1/* 2 Copyright The containerd Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15*/ 16 17package v2 18 19import ( 20 "io/ioutil" 21 "path/filepath" 22 "strings" 23) 24 25// State is a type that represents the state of the current cgroup 26type State string 27 28const ( 29 Unknown State = "" 30 Thawed State = "thawed" 31 Frozen State = "frozen" 32 Deleted State = "deleted" 33 34 cgroupFreeze = "cgroup.freeze" 35) 36 37func (s State) Values() []Value { 38 v := Value{ 39 filename: cgroupFreeze, 40 } 41 switch s { 42 case Frozen: 43 v.value = "1" 44 case Thawed: 45 v.value = "0" 46 } 47 return []Value{ 48 v, 49 } 50} 51 52func fetchState(path string) (State, error) { 53 current, err := ioutil.ReadFile(filepath.Join(path, cgroupFreeze)) 54 if err != nil { 55 return Unknown, err 56 } 57 switch strings.TrimSpace(string(current)) { 58 case "1": 59 return Frozen, nil 60 case "0": 61 return Thawed, nil 62 default: 63 return Unknown, nil 64 } 65} 66