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#include "bpf_misc.h"
 7
 8char LICENSE[] SEC("license") = "GPL";
 9
10int pid = 0;
11int fentry_cnt = 0;
12int fexit_cnt = 0;
13
14SEC("fentry/" SYS_PREFIX "sys_nanosleep")
15int nanosleep_fentry(void *ctx)
16{
17	if (bpf_get_current_pid_tgid() >> 32 != pid)
18		return 0;
19
20	fentry_cnt++;
21	return 0;
22}
23
24SEC("fexit/" SYS_PREFIX "sys_nanosleep")
25int nanosleep_fexit(void *ctx)
26{
27	if (bpf_get_current_pid_tgid() >> 32 != pid)
28		return 0;
29
30	fexit_cnt++;
31	return 0;
32}