Function gio_sys::g_pollable_output_stream_write_nonblocking

pub unsafe extern fn g_pollable_output_stream_write_nonblocking(stream: *mut GPollableOutputStream,
                                                                buffer: *mut u8,
                                                                count: size_t,
                                                                cancellable: *mut GCancellable,
                                                                error: *mut *mut GError)
                                                                -> ssize_t