bpf_map_get_next_id
err = bpf_map_get_next_id(id, &id);
err = bpf_map_get_next_id(id, &id);
err = bpf_map_get_next_id(id, &id);
err = bpf_map_get_next_id(id, &id);
LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id);
while (!bpf_map_get_next_id(next_id, &next_id)) {
if (bpf_map_get_next_id(id, &id) || id > data_map_id)
ASSERT_EQ(bpf_map_get_next_id(map_info.id, &next), -EPERM,
ASSERT_EQ(bpf_map_get_next_id(0, &next), -EPERM, "map_get_next_id_fails");
err = bpf_map_get_next_id(id, &id);