1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2020, Oracle and/or its affiliates.
3
4#include "vmlinux.h"
5#include <bpf/bpf_helpers.h>
6#include <bpf/bpf_tracing.h>
7#include "bpf_misc.h"
8
9char _license[] SEC("license") = "GPL";
10
11int trace_printk_ret = 0;
12int trace_printk_ran = 0;
13
14const char fmt[] = "Testing,testing %d\n";
15
16SEC("fentry/" SYS_PREFIX "sys_nanosleep")
17int sys_enter(void *ctx)
18{
19	trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
20					    ++trace_printk_ran);
21	return 0;
22}
23