探测器又叫做缓冲区探测器—它只在实际的数据块上被调用，比如视频帧。

The probe is what's called a buffer probe-it gets called only on actual blocks of data such as frames of video.

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当ship缓冲区为空时，SHIP逻辑将另一个' Fetch '请求发送到“ US ”服务器，以便获取下一块数据。

When the SHIP buffer is empty, the SHIP logic sends another 'Fetch' request to the "US" server to get the next block of data.

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copy _ from_user函数将数据块从用户空间复制到内核缓冲区。

The copy_from_user function copies a block of data from user space into a kernel buffer.

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