我正在编写一个shell，但是当用户点击即control-C或control-Z时，我想要使用存根信号处理程序。我的代码如下;正如我已经调查过的那样，我可以让它不停在控件-Z上，但仍然挂在控件-Z上。
最新发布的代码版本位于http://JonathansCorner.com/cjsh/download.cgi。我正在处理的代码是：
def handle_signal(signal_number, frame):
print ('''
CJSH does not support the traditional and rather archaic methods of job
control. This arises partly from implementation concerns and partly for reasons
practical concerns.
In ye olden dayes with the green glow of terminals, it was important to have a
sophisticated job handling in place so jobs could be stopped, suspended, put in
the foreground, and so on and so forth, and for that matter this feature is
still used despite the fact that it was essentially a consolation prize for not
having multiple windows.
Don't try to suspend, resume, background, foreground, etc.
There is a more excellent way.
Now we have not the consolation prize but the real thing: unless you're on a
netbook or smaller, you can open another window for another job. If you have no
more use for a job, close the window.
Just open another window, or maybe a tab.
''')
signal.signal(signal.SIGTSTP, handle_signl)
signal.signal(signal.SIGHUP, handle_signal)
signal.signal(signal.SIGINT, handle_signal)
signal.signal(signal.SIGQUIT, handle_signal)
signal.signal(signal.SIGABRT, handle_signal)
signal.signal(signal.SIGALRM, handle_signal)
signal.signal(signal.SIGTERM, handle_signal)
#signal.siginterrupt(signal.SIGTSTP, False)
#signal.siginterrupt(signal.SIGHUP, False)
#signal.siginterrupt(signal.SIGINT, False)
#signal.siginterrupt(signal.SIGQUIT, False)
#signal.siginterrupt(signal.SIGABRT, False)
#signal.siginterrupt(signal.SIGALRM, False)
#signal.siginterrupt(signal.SIGTERM, False)
这里需要改变什么以及如何更改它以便调用handle_signal（）然后事情继续滴答作响？