pids.go (2116B)
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 17 package cgroup1 18 19 import ( 20 "os" 21 "path/filepath" 22 "strconv" 23 "strings" 24 25 v1 "github.com/containerd/cgroups/v3/cgroup1/stats" 26 specs "github.com/opencontainers/runtime-spec/specs-go" 27 ) 28 29 func NewPids(root string) *pidsController { 30 return &pidsController{ 31 root: filepath.Join(root, string(Pids)), 32 } 33 } 34 35 type pidsController struct { 36 root string 37 } 38 39 func (p *pidsController) Name() Name { 40 return Pids 41 } 42 43 func (p *pidsController) Path(path string) string { 44 return filepath.Join(p.root, path) 45 } 46 47 func (p *pidsController) Create(path string, resources *specs.LinuxResources) error { 48 if err := os.MkdirAll(p.Path(path), defaultDirPerm); err != nil { 49 return err 50 } 51 if resources.Pids != nil && resources.Pids.Limit > 0 { 52 return os.WriteFile( 53 filepath.Join(p.Path(path), "pids.max"), 54 []byte(strconv.FormatInt(resources.Pids.Limit, 10)), 55 defaultFilePerm, 56 ) 57 } 58 return nil 59 } 60 61 func (p *pidsController) Update(path string, resources *specs.LinuxResources) error { 62 return p.Create(path, resources) 63 } 64 65 func (p *pidsController) Stat(path string, stats *v1.Metrics) error { 66 current, err := readUint(filepath.Join(p.Path(path), "pids.current")) 67 if err != nil { 68 return err 69 } 70 var max uint64 71 maxData, err := os.ReadFile(filepath.Join(p.Path(path), "pids.max")) 72 if err != nil { 73 return err 74 } 75 if maxS := strings.TrimSpace(string(maxData)); maxS != "max" { 76 if max, err = parseUint(maxS, 10, 64); err != nil { 77 return err 78 } 79 } 80 stats.Pids = &v1.PidsStat{ 81 Current: current, 82 Limit: max, 83 } 84 return nil 85 }