Type Definition gpgme_sys::gpgme_register_io_cb_t

type gpgme_register_io_cb_t = Option<extern "C" fn(_: *mut c_void, _: c_int, _: c_int, _: gpgme_io_cb_t, _: *mut c_void, _: *mut *mut c_void) -> gpgme_error_t>;