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| // SPDX-License-Identifier: GPL-2.0
| // Copyright (c) 2018 Facebook
|
| #include <linux/bpf.h>
| #include <bpf/bpf_helpers.h>
|
| struct {
| __uint(type, BPF_MAP_TYPE_ARRAY);
| __uint(max_entries, 1);
| __type(key, __u32);
| __type(value, __u64);
| } cg_ids SEC(".maps");
|
| struct {
| __uint(type, BPF_MAP_TYPE_ARRAY);
| __uint(max_entries, 1);
| __type(key, __u32);
| __type(value, __u32);
| } pidmap SEC(".maps");
|
| SEC("tracepoint/syscalls/sys_enter_nanosleep")
| int trace(void *ctx)
| {
| __u32 pid = bpf_get_current_pid_tgid();
| __u32 key = 0, *expected_pid;
| __u64 *val;
|
| expected_pid = bpf_map_lookup_elem(&pidmap, &key);
| if (!expected_pid || *expected_pid != pid)
| return 0;
|
| val = bpf_map_lookup_elem(&cg_ids, &key);
| if (val)
| *val = bpf_get_current_cgroup_id();
|
| return 0;
| }
|
| char _license[] SEC("license") = "GPL";
| __u32 _version SEC("version") = 1; /* ignored by tracepoints, required by libbpf.a */
|
|
