The switch case for PRU_DETACH calls tcp_disconnect to check if a connection state is ESTABLISHED.
PRU_DETACH的切换实例调用tcp _ disconnect，以检查连接状态是否为ESTABLISHED。
The switch case for PRU_DETACH calls tcp_disconnect to check if a connection state is ESTABLISHED.
PRU_DETACH的切换实例调用tcp _ disconnect，以检查连接状态是否为ESTABLISHED。
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