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 cgroups 18 19import ( 20 "io/ioutil" 21 "os" 22 "path/filepath" 23 "strconv" 24 "strings" 25 26 v1 "github.com/containerd/cgroups/stats/v1" 27 specs "github.com/opencontainers/runtime-spec/specs-go" 28) 29 30func NewPids(root string) *pidsController { 31 return &pidsController{ 32 root: filepath.Join(root, string(Pids)), 33 } 34} 35 36type pidsController struct { 37 root string 38} 39 40func (p *pidsController) Name() Name { 41 return Pids 42} 43 44func (p *pidsController) Path(path string) string { 45 return filepath.Join(p.root, path) 46} 47 48func (p *pidsController) Create(path string, resources *specs.LinuxResources) error { 49 if err := os.MkdirAll(p.Path(path), defaultDirPerm); err != nil { 50 return err 51 } 52 if resources.Pids != nil && resources.Pids.Limit > 0 { 53 return ioutil.WriteFile( 54 filepath.Join(p.Path(path), "pids.max"), 55 []byte(strconv.FormatInt(resources.Pids.Limit, 10)), 56 defaultFilePerm, 57 ) 58 } 59 return nil 60} 61 62func (p *pidsController) Update(path string, resources *specs.LinuxResources) error { 63 return p.Create(path, resources) 64} 65 66func (p *pidsController) Stat(path string, stats *v1.Metrics) error { 67 current, err := readUint(filepath.Join(p.Path(path), "pids.current")) 68 if err != nil { 69 return err 70 } 71 var max uint64 72 maxData, err := ioutil.ReadFile(filepath.Join(p.Path(path), "pids.max")) 73 if err != nil { 74 return err 75 } 76 if maxS := strings.TrimSpace(string(maxData)); maxS != "max" { 77 if max, err = parseUint(maxS, 10, 64); err != nil { 78 return err 79 } 80 } 81 stats.Pids = &v1.PidsStat{ 82 Current: current, 83 Limit: max, 84 } 85 return nil 86} 87