The switch in the tcp_usrreq function calls in_setpeeraddr(), which copies the foreign IP address and foreign port number from the protocol control block and returns these to the server process.
tcp_usrreq函数中的切换调用 in_setpeeraddr()，后者从协议控制块复制外来IP地址和外来端口号，并将其返回到服务器进程。
CAN-BUS interface adopts protocol control chip SJA1000 plus receiving and sending chip 82c250. Ethernet interface adopts Ethernet controller RTL8019AS as physical transmission media.
CAN总线接口采用协议控制芯片SJA1000，配以收发器82c250。以太网接口采用以太网控制器rtl 8019as作为物理层传输媒介。
CAN-BUS interface adopts protocol control chip SJA1000 plus receiving and sending chip 82c250. Ethernet interface adopts Ethernet controller RTL8019AS as physical transmission media.
CAN总线接口采用协议控制芯片SJA1000，配以收发器82c250。以太网接口采用以太网控制器rtl 8019as作为物理层传输媒介。
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