compare_map_keys
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
int compare_map_keys(int map1_fd, int map2_fd);