// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2022 Google */ #include <vmlinux.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> char _license[] SEC("license") = "GPL"; int terminate_early = 0; u64 terminal_cgroup = 0; static inline u64 cgroup_id(struct cgroup *cgrp) { return cgrp->kn->id; } SEC("iter/cgroup") int cgroup_id_printer(struct bpf_iter__cgroup *ctx) { struct seq_file *seq = ctx->meta->seq; struct cgroup *cgrp = ctx->cgroup; /* epilogue */ if (cgrp == NULL) { BPF_SEQ_PRINTF(seq, "epilogue\n"); return 0; } /* prologue */ if (ctx->meta->seq_num == 0) BPF_SEQ_PRINTF(seq, "prologue\n"); BPF_SEQ_PRINTF(seq, "%8llu\n", cgroup_id(cgrp)); if (terminal_cgroup == cgroup_id(cgrp)) return 1; return terminate_early ? 1 : 0; }