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/bpf_helpers.h>
   5#include "trace_common.h"
   6
   7struct {
   8        __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
   9        __uint(key_size, sizeof(int));
  10        __uint(value_size, sizeof(u32));
  11        __uint(max_entries, 2);
  12} my_map SEC(".maps");
  13
  14SEC("kprobe/" SYSCALL(sys_write))
  15int bpf_prog1(struct pt_regs *ctx)
  16{
  17        struct S {
  18                u64 pid;
  19                u64 cookie;
  20        } data;
  21
  22        data.pid = bpf_get_current_pid_tgid();
  23        data.cookie = 0x12345678;
  24
  25        bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
  26
  27        return 0;
  28}
  29
  30char _license[] SEC("license") = "GPL";
  31u32 _version SEC("version") = LINUX_VERSION_CODE;
  32