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// 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;
}
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