A protocol-specific call, pr_usrreq, is then made, which switches to the corresponding protocol-specific request associated with the socket descriptor. The prototype of the pr_usrreq function is.
然后进行协议特定的调用pr_usrreq，进而切换到与套接字描述符关联的相应协议特定的请求。
A protocol-specific call, pr_usrreq, is then made, which switches to the corresponding protocol-specific request associated with the socket descriptor. The prototype of the pr_usrreq function is.
然后进行协议特定的调用pr_usrreq，进而切换到与套接字描述符关联的相应协议特定的请求。
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