process wrapper?

Steve @ Waypath steve at waypath.com
Mon Mar 29 03:29:56 CEST 2004


I need help. I'm trying to write a process wrapper class in Python (on
Linux) that let's one:
 - read service definitions from a config file (where a service definition
includes a bash command to start the service, and the service is a daemon)
 - call a method that will start up the service
 - call a method that will shut down the service.
 - other stuff not relevant here

Where I'm stumped is in starting up the service in a way that:
 - doesn't block the running of the main process (i.e. returns control back
to the wrapper, so it will listen for more commands)
 - let's me get some kind of handle on the started service that I can later
use to shut down the service.

I've tried every implementation of os.system, os.popen*, os.spawn* , and
(os.fork + os.exec*) for which I can find an example or that I can imagine,
but I can't come up with anything that works for me.  os.spawnv() looked
very promising, but every process I start with it goes defunct.

I won't bore you with examples of stuff that doesn't work. I've tried so
many things, my head is spinning. I don't care if I wrap the process in a
handler that my main process controls/kills or if I spin off a process but
track it's PID, to kill later. I don't care if the PID is in memory or
written to a file I can read later.

Can anyone point me in the right direction?





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