// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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struct bpf_map_def SEC("maps") cg_ids = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(__u32),
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.value_size = sizeof(__u64),
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.max_entries = 1,
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};
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struct bpf_map_def SEC("maps") pidmap = {
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.type = BPF_MAP_TYPE_ARRAY,
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.key_size = sizeof(__u32),
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.value_size = sizeof(__u32),
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.max_entries = 1,
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};
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SEC("tracepoint/syscalls/sys_enter_nanosleep")
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int trace(void *ctx)
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{
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__u32 pid = bpf_get_current_pid_tgid();
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__u32 key = 0, *expected_pid;
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__u64 *val;
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expected_pid = bpf_map_lookup_elem(&pidmap, &key);
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if (!expected_pid || *expected_pid != pid)
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return 0;
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val = bpf_map_lookup_elem(&cg_ids, &key);
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if (val)
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*val = bpf_get_current_cgroup_id();
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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__u32 _version SEC("version") = 1; /* ignored by tracepoints, required by libbpf.a */
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