samples/bpf/trace_output.bpf.c

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