Guo Yongzhi

https://docs.julialang.org/en/v1/base/io-network/#Base.redirect_stdio I think you can redirect the stderr and stdout to devnull. Such as ```julia wc = redirect_stdio(stdout=devnull, stderr=devnull) do wordcloud("get only the word cloud output") |> generate! end ```

Can we set them as read-only by default (or warn on write) and provide a `writable!` function? Or when the `index` overflows, just providing a better error message to tell...

暂时没有。我是在KOA2上调试的，原理是监听了个事件：`lipc-wait-event com.lab126.hal powerButtonPressed`。这个在老版设备和固件上貌似没有。现在没有找到等价的事件或命令。