Determining if program executing in shell background?
lucio
lucio at movilogic.com
Fri Mar 28 17:36:37 EST 2003
sik0fewl wrote:
> Kevin Perrott wrote:
>
>> I'm VERY new to python programming so please be gentle.
>>
>> I'm trying to find a function that will tell me if a pyton program is
>> executing in the background when launched using the:
>>
>> <program name> &
>>
>> shell syntax.
>
>
> If it's not a problem you could run the program having stdout and
> stderr pipe to /dev/null and put to background:
>
> program.py 2>&1 >/dev/null &
>
> or have a -D switch that changes sys.stdout and sys.stderr to a custom
> class that does nothing.
>
> I'm honestly not sure if there is a better way to do this, but if this
> is being run automatically, instead of by the user either of the above
> solutions should be fine.
Maybe the trick is to try to read from stdin, and catch SIGSTOP..
check out the following shell output
-------------------------------- 8<---------
lucio at patoruzu:~/a$ vi &
[1] 31094
lucio at patoruzu:~/a$
[1]+ Stopped vi
lucio at patoruzu:~/a$
------------------------------------------
When bash 'stopped' vi, i belive it sent some singnal.
HTH,
Lucio.
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