static int nvidia_fd(uint64_t *res)
{
  struct dirent **list;
  int fd, resfd, ret;
  char buf[256];
  ret = scandir("/sys/bus/pci/drivers/nvidia", &list, dirfilter, versionsort);
  if (ret <= 0)
    goto fail;
  sprintf(buf, "/sys/bus/pci/drivers/nvidia/%s/resource", list[0]->d_name);
  resfd = open(buf, O_RDONLY);
  if (resfd < 0)
    goto fail;
  read(resfd, buf, sizeof(buf));
  *res = strtoll(buf, NULL, 16);
  close(resfd);

  if ((fd = open("/dev/nvidia0", O_RDWR)) < 0)
    goto fail;
  return fd;

  fail:
    perror("COULD NOT DO SUPER SECRET HACKING STUFF, YOU ARE ON YOUR OWN!");
    *res = 0;
    return -1;
}