40 lines
806 B
C
40 lines
806 B
C
|
// 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";
|