[Python-ideas] Draft PEP: Standard daemon process library]

Ben Finney ben+python at benfinney.id.au
Wed Jan 28 05:21:42 CET 2009


Trent Nelson writes:

>     What are you left with at the end of the day? Something you can
>     start, stop, query status, and log out and have it still run.

This presupposes a point of view (“you”) that is someone *running*
the program. For that point of view, this PEP is irrelevant.

The audience for the current PEP, on the other hand, is a programmer
*writing* such a program, who sees the API as addressing just one of
the many and varied things their program needs to do.

>     How you got there (daemonising the current process) surely isn't
>     as important as where you ended

I'm specifying an API, and trying to make it so people will want to
use it for the purpose it's designed for. So yes, to the extent that
“how you got there” includes programming to an API, I think it is
very important in this context.

>     So I can't persuade you from shifting focus from "When writing a
>     Unix daemon program, I ...", to "When writing a cross-platform
>     daemon/service, I ..."?

I could potentially be persuaded, but the “run an additional process
as a service” model is definitely not a problem I need solved. Given
that, I'm not likely to be a good champion for it.

Meanwhile, the focus of this PEP *does* meet a need shared by many
(“daemonise the current running program”), and I see value in
keeping it focussed on that.

>     Sidebar: this definition on the Qt page caught my attention:
> 
>         "A Windows service or Unix daemon (a "service"), 
>          is a program that runs regardless of whether a 
>          user is logged in or not."

I noticed that too, and it didn't strike any chord with me. It seems
targeted to people who want to write an MS Windows service that also
happens to run on Unix. Those people doubtless exist, and deserve to
find solutions to their challenges; but I'm not one of them.

> If you're vehemently against the notion of a cross-platform
> implementation that utilised Windows services

You are arguing against a position I've never taken. I repeat: if
someone else wants what you're describing, more power to them, and I
don't intend to get in their way. But it's not going to be me that
writes that PEP nor the implementation for it.

-- 
 \      “If you fell down yesterday, stand up today.” —_The Anatomy of |
  `\                                   Frustration_, H. G. Wells, 1936 |
_o__)                                                                  |
Ben Finney




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