1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020, Oracle and/or its affiliates. */
3 #include "bpf_iter.h"
4 #include <bpf/bpf_helpers.h>
5 #include <bpf/bpf_core_read.h>
6
7 #include <errno.h>
8
9 char _license[] SEC("license") = "GPL";
10
11 long tasks = 0;
12 long seq_err = 0;
13 bool skip = false;
14
15 SEC("iter/task")
16 int dump_task_struct(struct bpf_iter__task *ctx)
17 {
18 struct seq_file *seq = ctx->meta->seq;
19 struct task_struct *task = ctx->task;
20 static struct btf_ptr ptr = { };
21 long ret;
22
23 #if __has_builtin(__builtin_btf_type_id)
24 ptr.type_id = bpf_core_type_id_kernel(struct task_struct);
25 ptr.ptr = task;
26
27 if (ctx->meta->seq_num == 0)
28 BPF_SEQ_PRINTF(seq, "Raw BTF task\n");
29
30 ret = bpf_seq_printf_btf(seq, &ptr, sizeof(ptr), 0);
31 switch (ret) {
32 case 0:
33 tasks++;
34 break;
35 case -ERANGE:
36 /* NULL task or task->fs, don't count it as an error. */
37 break;
38 case -E2BIG:
39 return 1;
40 default:
41 seq_err = ret;
42 break;
43 }
44 #else
45 skip = true;
46 #endif
47
48 return 0;
49 }
50
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