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_tracing.h> 6 #include <bpf/bpf_core_read.h> 7 8 #include <errno.h> 9 10 char _license[] SEC("license") = "GPL"; 11 12 long tasks = 0; 13 long seq_err = 0; 14 bool skip = false; 15 16 SEC("iter/task") 17 int dump_task_struct(struct bpf_iter__task *ctx) 18 { 19 struct seq_file *seq = ctx->meta->seq; 20 struct task_struct *task = ctx->task; 21 static struct btf_ptr ptr = { }; 22 long ret; 23 24 #if __has_builtin(__builtin_btf_type_id) 25 ptr.type_id = bpf_core_type_id_kernel(struct task_struct); 26 ptr.ptr = task; 27 28 if (ctx->meta->seq_num == 0) 29 BPF_SEQ_PRINTF(seq, "Raw BTF task\n"); 30 31 ret = bpf_seq_printf_btf(seq, &ptr, sizeof(ptr), 0); 32 switch (ret) { 33 case 0: 34 tasks++; 35 break; 36 case -ERANGE: 37 /* NULL task or task->fs, don't count it as an error. */ 38 break; 39 case -E2BIG: 40 return 1; 41 default: 42 seq_err = ret; 43 break; 44 } 45 #else 46 skip = true; 47 #endif 48 49 return 0; 50 } 51