LXR linux/samples/bpf/trace_output

   1#include <linux/ptrace.h>
   2#include <linux/version.h>
   3#include <uapi/linux/bpf.h>
   4#include "bpf_helpers.h"
   5
   6struct bpf_map_def SEC("maps") my_map = {
   7        .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
   8        .key_size = sizeof(int),
   9        .value_size = sizeof(u32),
  10        .max_entries = 2,
  11};
  12
  13SEC("kprobe/sys_write")
  14int bpf_prog1(struct pt_regs *ctx)
  15{
  16        struct S {
  17                u64 pid;
  18                u64 cookie;
  19        } data;
  20
  21        data.pid = bpf_get_current_pid_tgid();
  22        data.cookie = 0x12345678;
  23
  24        bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
  25
  26        return 0;
  27}
  28
  29char _license[] SEC("license") = "GPL";
  30u32 _version SEC("version") = LINUX_VERSION_CODE;
  31