/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright (c) 2020 Facebook */ /* "undefine" structs in vmlinux.h, because we "override" them below */ #define bpf_iter_meta bpf_iter_meta___not_used #define bpf_iter__task bpf_iter__task___not_used #include "vmlinux.h" #undef bpf_iter_meta #undef bpf_iter__task #include <bpf/bpf_helpers.h> char _license[] SEC("license") = "GPL"; int count = 0; struct bpf_iter_meta { struct seq_file *seq; __u64 session_id; __u64 seq_num; } __attribute__((preserve_access_index)); struct bpf_iter__task { struct bpf_iter_meta *meta; struct task_struct *task; } __attribute__((preserve_access_index)); SEC("iter/task") int dump_task(struct bpf_iter__task *ctx) { struct seq_file *seq = ctx->meta->seq; char c; if (count < 4) { c = START_CHAR + count; bpf_seq_write(seq, &c, sizeof(c)); count++; } return 0; }