docs: def slave_open(tty_name):
      """slave_open(tty_name) -> slave_fd
      Open the pty slave and acquire the controlling terminal, returning
      opened filedescriptor.
      Deprecated, use openpty() instead."""
  
      result = os.open(tty_name, os.O_RDWR)
      try:
          from fcntl import ioctl, I_PUSH
      except ImportError:
          return result
      try:
          ioctl(result, I_PUSH, "ptem")
          ioctl(result, I_PUSH, "ldterm")
      except OSError:
          pass
      return result