当一个文件描述符上数据准备好时，它无法立即响应。

It cannot respond to a file descriptor immediately when the data becomes ready.

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描述符的长度将被设置为新数据长度。

The length of this descriptor is set to reflect the new data.

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描述符的长度将被设置为新数据长度。

The length of this descriptor is set to reflect the new data.

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