Shutdown hook

[Steve]

Does any one know if python has the ability to run a shutdown hook.

For example you set a method to run when the python process is shutting
down, like it recieved a kill signal?

Basically looking for an effect like the following java code.
Runtime.getRunt ime().addShutdo wnHook(new Thread(this));

[Ben Finney]

Re: Shutdown hook

Steve <steve.morin@gm ail.com> wrote:[color=blue]
> Does any one know if python has the ability to run a shutdown hook.[/color]

When the Python runtime system wants to exit, it raises a SystemExit
exception.

Catch that exception at the top level of your code, and do whatever
you like. (It might be polite to actually exit at some point, of
course. sys.exit(exitco de) will do so -- raising another SystemExit
exception.)

--
\ "I took it easy today. I just pretty much layed around in my |
`\ underwear all day. ... Got kicked out of quite a few places, |
_o__) though." -- Bug-Eyed Earl, _Red Meat_ |
Ben Finney

[Steve]

Re: Shutdown hook

Thanks do appreciate it

--

Lisp Programming - You don't know what your missing ...

=============== =============== ========
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[Lawrence Oluyede]

Re: Shutdown hook

Il 2005-11-15, Ben Finney <bignose+hate s-spam@benfinney. id.au> ha scritto:[color=blue]
> Steve <steve.morin@gm ail.com> wrote:[color=green]
>> Does any one know if python has the ability to run a shutdown hook.[/color]
>
> When the Python runtime system wants to exit, it raises a SystemExit
> exception.
>
> Catch that exception at the top level of your code, and do whatever
> you like. (It might be polite to actually exit at some point, of
> course. sys.exit(exitco de) will do so -- raising another SystemExit
> exception.)
>[/color]

I think using atexit module -
http://docs.python.org/lib/module-atexit.html is cleaner



--
Lawrence - http://www.oluyede.org/blog
"Anyone can freely use whatever he wants but the light at the end
of the tunnel for most of his problems is Python"

[Lawrence Oluyede]

Re: Shutdown hook

Il 2005-11-15, Ben Finney <bignose+hate s-spam@benfinney. id.au> ha scritto:[color=blue]
> Steve <steve.morin@gm ail.com> wrote:[color=green]
>> Does any one know if python has the ability to run a shutdown hook.[/color]
>
> When the Python runtime system wants to exit, it raises a SystemExit
> exception.
>
> Catch that exception at the top level of your code, and do whatever
> you like. (It might be polite to actually exit at some point, of
> course. sys.exit(exitco de) will do so -- raising another SystemExit
> exception.)
>[/color]

I think using atexit module -
http://docs.python.org/lib/module-atexit.html is cleaner



--
Lawrence - http://www.oluyede.org/blog
"Anyone can freely use whatever he wants but the light at the end
of the tunnel for most of his problems is Python"

[Duncan Booth]

Re: Shutdown hook

Lawrence Oluyede wrote:
[color=blue]
> Il 2005-11-15, Ben Finney <bignose+hate s-spam@benfinney. id.au> ha
> scritto:[color=green]
>> Steve <steve.morin@gm ail.com> wrote:[color=darkred]
>>> Does any one know if python has the ability to run a shutdown hook.[/color]
>>
>> When the Python runtime system wants to exit, it raises a SystemExit
>> exception.
>>
>> Catch that exception at the top level of your code, and do whatever
>> you like. (It might be polite to actually exit at some point, of
>> course. sys.exit(exitco de) will do so -- raising another SystemExit
>> exception.)
>>[/color]
>
> I think using atexit module -
> http://docs.python.org/lib/module-atexit.html is cleaner
>[/color]
Correct, although this won't catch all cases where a program is exiting.
For example, on Windows, if you use Ctrl+C to terminate a program the
atexit function *is* called, but if you use Ctrl+Break the atexit function
is not called unless you install a suitable signal handler:

import signal
def sigbreak(signum , frame):
sys.exit("***br eak")

signal.signal(s ignal.SIGBREAK, sigbreak)

Even then there are still other ways to terminate a process which will not
be caught.

[Duncan Booth]

Re: Shutdown hook

Lawrence Oluyede wrote:
[color=blue]
> Il 2005-11-15, Ben Finney <bignose+hate s-spam@benfinney. id.au> ha
> scritto:[color=green]
>> Steve <steve.morin@gm ail.com> wrote:[color=darkred]
>>> Does any one know if python has the ability to run a shutdown hook.[/color]
>>
>> When the Python runtime system wants to exit, it raises a SystemExit
>> exception.
>>
>> Catch that exception at the top level of your code, and do whatever
>> you like. (It might be polite to actually exit at some point, of
>> course. sys.exit(exitco de) will do so -- raising another SystemExit
>> exception.)
>>[/color]
>
> I think using atexit module -
> http://docs.python.org/lib/module-atexit.html is cleaner
>[/color]
Correct, although this won't catch all cases where a program is exiting.
For example, on Windows, if you use Ctrl+C to terminate a program the
atexit function *is* called, but if you use Ctrl+Break the atexit function
is not called unless you install a suitable signal handler:

import signal
def sigbreak(signum , frame):
sys.exit("***br eak")

signal.signal(s ignal.SIGBREAK, sigbreak)

Even then there are still other ways to terminate a process which will not
be caught.

[wangminghua@gmail.com]

Re: Shutdown hook

great.
It's a good idea.

[wangminghua@gmail.com]

Re: Shutdown hook

great.
It's a good idea.

[Steve Juranich]

Re: Shutdown hook

On 15 Nov 2005 14:45:27 -0800, Steve <steve.morin@gm ail.com> wrote:[color=blue]
> Does any one know if python has the ability to run a shutdown hook.[/color]

Look at the "atexit" module.

barbet (~)$ pydoc atexit.register
Help on function register in atexit:

atexit.register = register(func, *targs, **kargs)
register a function to be executed upon normal program termination

func - function to be called at exit
targs - optional arguments to pass to func
kargs - optional keyword arguments to pass to func
--
Steve Juranich
Tucson, AZ
USA

[Steve Juranich]

Re: Shutdown hook

On 15 Nov 2005 14:45:27 -0800, Steve <steve.morin@gm ail.com> wrote:[color=blue]
> Does any one know if python has the ability to run a shutdown hook.[/color]

Look at the "atexit" module.

barbet (~)$ pydoc atexit.register
Help on function register in atexit:

atexit.register = register(func, *targs, **kargs)
register a function to be executed upon normal program termination

func - function to be called at exit
targs - optional arguments to pass to func
kargs - optional keyword arguments to pass to func
--
Steve Juranich
Tucson, AZ
USA