def tty_signal_keys(self, intr=None, quit=None, start=None,
stop=None, susp=None, fileno=None):
"""
Read and/or set the tty's signal character settings.
This function returns the current settings as a tuple.
Use the string 'undefined' to unmap keys from their signals.
The value None is used when no change is being made.
Setting signal keys is done using the integer ascii
code for the key, eg. 3 for CTRL+C.
If this function is called after start() has been called
then the original settings will be restored when stop()
is called.
"""
if fileno is None:
fileno = sys.stdin.fileno()
if not os.isatty(fileno):
return
tattr = termios.tcgetattr(fileno)
sattr = tattr[6]
skeys = (sattr[termios.VINTR], sattr[termios.VQUIT],
sattr[termios.VSTART], sattr[termios.VSTOP],
sattr[termios.VSUSP])
if intr == 'undefined': intr = 0
if quit == 'undefined': quit = 0
if start == 'undefined': start = 0
if stop == 'undefined': stop = 0
if susp == 'undefined': susp = 0
if intr is not None: tattr[6][termios.VINTR] = intr
if quit is not None: tattr[6][termios.VQUIT] = quit
if start is not None: tattr[6][termios.VSTART] = start
if stop is not None: tattr[6][termios.VSTOP] = stop
if susp is not None: tattr[6][termios.VSUSP] = susp
if intr is not None or quit is not None or \
start is not None or stop is not None or \
susp is not None:
termios.tcsetattr(fileno, termios.TCSADRAIN, tattr)
self._signal_keys_set = True
return skeys
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