A GClosure.
A GValue to store the return value. May be NULL if the callback of closure doesn't return a value.
An array of GValues holding the arguments on which to invoke the callback of closure.
The invocation hint given as the last argument to g_closure_invoke().
Additional data specified when registering the marshaller, see g_closure_set_marshal() and g_closure_set_meta_marshal()
A generic marshaller function implemented via libffi. Since 2.30