code: func newConsole(uid, gid int) (Console, error) {
  	master, err := os.OpenFile("/dev/ptmx", syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_CLOEXEC, 0)
  	if err != nil {
  		return nil, err
  	}
  	console, err := ptsname(master)
  	if err != nil {
  		return nil, err
  	}
  	if err := unlockpt(master); err != nil {
  		return nil, err
  	}
  	if err := os.Chmod(console, 0600); err != nil {
  		return nil, err
  	}
  	if err := os.Chown(console, uid, gid); err != nil {
  		return nil, err
  	}
  	return &linuxConsole{
  		slavePath: console,
  		master:    master,
  	}, nil
  }
docs: // newConsole returns an initalized console that can be used within a container by copying bytes
  // from the master side to the slave that is attached as the tty for the container's init process.