tools/testing/selftests/bpf/progs/trace_printk.c

   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
   8 char _license[] SEC("license") = "GPL";
   9
  10 int trace_printk_ret = 0;
  11 int trace_printk_ran = 0;
  12
  13 SEC("tp/raw_syscalls/sys_enter")
  14 int sys_enter(void *ctx)
  15 {
  16         static const char fmt[] = "testing,testing %d\n";
  17
  18         trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
  19                                             ++trace_printk_ran);
  20         return 0;
  21 }