63 static int send_receive_packet(int s[2], const void* pkt, int len)  in send_receive_packet()
68   ret = send(s[1], pkt, len, 0);  in send_receive_packet()
73   ret = recv(s[0], tmp, len, MSG_DONTWAIT);  in send_receive_packet()
93   int s[2], ret;  in main()  local
95   ret = socketpair(AF_UNIX, SOCK_DGRAM, 0, s);  in main()
100   ret = setsockopt(s[0], SOL_SOCKET, SO_ATTACH_FILTER,  in main()
106   ret = send_receive_packet(s, &chksz, sizeof(chksz));  in main()
112   ret = setsockopt(s[0], SOL_SOCKET, SO_ATTACH_FILTER,  in main()
118   ret = send_receive_packet(s, &chksz, sizeof(chksz));  in main()
124   ret = setsockopt(s[0], SOL_SOCKET, SO_ATTACH_FILTER,  in main()
130   ret = send_receive_packet(s, chkrem, sizeof(chkrem));  in main()