1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (c) 2018 Facebook |
3 | |
4 | #include <linux/bpf.h> |
5 | #include <bpf/bpf_helpers.h> |
6 | |
7 | struct { |
8 | __uint(type, BPF_MAP_TYPE_ARRAY); |
9 | __uint(max_entries, 1); |
10 | __type(key, __u32); |
11 | __type(value, __u64); |
12 | } cg_ids SEC(".maps" ); |
13 | |
14 | struct { |
15 | __uint(type, BPF_MAP_TYPE_ARRAY); |
16 | __uint(max_entries, 1); |
17 | __type(key, __u32); |
18 | __type(value, __u32); |
19 | } pidmap SEC(".maps" ); |
20 | |
21 | SEC("tracepoint/syscalls/sys_enter_nanosleep" ) |
22 | int trace(void *ctx) |
23 | { |
24 | __u32 pid = bpf_get_current_pid_tgid(); |
25 | __u32 key = 0, *expected_pid; |
26 | __u64 *val; |
27 | |
28 | expected_pid = bpf_map_lookup_elem(&pidmap, &key); |
29 | if (!expected_pid || *expected_pid != pid) |
30 | return 0; |
31 | |
32 | val = bpf_map_lookup_elem(&cg_ids, &key); |
33 | if (val) |
34 | *val = bpf_get_current_cgroup_id(); |
35 | |
36 | return 0; |
37 | } |
38 | |
39 | char _license[] SEC("license" ) = "GPL" ; |
40 | |