Universal Function Pointer

Hey- I''m trying to create a plugin system that has no requirements on the return types or parameters. I was wondering if there was any way to have one definition of a function pointer that will be able to point to any function or if there is any other way to create the desired effect. I''ve tried using linked lists of void pointer data, but programming that becomes a mess, so if anybody knows a better way I''d love to hear it. Thanks..