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Linux/samples/bpf/trace_output_kern.c

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  1 #include <linux/ptrace.h>
  2 #include <linux/version.h>
  3 #include <uapi/linux/bpf.h>
  4 #include "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;
 31 

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