fprintf(stderr, _("%s: unknown interface: %s\n"),
fprintf(stderr, _("%s: ERROR while getting interface flags: %s\n"),
static int clr_flag(char *ifname, short flag){    struct ifreq ifr;    int fd;    if (strchr(ifname, ':')) {        /* This is a v4 alias interface.  Downing it via a socket for	   another AF may have bad consequences. */        fd = get_socket_for_af(AF_INET);	if (fd < 0) {	    fprintf(stderr, _("No support for INET on this system.\n"));	    return -1;	}    } else        fd = skfd;    safe_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);    if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {	fprintf(stderr, _("%s: unknown interface: %s\n"), 		ifname, strerror(errno));	return -1;    }    safe_strncpy(ifr.ifr_name, ifname, IFNAMSIZ);    ifr.ifr_flags &= ~flag;    if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {	perror("SIOCSIFFLAGS");	return -1;    }    return (0);}