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