struct_ops_detach.c

 1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
 3#include <vmlinux.h>
 4#include <bpf/bpf_helpers.h>
 5#include "../test_kmods/bpf_testmod.h"
 6
 7char _license[] SEC("license") = "GPL";
 8
 9/*
10 * This subprogram validates that libbpf handles the situation in which BPF
11 * object has subprograms in .text section, but has no entry BPF programs.
12 * At some point that was causing issues due to legacy logic of treating such
13 * subprogram as entry program (with unknown program type, which would fail).
14 */
15int dangling_subprog(void)
16{
17	/* do nothing, just be here */
18	return 0;
19}
20
21SEC(".struct_ops.link")
22struct bpf_testmod_ops testmod_do_detach;