typedef GVaClosureMarshal GSignalCVaMarshaller; This is the signature of va_list marshaller functions, an optional marshaller that can be used in some situations to avoid marshalling the signal argument into GValues.
See Implementation
typedef GVaClosureMarshal GSignalCVaMarshaller; This is the signature of va_list marshaller functions, an optional marshaller that can be used in some situations to avoid marshalling the signal argument into GValues.