1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
3
4 #include "vmlinux.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7
8 char _license[] SEC("license") = "GPL";
9
10 struct {
11 __uint(type, BPF_MAP_TYPE_HASH);
12 __uint(max_entries, 1);
13 __type(key, int);
14 __type(value, long);
15 } hash1 SEC(".maps");
16
17 struct {
18 __uint(type, BPF_MAP_TYPE_HASH);
19 __uint(max_entries, 1);
20 __type(key, int);
21 __type(value, long);
22 } hash2 SEC(".maps");
23
24 int pass1 = 0;
25 int pass2 = 0;
26
27 SEC("fentry/htab_map_delete_elem")
28 int BPF_PROG(on_delete, struct bpf_map *map)
29 {
30 int key = 0;
31
32 if (map == (void *)&hash1) {
33 pass1++;
34 return 0;
35 }
36 if (map == (void *)&hash2) {
37 pass2++;
38 bpf_map_delete_elem(&hash2, &key);
39 return 0;
40 }
41
42 return 0;
43 }
44
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