Python Process that can survive

[sismex01 at hebmex.com]

> From: peeryc at hotmail.com [mailto:peeryc at hotmail.com]
> 
> Alright... I love python but I think I may have found a definite
> problem. I can't seem to run a python process, kick it to the
> back-ground, and then kill the terminal that started it. With most
> other things, the python process would keep running in the
> back-ground regardless. For me, the process always dies with the
> terminal.
> 
> So my question: is there a way to separate a python script from the
> underlying terminal so that this will not happen.
> 
> I'm hoping for some scheme that's supported by the language. I've
> found a few hacks on-line where the python process is daemonized
> but this requires shutting down all the standard io streams.
> There's got to be a better way especially since it can be done in
> Perl very easily with no special tricks.
> 
> By the way, I'm doing this on a linux box.
> 
> Chris
> 

This same question I asked a few weeks ago, and got a few
answers back from lotsa nice peepl, so I pass this function
on to you for it's safekeeping (tag, your it ;-)

def Daemonize():
   "Detach the current process from the console."
   import os, sys
   if os.fork(): os._exit(0)

   # Close connection to current console.
   os.close(sys.__stdin__.fileno())
   os.close(sys.__stdout__.fileno())
   os.close(sys.__stderr__.fileno())

   # Reopen std handles to /dev/null.
   dev_null = os.open("/dev/null", 0)
   os.dup2(dev_null, 0)
   os.dup2(dev_null, 1)
   os.dup2(dev_null, 2)

   # Create new OS session.
   os.setsid()

   # Reset UMASK.
   os.umask(0)

   # Refork to have init as parent.
   if os.fork(): os._exit(0)


This is a synthesis of several replies I received, and it
seems to work, but others might have some observations
to make to this little function.

HTH!

-gustavo










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