You can use the bind API function to bind an address (an interface and a port) to a socket endpoint.

您可以使用bind api函数来绑定一个地址(一个接口和一个端口)到一个套接字端点。

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As mentioned in Bindings, dependencies, and constraints, this is one of the ways to bind user-supplied data to the instance. An example of the tag from our address form is shown in Listing 12.

正如在绑定、相关性和约束中提到的那样，这是将用户提供的数据绑定至实例的方法之一。

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The bind call copies the local address specified by the process into an mbuf and calls sobind, which in turn calls tcp_usrreq with PRU_BIND as the request.

bind调用将进程指定的本地地址复制到mbuf，并调用sobind，后者则根据请求使用PRU_BIND调用tcp_usrreq 。

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