summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/progs/htab_update.c
blob: 7481bb30b29b3f79f4f0bdea2b135a5ab4e8f7a6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2022. Huawei Technologies Co., Ltd */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

struct {
	__uint(type, BPF_MAP_TYPE_HASH);
	__uint(max_entries, 1);
	__uint(key_size, sizeof(__u32));
	__uint(value_size, sizeof(__u32));
} htab SEC(".maps");

int pid = 0;
int update_err = 0;

SEC("?fentry/lookup_elem_raw")
int lookup_elem_raw(void *ctx)
{
	__u32 key = 0, value = 1;

	if ((bpf_get_current_pid_tgid() >> 32) != pid)
		return 0;

	update_err = bpf_map_update_elem(&htab, &key, &value, 0);
	return 0;
}