termio.py 文件源码

def resize(self, rows, cols, em_dimensions=None, ctrl_l=True):
        """
        Resizes the child process's terminal window to *rows* and *cols* by
        first sending it a TIOCSWINSZ event and then sending ctrl-l.

        If *em_dimensions* are provided they will be updated along with the
        rows and cols.

        The sending of ctrl-l can be disabled by setting *ctrl_l* to False.
        """
        logging.debug(
            "Resizing term %s to rows: %s, cols: %s, em_dimensions=%s"
            % (self.term_id, rows, cols, em_dimensions))
        if rows < 2:
            rows = 24
        if cols < 2:
            cols = 80
        self.rows = rows
        self.cols = cols
        self.term.resize(rows, cols, em_dimensions)
        # Sometimes the resize doesn't actually apply (for whatever reason)
        # so to get around this we have to send a different value than the
        # actual value we want then send our actual value.  It's a bug outside
        # of Gate One that I have no idea how to isolate but this has proven to
        # be an effective workaround.
        import fcntl, termios
        s = struct.pack("HHHH", rows, cols, 0, 0)
        try:
            fcntl.ioctl(self.fd, termios.TIOCSWINSZ, s)
        except IOError:
            # Process already ended--no big deal
            return
        try:
            os.kill(self.pid, signal.SIGWINCH) # Send the resize signal
        except OSError:
            return # Process is dead.  Can happen when things go quickly
        if ctrl_l:
            self.write(u'\x0c') # ctrl-l