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

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2017 Facebook
   3
   4 #include <linux/bpf.h>
   5 #include <bpf/bpf_helpers.h>
   6
   7 /* taken from /sys/kernel/debug/tracing/events/sched/sched_switch/format */
   8 struct sched_switch_args {
   9         unsigned long long pad;
  10         char prev_comm[16];
  11         int prev_pid;
  12         int prev_prio;
  13         long long prev_state;
  14         char next_comm[16];
  15         int next_pid;
  16         int next_prio;
  17 };
  18
  19 SEC("tracepoint/sched/sched_switch")
  20 int oncpu(struct sched_switch_args *ctx)
  21 {
  22         return 0;
  23 }
  24
  25 char _license[] SEC("license") = "GPL";
  26 __u32 _version SEC("version") = 1; /* ignored by tracepoints, required by libbpf.a */