bpf_prog_array_copy
ret = bpf_prog_array_copy(old_array, NULL, prog, 0, &new_array);
ret = bpf_prog_array_copy(old_array, prog, NULL, 0, &new_array);
int bpf_prog_array_copy(struct bpf_prog_array *old_array,
ret = bpf_prog_array_copy(old_array, NULL, prog, bpf_cookie, &new_array);
ret = bpf_prog_array_copy(old_array, event->prog, NULL, 0, &new_array);