第三个值是发送缓冲区空间的最大字节数（该值会被 wmem_max 覆盖）。

The third value is the maximum send buffer space (overridden by wmem_max).

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我们看到SEND (AR)，它是客户机上的发送缓冲区。

We see send (AR) which is the send buffer from the client.

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如果缓冲区已满，将阻止后来的“发送”操作。

If the buffer is full, further Send operations are blocked.

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应用程序尝试发送一个字符，但是发送缓冲区已经满了。

CE_TXFULL the application tried to transmit a character, but the output buffer was full.

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应用程序尝试发送一个字符，但是发送缓冲区已经满了。

CE_TXFULL the application tried to transmit a character, but the output buffer was full.

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