Function libffi_sys::ffi_prep_cif

pub unsafe extern fn ffi_prep_cif(cif: *mut ffi_cif,
                                  abi: ffi_abi,
                                  nargs: c_uint,
                                  rtype: *mut ffi_type,
                                  atypes: *mut *mut ffi_type)
                                  -> ffi_status