| // +build linux |
| |
| /* |
| Copyright 2015 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package procfs |
| |
| import ( |
| "bytes" |
| "fmt" |
| "io" |
| "io/ioutil" |
| "os" |
| "path" |
| "path/filepath" |
| "regexp" |
| "strconv" |
| "strings" |
| "syscall" |
| "unicode" |
| |
| utilerrors "k8s.io/apimachinery/pkg/util/errors" |
| "k8s.io/klog" |
| ) |
| |
| type ProcFS struct{} |
| |
| func NewProcFS() ProcFSInterface { |
| return &ProcFS{} |
| } |
| |
| func containerNameFromProcCgroup(content string) (string, error) { |
| lines := strings.Split(content, "\n") |
| for _, line := range lines { |
| entries := strings.SplitN(line, ":", 3) |
| if len(entries) == 3 && entries[1] == "devices" { |
| return strings.TrimSpace(entries[2]), nil |
| } |
| } |
| return "", fmt.Errorf("could not find devices cgroup location") |
| } |
| |
| // getFullContainerName gets the container name given the root process id of the container. |
| // E.g. if the devices cgroup for the container is stored in /sys/fs/cgroup/devices/docker/nginx, |
| // return docker/nginx. Assumes that the process is part of exactly one cgroup hierarchy. |
| func (pfs *ProcFS) GetFullContainerName(pid int) (string, error) { |
| filePath := path.Join("/proc", strconv.Itoa(pid), "cgroup") |
| content, err := ioutil.ReadFile(filePath) |
| if err != nil { |
| if os.IsNotExist(err) { |
| return "", os.ErrNotExist |
| } |
| return "", err |
| } |
| return containerNameFromProcCgroup(string(content)) |
| } |
| |
| // Find process(es) using a regular expression and send a specified |
| // signal to each process |
| func PKill(name string, sig syscall.Signal) error { |
| if len(name) == 0 { |
| return fmt.Errorf("name should not be empty") |
| } |
| re, err := regexp.Compile(name) |
| if err != nil { |
| return err |
| } |
| pids := getPids(re) |
| if len(pids) == 0 { |
| return fmt.Errorf("unable to fetch pids for process name : %q", name) |
| } |
| errList := []error{} |
| for _, pid := range pids { |
| if err = syscall.Kill(pid, sig); err != nil { |
| errList = append(errList, err) |
| } |
| } |
| return utilerrors.NewAggregate(errList) |
| } |
| |
| // Find process(es) with a specified name (regexp match) |
| // and return their pid(s) |
| func PidOf(name string) ([]int, error) { |
| if len(name) == 0 { |
| return []int{}, fmt.Errorf("name should not be empty") |
| } |
| re, err := regexp.Compile("(^|/)" + name + "$") |
| if err != nil { |
| return []int{}, err |
| } |
| return getPids(re), nil |
| } |
| |
| func getPids(re *regexp.Regexp) []int { |
| pids := []int{} |
| |
| dirFD, err := os.Open("/proc") |
| if err != nil { |
| return nil |
| } |
| defer dirFD.Close() |
| |
| for { |
| // Read a small number at a time in case there are many entries, we don't want to |
| // allocate a lot here. |
| ls, err := dirFD.Readdir(10) |
| if err == io.EOF { |
| break |
| } |
| if err != nil { |
| return nil |
| } |
| |
| for _, entry := range ls { |
| if !entry.IsDir() { |
| continue |
| } |
| |
| // If the directory is not a number (i.e. not a PID), skip it |
| pid, err := strconv.Atoi(entry.Name()) |
| if err != nil { |
| continue |
| } |
| |
| cmdline, err := ioutil.ReadFile(filepath.Join("/proc", entry.Name(), "cmdline")) |
| if err != nil { |
| klog.V(4).Infof("Error reading file %s: %+v", filepath.Join("/proc", entry.Name(), "cmdline"), err) |
| continue |
| } |
| |
| // The bytes we read have '\0' as a separator for the command line |
| parts := bytes.SplitN(cmdline, []byte{0}, 2) |
| if len(parts) == 0 { |
| continue |
| } |
| // Split the command line itself we are interested in just the first part |
| exe := strings.FieldsFunc(string(parts[0]), func(c rune) bool { |
| return unicode.IsSpace(c) || c == ':' |
| }) |
| if len(exe) == 0 { |
| continue |
| } |
| // Check if the name of the executable is what we are looking for |
| if re.MatchString(exe[0]) { |
| // Grab the PID from the directory path |
| pids = append(pids, pid) |
| } |
| } |
| } |
| |
| return pids |
| } |