TUNSIFHEAD
#if defined(TUNSIFHEAD) && !defined(SSH_TUN_PREPEND_AF)
#if defined(TUNSIFHEAD) && !defined(SSH_TUN_PREPEND_AF)
ioctl(fd, TUNSIFHEAD, &flag) == -1) {
case TUNSIFHEAD:
#if defined(TUNSIFMODE) || defined(TUNSLMODE) || defined(TUNSIFHEAD)
#ifdef TUNSIFHEAD
if (ID0ioctl(bundle.dev.fd, TUNSIFHEAD, &iff) < 0) {