Function libffi_sys::ffi_prep_raw_closure

pub unsafe extern fn ffi_prep_raw_closure(arg1: *mut ffi_raw_closure,
                                          cif: *mut ffi_cif,
                                          fun: Option<unsafe extern fn(_: *mut ffi_cif, _: *mut c_void, _: *mut ffi_raw, _: *mut c_void)>,
                                          user_data: *mut c_void)
                                          -> ffi_status