xref: /OK3568_Linux_fs/kernel/tools/testing/selftests/bpf/progs/trace_printk.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun // Copyright (c) 2020, Oracle and/or its affiliates.
3*4882a593Smuzhiyun 
4*4882a593Smuzhiyun #include "vmlinux.h"
5*4882a593Smuzhiyun #include <bpf/bpf_helpers.h>
6*4882a593Smuzhiyun #include <bpf/bpf_tracing.h>
7*4882a593Smuzhiyun 
8*4882a593Smuzhiyun char _license[] SEC("license") = "GPL";
9*4882a593Smuzhiyun 
10*4882a593Smuzhiyun int trace_printk_ret = 0;
11*4882a593Smuzhiyun int trace_printk_ran = 0;
12*4882a593Smuzhiyun 
13*4882a593Smuzhiyun SEC("tp/raw_syscalls/sys_enter")
sys_enter(void * ctx)14*4882a593Smuzhiyun int sys_enter(void *ctx)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun 	static const char fmt[] = "testing,testing %d\n";
17*4882a593Smuzhiyun 
18*4882a593Smuzhiyun 	trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
19*4882a593Smuzhiyun 					    ++trace_printk_ran);
20*4882a593Smuzhiyun 	return 0;
21*4882a593Smuzhiyun }
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