Function writePidFile

pkg/ocihook/ocihook.go:772–792

writePidFile writes the pid atomically to a file. From https://github.com/containerd/containerd/blob/v1.7.0-rc.2/cmd/ctr/commands/commands.go#L265-L282

(path string, pid int)

// writePidFile writes the pid atomically to a file.
// From https://github.com/containerd/containerd/blob/v1.7.0-rc.2/cmd/ctr/commands/commands.go#L265-L282
func writePidFile(path string, pid int) error {
	path, err := filepath.Abs(path)
	if err != nil {
		return err
	}
	dir := filepath.Dir(path)
	if err := os.MkdirAll(dir, 0755); err != nil {
		return err
	}
	tempPath := filepath.Join(dir, fmt.Sprintf(".%s", filepath.Base(path)))
	f, err := os.OpenFile(tempPath, os.O_RDWR|os.O_CREATE|os.O_EXCL|os.O_SYNC, 0666)
	if err != nil {
		return err
	}
	_, err = fmt.Fprint(f, pid)
	f.Close()
	if err != nil {
		return err
	}
	return os.Rename(tempPath, path)
}

func killProcessByPidFile(pidFile string) error {
	pidData, err := os.ReadFile(pidFile)