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