50 lines · c
1// SPDX-License-Identifier: GPL-2.02/* 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 9char _license[] SEC("license") = "GPL";10 11long tasks = 0;12long seq_err = 0;13bool skip = false;14 15SEC("iter/task")16int 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#else45 skip = true;46#endif47 48 return 0;49}50