tcp_usrreq函数中的切换实例检查套接字与本地端口的绑定。

The switch case in the tcp_usrreq function checks for the binding of a local port with the socket.

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在tcp_usrreq函数的切换语句中，PRU_LISTEN的实例检查套接字是否绑定到端口。

Within the switch statement of the tcp_usrreq function, the case for PRU_LISTEN checks if the socket is bound to the port.

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之后，元数据功能可以检查注释实例的注释类型。

The metadata facility can then check annotation instances against the annotation types.

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