1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2021 Facebook */
 3#include "vmlinux.h"
 4#include <bpf/bpf_helpers.h>
 5#include <bpf/bpf_tracing.h>
 6
 7char LICENSE[] SEC("license") = "GPL";
 8
 9int pid = 0;
10int fentry_cnt = 0;
11int fexit_cnt = 0;
12
13SEC("fentry/__x64_sys_nanosleep")
14int BPF_PROG(nanosleep_fentry, const struct pt_regs *regs)
15{
16	if ((int)bpf_get_current_pid_tgid() != pid)
17		return 0;
18
19	fentry_cnt++;
20	return 0;
21}
22
23SEC("fexit/__x64_sys_nanosleep")
24int BPF_PROG(nanosleep_fexit, const struct pt_regs *regs, int ret)
25{
26	if ((int)bpf_get_current_pid_tgid() != pid)
27		return 0;
28
29	fexit_cnt++;
30	return 0;
31}