1// SPDX-License-Identifier: GPL-2.0
2#include <vmlinux.h>
3#include <bpf/bpf_helpers.h>
4
5struct {
6 __uint(type, BPF_MAP_TYPE_ARRAY);
7 __uint(max_entries, 1);
8 __type(key, __u32);
9 __type(value, __u64);
10} array_map SEC(".maps");
11
12static __u64
13check_array_elem(struct bpf_map *map, __u32 *key, __u64 *val,
14 void *data)
15{
16 bpf_get_current_comm(key, sizeof(*key));
17 return 0;
18}
19
20SEC("raw_tp/sys_enter")
21int test_map_key_write(const void *ctx)
22{
23 bpf_for_each_map_elem(&array_map, check_array_elem, NULL, 0);
24 return 0;
25}
26
27char _license[] SEC("license") = "GPL";
28

source code of linux/tools/testing/selftests/bpf/progs/for_each_map_elem_write_key.c