bpf_obj_get
err = bpf_obj_get(&attr);
fd = bpf_obj_get(file);
fd = bpf_obj_get(file);
map_fd = bpf_obj_get(map_filename);
array_fd = bpf_obj_get(pinned_file);
LIBBPF_API int bpf_obj_get(const char *pathname);
fd = bpf_obj_get(path);
pin_fd = bpf_obj_get(map->pin_path);
fd = bpf_obj_get(path);
map_fd = bpf_obj_get(path);
map_fd = bpf_obj_get(path);
map_fd2 = bpf_obj_get(abs_path);
server_map = bpf_obj_get(SERVER_MAP_PATH);
map_fds[i] = bpf_obj_get(map_paths[i]);