trace_output_kern.c 660 B

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