[Chicago] Py3k Signal Handling

Brian Curtin brian at python.org
Sat Nov 10 22:22:32 CET 2012

On Sat, Nov 10, 2012 at 10:08 AM, Jonathan Hayward <
jonathan.hayward at pobox.com> wrote:

> I am working on writing a shell, but I want to have stubbed signal
> handlers when the user hits i.e. control-C or control-Z. My code is as
> follows; as I have investigated it, I can get it to not stop on a
> control-Z, but still suspend on a control-Z.
> The most recent published version of the code is at
> http://JonathansCorner.com/cjsh/download.cgi<http://jonathanscorner.com/cjsh/download.cgi>.
> The code I am working on is:
> 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)
> What needs changing here and how should I change it so that
> handle_signal() is called and then things keep on ticking?
I don't know if this is the answer, but this typo stood out: signl

signal.signal(signal.SIGTSTP, handle_signl)
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