__init__.py 文件源码

def setwinsize(self, rows, cols):

        '''This sets the terminal window size of the child tty. This will cause
        a SIGWINCH signal to be sent to the child. This does not change the
        physical window size. It changes the size reported to TTY-aware
        applications like vi or curses -- applications that respond to the
        SIGWINCH signal. '''

        # Some very old platforms have a bug that causes the value for
        # termios.TIOCSWINSZ to be truncated. There was a hack here to work
        # around this, but it caused problems with newer platforms so has been
        # removed. For details see https://github.com/pexpect/pexpect/issues/39
        TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561)
        # Note, assume ws_xpixel and ws_ypixel are zero.
        s = struct.pack('HHHH', rows, cols, 0, 0)
        fcntl.ioctl(self.fileno(), TIOCSWINSZ, s)