samples/bpf/trace_output_kern.c

   1 #include <linux/ptrace.h>
   2 #include <linux/version.h>
   3 #include <uapi/linux/bpf.h>
   4 #include <bpf/bpf_helpers.h>
   5
   6 struct 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
  13 SEC("kprobe/sys_write")
  14 int 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
  29 char _license[] SEC("license") = "GPL";
  30 u32 _version SEC("version") = LINUX_VERSION_CODE;