mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-06-23 14:59:50 +08:00
107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
// Copyright 2019 Yunion
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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 utils
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import (
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"fmt"
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"io/ioutil"
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"os"
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"strconv"
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"strings"
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"syscall"
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"yunion.io/x/pkg/errors"
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)
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const errPidNotRunning = errors.Error("pid not running")
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type PidFile struct {
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Path string
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Comm string
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}
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func NewPidFile(path, comm string) *PidFile {
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pf := &PidFile{
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Path: path,
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Comm: comm,
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}
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return pf
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}
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func (pf *PidFile) findProcess() (*os.Process, error) {
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data, err := ioutil.ReadFile(pf.Path)
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if err != nil {
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return nil, err
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}
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s := strings.TrimSpace(string(data))
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pid, err := strconv.Atoi(s)
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if err != nil {
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return nil, err
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}
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proc, err := os.FindProcess(pid)
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if err != nil {
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return nil, errPidNotRunning
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}
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if err := proc.Signal(syscall.Signal(0)); err != nil {
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return nil, errPidNotRunning
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}
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return proc, nil
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}
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func (pf *PidFile) findComm(pid int) (string, error) {
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fp := fmt.Sprintf("/proc/%d/comm", pid)
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data, err := ioutil.ReadFile(fp)
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if err != nil {
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return "", err
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}
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comm := strings.TrimSpace(string(data))
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return comm, nil
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}
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// ConfirmedOrUnlink reads the pidfile, confirm that it's running and comm
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// matches pf.Comm
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//
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// When confirmed is true, proc must be non-nil
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func (pf *PidFile) ConfirmOrUnlink() (proc *os.Process, confirmed bool, err error) {
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proc, err = pf.findProcess()
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if err != nil {
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if err == errPidNotRunning {
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os.Remove(pf.Path)
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}
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err = errors.Wrapf(err, "pidfile %s: find process: %v", pf.Path, err)
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return
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}
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comm, err := pf.findComm(proc.Pid)
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if err != nil {
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err = errors.Wrapf(err, "pidfile %s: find comm: %v", pf.Path, err)
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return
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}
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if pf.Comm == comm {
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confirmed = true
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return
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}
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err = os.Remove(pf.Path)
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if err != nil {
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err = errors.Wrapf(err, "pidfile %s: unlink: %v", pf.Path, err)
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}
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return
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}
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func WritePidFile(pid int, pidFile string) error {
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data := fmt.Sprintf("%d\n", pid)
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err := ioutil.WriteFile(pidFile, []byte(data), FileModeFile)
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return err
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}
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