// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020, Oracle and/or its affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_core_read.h>

#include <errno.h>

char _license[] SEC("license") = "GPL";

long tasks = 0;
long seq_err = 0;
bool skip = false;

SEC("iter/task")
int dump_task_struct(struct bpf_iter__task *ctx)
{
        struct seq_file *seq = ctx->meta->seq;
        struct task_struct *task = ctx->task;
        static struct btf_ptr ptr = { };
        long ret;

#if __has_builtin(__builtin_btf_type_id)
        ptr.type_id = bpf_core_type_id_kernel(struct task_struct);
        ptr.ptr = task;

        if (ctx->meta->seq_num == 0)
                BPF_SEQ_PRINTF(seq, "Raw BTF task\n");

        ret = bpf_seq_printf_btf(seq, &ptr, sizeof(ptr), 0);
        switch (ret) {
        case 0:
                tasks++;
                break;
        case -ERANGE:
                /* NULL task or task->fs, don't count it as an error. */
                break;
        case -E2BIG:
                return 1;
        default:
                seq_err = ret;
                break;
        }
#else
        skip = true;
#endif

        return 0;
}