sa_in            1856 net/if.c       	struct sockaddr_in	 sa_in;
sa_in            1873 net/if.c       	bzero(&sa_in, sizeof(sa_in));
sa_in            1874 net/if.c       	sa_in.sin_len = sizeof(sa_in);
sa_in            1875 net/if.c       	sa_in.sin_family = AF_INET;
sa_in            1876 net/if.c       	if ((rn = rt_lookup(sintosa(&sa_in), sintosa(&sa_in), 0)) != NULL) {