root/tools/testing/selftests/bpf/progs/test_obj_id.c
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
 */
#include <stddef.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

struct {
        __uint(type, BPF_MAP_TYPE_ARRAY);
        __uint(max_entries, 1);
        __type(key, __u32);
        __type(value, __u64);
} test_map_id SEC(".maps");

SEC("raw_tp/sys_enter")
int test_obj_id(void *ctx)
{
        __u32 key = 0;
        __u64 *value;

        value = bpf_map_lookup_elem(&test_map_id, &key);
        __sink(value);

        return 0;
}