host_llseek
ssize_t host_llseek(int fd, int32_t offset_high, int32_t offset_lo, uint64_t *result, int whence);
if (host_llseek(desc->d_unit, posh, posl, &res, 0) < 0)
err = host_llseek(hf->hf_fd, offh, offl, &res, whence);