Python tty 模块，ECHO 实例源码

def _enterRawMode():
    global _inRawMode, _savedMode
    if _inRawMode:
        return
    fd = sys.stdin.fileno()
    try:
        old = tty.tcgetattr(fd)
        new = old[:]
    except:
        log.msg('not a typewriter!')
    else:
        # iflage
        new[0] = new[0] | tty.IGNPAR
        new[0] = new[0] & ~(tty.ISTRIP | tty.INLCR | tty.IGNCR | tty.ICRNL |
                            tty.IXON | tty.IXANY | tty.IXOFF)
        if hasattr(tty, 'IUCLC'):
            new[0] = new[0] & ~tty.IUCLC

        # lflag
        new[3] = new[3] & ~(tty.ISIG | tty.ICANON | tty.ECHO | tty.ECHO | 
                            tty.ECHOE | tty.ECHOK | tty.ECHONL)
        if hasattr(tty, 'IEXTEN'):
            new[3] = new[3] & ~tty.IEXTEN

        #oflag
        new[1] = new[1] & ~tty.OPOST

        new[6][tty.VMIN] = 1
        new[6][tty.VTIME] = 0

        _savedMode = old
        tty.tcsetattr(fd, tty.TCSANOW, new)
        #tty.setraw(fd)
        _inRawMode = 1

def _writeHack(self, data):
        """
        Hack to send ignore messages when we aren't echoing.
        """
        if self.pty is not None:
            attr = tty.tcgetattr(self.pty.fileno())[3]
            if not attr & tty.ECHO and attr & tty.ICANON: # no echo
                self.avatar.conn.transport.sendIgnore('\x00'*(8+len(data)))
        self.oldWrite(data)

def __init__(self, infile):
        if not infile.isatty():
            raise NotTTYException()
        self.file = infile

        # prepare for getch
        self.save_attr = tty.tcgetattr(self.file)
        newattr = self.save_attr[:]
        newattr[3] &= ~tty.ECHO & ~tty.ICANON
        tty.tcsetattr(self.file, tty.TCSANOW, newattr)

def _enterRawMode():
    global _inRawMode, _savedMode
    if _inRawMode:
        return
    fd = sys.stdin.fileno()
    try:
        old = tty.tcgetattr(fd)
        new = old[:]
    except:
        log.msg('not a typewriter!')
    else:
        # iflage
        new[0] = new[0] | tty.IGNPAR
        new[0] = new[0] & ~(tty.ISTRIP | tty.INLCR | tty.IGNCR | tty.ICRNL |
                            tty.IXON | tty.IXANY | tty.IXOFF)
        if hasattr(tty, 'IUCLC'):
            new[0] = new[0] & ~tty.IUCLC

        # lflag
        new[3] = new[3] & ~(tty.ISIG | tty.ICANON | tty.ECHO | tty.ECHO | 
                            tty.ECHOE | tty.ECHOK | tty.ECHONL)
        if hasattr(tty, 'IEXTEN'):
            new[3] = new[3] & ~tty.IEXTEN

        #oflag
        new[1] = new[1] & ~tty.OPOST

        new[6][tty.VMIN] = 1
        new[6][tty.VTIME] = 0

        _savedMode = old
        tty.tcsetattr(fd, tty.TCSANOW, new)
        #tty.setraw(fd)
        _inRawMode = 1

def _writeHack(self, data):
        """
        Hack to send ignore messages when we aren't echoing.
        """
        if self.pty is not None:
            attr = tty.tcgetattr(self.pty.fileno())[3]
            if not attr & tty.ECHO and attr & tty.ICANON: # no echo
                self.avatar.conn.transport.sendIgnore('\x00'*(8+len(data)))
        self.oldWrite(data)

def _enterRawMode():
    global _inRawMode, _savedRawMode
    if _inRawMode:
        return
    fd = sys.stdin.fileno()
    try:
        old = tty.tcgetattr(fd)
        new = old[:]
    except:
        log.msg('not a typewriter!')
    else:
        # iflage
        new[0] = new[0] | tty.IGNPAR
        new[0] = new[0] & ~(tty.ISTRIP | tty.INLCR | tty.IGNCR | tty.ICRNL |
                            tty.IXON | tty.IXANY | tty.IXOFF)
        if hasattr(tty, 'IUCLC'):
            new[0] = new[0] & ~tty.IUCLC

        # lflag
        new[3] = new[3] & ~(tty.ISIG | tty.ICANON | tty.ECHO | tty.ECHO |
                            tty.ECHOE | tty.ECHOK | tty.ECHONL)
        if hasattr(tty, 'IEXTEN'):
            new[3] = new[3] & ~tty.IEXTEN

        #oflag
        new[1] = new[1] & ~tty.OPOST

        new[6][tty.VMIN] = 1
        new[6][tty.VTIME] = 0

        _savedRawMode = old
        tty.tcsetattr(fd, tty.TCSANOW, new)
        #tty.setraw(fd)
        _inRawMode = 1

def _writeHack(self, data):
        """
        Hack to send ignore messages when we aren't echoing.
        """
        if self.pty is not None:
            attr = tty.tcgetattr(self.pty.fileno())[3]
            if not attr & tty.ECHO and attr & tty.ICANON:  # No echo.
                self.avatar.conn.transport.sendIgnore('\x00'*(8+len(data)))
        self.oldWrite(data)

def open(self, command, env={}):
        """ Create subprocess using forkpty() """

        # parse command
        command_arr = shlex.split(command)
        executable = command_arr[0]
        args = command_arr

        # try to fork a new pty
        try:
            self.pid, self.fd = pty.fork()

        except:

            return False

        # child proc, replace with command after altering terminal attributes
        if self.pid == 0:

            # set requested environment variables
            for k in env.keys():
                os.environ[k] = env[k]

            # set tty attributes
            try:
                attrs = tty.tcgetattr(1)
                attrs[0] = attrs[0] ^ tty.IGNBRK
                attrs[0] = attrs[0] | tty.BRKINT | tty.IXANY | tty.IMAXBEL
                attrs[2] = attrs[2] | tty.HUPCL
                attrs[3] = attrs[3] | tty.ICANON | tty.ECHO | tty.ISIG | tty.ECHOKE
                attrs[6][tty.VMIN] = 1
                attrs[6][tty.VTIME] = 0
                tty.tcsetattr(1, tty.TCSANOW, attrs)
            except:

                pass

            # replace this process with the subprocess
            os.execvp(executable, args)

        # else master, do nothing
        else:
            pass