websocketclient.py 文件源码

def tty_size(self, fd):
        """Get the tty size

        Return a tuple (rows,cols) representing the size of the TTY `fd`.

        The provided file descriptor should be the stdout stream of the TTY.

        If the TTY size cannot be determined, returns None.
        """

        if not os.isatty(fd.fileno()):
            return None

        try:
            dims = struct.unpack('hh', fcntl.ioctl(fd,
                                                   termios.TIOCGWINSZ,
                                                   'hhhh'))
        except Exception:
            try:
                dims = (os.environ['LINES'], os.environ['COLUMNS'])
            except Exception:
                return None

        return dims