Function gio_sys::g_buffered_input_stream_fill_async

pub unsafe extern "C" fn g_buffered_input_stream_fill_async(
    stream: *mut GBufferedInputStream, 
    count: ssize_t, 
    io_priority: c_int, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)