// 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";