44 строки
1.1 KiB
C
44 строки
1.1 KiB
C
/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/ptrace.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <linux/version.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <uapi/linux/utsname.h>
|
|
|
|
struct bpf_map_def SEC("maps") cgroup_map = {
|
|
.type = BPF_MAP_TYPE_CGROUP_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(u32),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") perf_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(u64),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
/* Writes the last PID that called sync to a map at index 0 */
|
|
SEC("kprobe/sys_sync")
|
|
int bpf_prog1(struct pt_regs *ctx)
|
|
{
|
|
u64 pid = bpf_get_current_pid_tgid();
|
|
int idx = 0;
|
|
|
|
if (!bpf_current_task_under_cgroup(&cgroup_map, 0))
|
|
return 0;
|
|
|
|
bpf_map_update_elem(&perf_map, &idx, &pid, BPF_ANY);
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|