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6e0ca9e46c
Now supports cgroupsv2. Fixes: #4192 Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
// Copyright 2019 psgo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cgroups
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import (
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"sync"
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"syscall"
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)
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const (
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CgroupRoot = "/sys/fs/cgroup"
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cgroup2SuperMagic = 0x63677270
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)
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var (
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isUnifiedOnce sync.Once
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isUnified bool
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isUnifiedErr error
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)
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// IsCgroup2UnifiedMode returns whether we are running in cgroup or cgroupv2 mode.
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func IsCgroup2UnifiedMode() (bool, error) {
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isUnifiedOnce.Do(func() {
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var st syscall.Statfs_t
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if err := syscall.Statfs(CgroupRoot, &st); err != nil {
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isUnified, isUnifiedErr = false, err
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} else {
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isUnified, isUnifiedErr = st.Type == cgroup2SuperMagic, nil
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}
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})
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return isUnified, isUnifiedErr
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}
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