_message *m, char type, const void *ptr, size_t size);
+int sd_bus_message_append_array_ptr(sd_bus_message *m, char type, size_t size, void **ptr);
+
+int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, size_t *size);
+