ifconfig
ifconfig(argc, argv, 1, NULL);
ifconfig(argc, argv, 0, afp);
ifconfig(argc, argv, 0, afp);
static int ifconfig(int argc, char *const *argv, int iscreate,
static int ifconfig(int argc, char *argv[], int af, struct afswtch *rafp);
ifconfig(argc,argv,af,rafp);
ifconfig();
static void ifconfig(void);
ifconfig();
if (ifconfig(*argv)) {
rv = ifconfig(ifname);
static int ifconfig(char *ifname);