[haiku-development] Re: time prefs and timezone at all
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Fri, 05 Oct 2007 14:02:57 +0200 CEST
Julun <HOST.HAIKU@xxxxxx> wrote:
> first of all the gmt and local time setting does not affect the
> system
> clock. while looking for the issue behind, i noticed that it does not
> call the required system calls to change the timezone. changing
> system
> time between gmt and local means we should call
> _kern_set_tzfilename(...) with the gmt bool true or false and
> adjusting
> the time offset with _kern_set_timezone(...). this seems to fail.
It doesn't really look like this can even fail; for the implementation
details please have a look at src/system/kernel/real_time_clock.c
Looking at the API provided there, it doesn't really look that
convincing, though.
Also, there is a TODO comment in _user_set_tzfilename() that looks like
it could be the cause of what you're experiencing.
> so i was looking into the source of clockconfig.c how it's done there
> and it uses the way discribed above. looking thru the code i found
> the
> comment "// we don't care if not RTC settings is found, default is
> local" and i think this assumption is false. (see the notice at the
> bottom) we should assume that the system is running in utc and not
> local
> time, as local time would only be default for windows like system,
> see:
>
> http://www.cl.cam.ac.uk/~mgk25/mswish/ut-rtc.html
Even though I agree with that article, Windows is *much* more common on
the home desktop than anything else, and thus, the default to UTC might
still viable.
[...]
> i have no real question, but it would be nice if some of the kernel
> dev's can comment on this and how it should work. should i create a
> bugreport on this?
If you don't want to fix it yourself, please do :-)
> Notice: to be not relying upon the assumption the system runs utc, we
> should ask during install (when the installer is there) and set the
> value properly in the RTC_time_settings file and the timezone link.
I don't think that this should be presented on install - usually you
just don't know. I think the installation process should be as smart as
possible in this regard (either check if there is a Windows installed,
or where the system is located via checking the IP address, or
whatever).
> why is that on present at all and points to Paris?
Because Korli set that up, and he is French :-)
Bye,
Axel.
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