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