IOCTL
h->error.errtype = IOCTL;
case IOCTL:
case IOCTL:
case IOCTL:
case IOCTL:
case IOCTL:
case IOCTL:
if (ioctl(fd, IOCTL, (caddr_t)&b) >= 0 && chars(b) > 0)
if (ioctl(fd, IOCTL, (caddr_t)&b) >= 0) {