setDummyCallback

Sets a dummy callback for source. The callback will do nothing, and if the source expects a #gboolean return value, it will return true. (If the source expects any other type of return value, it will return a 0/null value; whatever [gobject.value.Value.init_] initializes a #GValue to for that type.)

If the source is not one of the standard GLib types, the closure_callback and closure_marshal fields of the #GSourceFuncs structure must have been filled in with pointers to appropriate functions.