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.
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.
吨知道的数据，我们要在描述符的大小。
T know the size of the data that we want to have in the descriptor .
吨知道的数据，我们要在描述符的大小。
T know the size of the data that we want to have in the descriptor .
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