pub unsafe extern "C" fn CPXgetnetcallbackfunc( env: CPXCENVptr, callback_p: *mut Option<unsafe extern "C" fn(arg1: CPXCENVptr, arg2: *mut c_void, arg3: c_int, arg4: *mut c_void) -> c_int>, cbhandle_p: *mut *mut c_void, ) -> c_int