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 __u64 cg_id; 8 __u64 expected_pid; 9 10 SEC("tracepoint/syscalls/sys_enter_nanosleep") 11 int trace(void *ctx) 12 { 13 __u32 pid = bpf_get_current_pid_tgid(); 14 15 if (expected_pid == pid) 16 cg_id = bpf_get_current_cgroup_id(); 17 18 return 0; 19 } 20 21 char _license[] SEC("license") = "GPL"; 22