tools/testing/selftests/bpf/progs/bpf_iter_task.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020 Facebook */
   3 #include "bpf_iter.h"
   4 #include <bpf/bpf_helpers.h>
   5 #include <bpf/bpf_tracing.h>
   6
   7 char _license[] SEC("license") = "GPL";
   8
   9 SEC("iter/task")
  10 int dump_task(struct bpf_iter__task *ctx)
  11 {
  12         struct seq_file *seq = ctx->meta->seq;
  13         struct task_struct *task = ctx->task;
  14         static char info[] = "    === END ===";
  15
  16         if (task == (void *)0) {
  17                 BPF_SEQ_PRINTF(seq, "%s\n", info);
  18                 return 0;
  19         }
  20
  21         if (ctx->meta->seq_num == 0)
  22                 BPF_SEQ_PRINTF(seq, "    tgid      gid\n");
  23
  24         BPF_SEQ_PRINTF(seq, "%8d %8d\n", task->tgid, task->pid);
  25         return 0;
  26 }