bpf_link_get_next_id
err = bpf_link_get_next_id(id, &id);
err = bpf_link_get_next_id(id, &id);
LIBBPF_API int bpf_link_get_next_id(__u32 start_id, __u32 *next_id);
while (!bpf_link_get_next_id(next_id, &next_id)) {
ASSERT_EQ(bpf_link_get_next_id(link_info.id, &next), -EPERM,
ASSERT_EQ(bpf_link_get_next_id(0, &next), -EPERM, "link_get_next_id_fails");