pub unsafe extern "C" fn g_pollable_output_stream_writev_nonblocking(
    stream: *mut GPollableOutputStream,
    vectors: *const GOutputVector,
    n_vectors: size_t,
    bytes_written: *mut size_t,
    cancellable: *mut GCancellable,
    error: *mut *mut GError
) -> GPollableReturn
Available on crate feature v2_60 only.