func (d *driver) Terminate(p *execdriver.Command) error {
	// lets check the start time for the process
	state, err := libcontainer.GetState(filepath.Join(d.root, p.ID))
	if err != nil {
		if !os.IsNotExist(err) {
			return err
		}
		// TODO: Remove this part for version 1.2.0
		// This is added only to ensure smooth upgrades from pre 1.1.0 to 1.1.0
		data, err := ioutil.ReadFile(filepath.Join(d.root, p.ID, "start"))
		if err != nil {
			// if we don't have the data on disk then we can assume the process is gone
			// because this is only removed after we know the process has stopped
			if os.IsNotExist(err) {
				return nil
			}
			return err
		}
		state = &libcontainer.State{InitStartTime: string(data)}
	}

	currentStartTime, err := system.GetProcessStartTime(p.ProcessConfig.Process.Pid)
	if err != nil {
		return err
	}

	if state.InitStartTime == currentStartTime {
		err = syscall.Kill(p.ProcessConfig.Process.Pid, 9)
		syscall.Wait4(p.ProcessConfig.Process.Pid, nil, 0, nil)
	}
	d.removeContainerRoot(p.ID)

	return err

}

func (d *driver) Terminate(c *execdriver.Command) error {
	defer d.cleanContainer(c.ID)
	// lets check the start time for the process
	active := d.activeContainers[c.ID]
	if active == nil {
		return fmt.Errorf("active container for %s does not exist", c.ID)
	}
	state, err := active.State()
	if err != nil {
		return err
	}
	pid := state.InitProcessPid

	currentStartTime, err := system.GetProcessStartTime(pid)
	if err != nil {
		return err
	}

	if state.InitProcessStartTime == currentStartTime {
		err = syscall.Kill(pid, 9)
		syscall.Wait4(pid, nil, 0, nil)
	}

	return err

}

func newRestoredProcess(pid int, fds []string) (*restoredProcess, error) {
	var (
		err error
	)
	proc, err := os.FindProcess(pid)
	if err != nil {
		return nil, err
	}
	started, err := system.GetProcessStartTime(pid)
	if err != nil {
		return nil, err
	}
	return &restoredProcess{
		proc:             proc,
		processStartTime: started,
		fds:              fds,
	}, nil
}

func (d *driver) Terminate(c *execdriver.Command) error {
	defer d.cleanContainer(c.ID)
	container, err := d.factory.Load(c.ID)
	if err != nil {
		return err
	}
	defer container.Destroy()
	state, err := container.State()
	if err != nil {
		return err
	}
	pid := state.InitProcessPid
	currentStartTime, err := system.GetProcessStartTime(pid)
	if err != nil {
		return err
	}
	if state.InitProcessStartTime == currentStartTime {
		err = syscall.Kill(pid, 9)
		syscall.Wait4(pid, nil, 0, nil)
	}
	return err
}

func (p *setnsProcess) startTime() (string, error) {
	return system.GetProcessStartTime(p.pid())
}

// TODO(vishh): This is part of the libcontainer API and it does much more than just namespaces related work.
// Move this to libcontainer package.
// Exec performs setup outside of a namespace so that a container can be
// executed.  Exec is a high level function for working with container namespaces.
func Exec(container *libcontainer.Config, stdin io.Reader, stdout, stderr io.Writer, console string, rootfs, dataPath string, args []string, createCommand CreateCommand, startCallback func()) (int, error) {
	var (
		err error
	)

	// create a pipe so that we can syncronize with the namespaced process and
	// pass the veth name to the child
	syncPipe, err := syncpipe.NewSyncPipe()
	if err != nil {
		return -1, err
	}
	defer syncPipe.Close()

	command := createCommand(container, console, rootfs, dataPath, os.Args[0], syncPipe.Child(), args)
	// Note: these are only used in non-tty mode
	// if there is a tty for the container it will be opened within the namespace and the
	// fds will be duped to stdin, stdiout, and stderr
	command.Stdin = stdin
	command.Stdout = stdout
	command.Stderr = stderr

	if err := command.Start(); err != nil {
		return -1, err
	}

	// Now we passed the pipe to the child, close our side
	syncPipe.CloseChild()

	started, err := system.GetProcessStartTime(command.Process.Pid)
	if err != nil {
		return -1, err
	}

	// Do this before syncing with child so that no children
	// can escape the cgroup
	cgroupRef, err := SetupCgroups(container, command.Process.Pid)
	if err != nil {
		command.Process.Kill()
		command.Wait()
		return -1, err
	}
	defer cgroupRef.Cleanup()

	cgroupPaths, err := cgroupRef.Paths()
	if err != nil {
		command.Process.Kill()
		command.Wait()
		return -1, err
	}

	var networkState network.NetworkState
	if err := InitializeNetworking(container, command.Process.Pid, syncPipe, &networkState); err != nil {
		command.Process.Kill()
		command.Wait()
		return -1, err
	}

	state := &libcontainer.State{
		InitPid:       command.Process.Pid,
		InitStartTime: started,
		NetworkState:  networkState,
		CgroupPaths:   cgroupPaths,
	}

	if err := libcontainer.SaveState(dataPath, state); err != nil {
		command.Process.Kill()
		command.Wait()
		return -1, err
	}
	defer libcontainer.DeleteState(dataPath)

	// Sync with child
	if err := syncPipe.ReadFromChild(); err != nil {
		command.Process.Kill()
		command.Wait()
		return -1, err
	}

	if startCallback != nil {
		startCallback()
	}

	if err := command.Wait(); err != nil {
		if _, ok := err.(*exec.ExitError); !ok {
			return -1, err
		}
	}

	return command.ProcessState.Sys().(syscall.WaitStatus).ExitStatus(), nil
}

// TODO(vishh): This is part of the libcontainer API and it does much more than just namespaces related work.
// Move this to libcontainer package.
// Exec performs setup outside of a namespace so that a container can be
// executed.  Exec is a high level function for working with container namespaces.
func Exec(container *libcontainer.Config, stdin io.Reader, stdout, stderr io.Writer, console, dataPath string, args []string, createCommand CreateCommand, startCallback func()) (int, error) {
	var err error

	// create a pipe so that we can syncronize with the namespaced process and
	// pass the state and configuration to the child process
	parent, child, err := newInitPipe()
	if err != nil {
		return -1, err
	}
	defer parent.Close()

	command := createCommand(container, console, dataPath, os.Args[0], child, args)
	// Note: these are only used in non-tty mode
	// if there is a tty for the container it will be opened within the namespace and the
	// fds will be duped to stdin, stdiout, and stderr
	command.Stdin = stdin
	command.Stdout = stdout
	command.Stderr = stderr

	if err := command.Start(); err != nil {
		child.Close()
		return -1, err
	}
	child.Close()

	wait := func() (*os.ProcessState, error) {
		ps, err := command.Process.Wait()
		// we should kill all processes in cgroup when init is died if we use
		// host PID namespace
		if !container.Namespaces.Contains(libcontainer.NEWPID) {
			killAllPids(container)
		}
		return ps, err
	}

	terminate := func(terr error) (int, error) {
		// TODO: log the errors for kill and wait
		command.Process.Kill()
		wait()
		return -1, terr
	}

	started, err := system.GetProcessStartTime(command.Process.Pid)
	if err != nil {
		return terminate(err)
	}

	// Do this before syncing with child so that no children
	// can escape the cgroup
	cgroupPaths, err := SetupCgroups(container, command.Process.Pid)
	if err != nil {
		return terminate(err)
	}
	defer cgroups.RemovePaths(cgroupPaths)

	var networkState network.NetworkState
	if err := InitializeNetworking(container, command.Process.Pid, &networkState); err != nil {
		return terminate(err)
	}
	// send the state to the container's init process then shutdown writes for the parent
	if err := json.NewEncoder(parent).Encode(networkState); err != nil {
		return terminate(err)
	}
	// shutdown writes for the parent side of the pipe
	if err := syscall.Shutdown(int(parent.Fd()), syscall.SHUT_WR); err != nil {
		return terminate(err)
	}

	state := &libcontainer.State{
		InitPid:       command.Process.Pid,
		InitStartTime: started,
		NetworkState:  networkState,
		CgroupPaths:   cgroupPaths,
	}

	if err := libcontainer.SaveState(dataPath, state); err != nil {
		return terminate(err)
	}
	defer libcontainer.DeleteState(dataPath)

	// wait for the child process to fully complete and receive an error message
	// if one was encoutered
	var ierr *initError
	if err := json.NewDecoder(parent).Decode(&ierr); err != nil && err != io.EOF {
		return terminate(err)
	}
	if ierr != nil {
		return terminate(ierr)
	}

	if startCallback != nil {
		startCallback()
	}

	ps, err := wait()
	if err != nil {
//.........这里部分代码省略.........