Nettetint echo_rqt(int sockfd, int pin) {pid_t pid = getpid(); // PDU定义：PIN LEN Data: int len_h = 0, len_n = 0; // len_h: native order, len_n: network order: int pin_h = pin, pin_n = htonl(pin); char fn_td[10] = { 0 }; char buf[MAX_CMD_STR + 1 + 8] = { 0 }; //定义应用 … NettetDESCRIPTION. getsockopt () and setsockopt () manipulate options for the socket referred to by the file descriptor sockfd. Options may exist at multiple protocol levels; they are always present at the uppermost socket level. When manipulating socket options, the level at which the option resides and the name of the option must be specified.

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