A pointer to a null-terminated array of pointers to #GDBusAnnotationInfo structures or null if there are no annotations.
A pointer to a null-terminated array of pointers to #GDBusArgInfo structures or null if there are no arguments.
The name of the D-Bus signal, e.g. "NameOwnerChanged".
The reference count or -1 if statically allocated.
Information about a signal on a D-Bus interface.