dann frazier wrote:
On Thu, Dec 07, 2006 at 01:48:43PM -0500, Woody Suwalski wrote:
Physically you are correct.
However we really want to use /dev/temperature which is a SUPERSET of Linux /dev/temp. We have not much use of /dev/temp without this extra
functionality.
I see it is rather for cross-incompability between architectures: there is nothing wrong with trying to run Netwinder user-mode programs on any other
architecture, but I do not want to actually mess with _their_ /dev/temp, but get out if no propriatory /dev/temperature exists. Simply on Netwinder
with udev /dev/temp happens to provide this extra functionality. BTW. You can run etch without udev, as I have demonstrated up to today ;-)
So if "temperature" is not propriatory enough, it may need to be renamed to nw_temperature or so. But this will break (maybe non-existant) historical
back-compatibility, so I would prefer to leave it...
Thanks for your quick replies.
I don't necessarily disagree with you, I just don't have the context
to understand. I think the biggest piece I am missing is:
Under what circumstances is /dev/temp created with a different
major/minor than /dev/temperature?
I assert that if /dev/temp and /dev/temperature always have the same
major/minor, they always behave the same way and backwards
compatability can be maintained by having the application look for
both /dev entries, and use whichever one is available. A udev symlink
is also an option here - but it seems easier and cleaner to avoid
messing with udev and just deal with it in nwutil.
Apologies in advance for leaving this discussion midstream, I'll be
offline for the next few days.
Since /dev/temperature is a superset of /dev/temp, it is always using
same major:minor.
Applications (except for fand, this may be fixed) are already using
/dev/temp if /dev/temperature does not exist.
However I still think that is worth "acenting" that on Netwinder we
actually need an "enhanced" /dev/temp, which historically was called
"dev/temperature". Physically both are the same (vide /dev/loop0 and
/dev/loop/0).
The nwutil package can quite easily add the
z65_netwinder_temperature.rules file to /etc/udev/rules.d, where it will
not harm if udev is not installed.
However if you see that "/dev/temperature" name is potentially
conflicting with other architectures, we may drop the backward
compatibility and switch to /dev/temp.
The manpage has been written in pre-udev times and is supposed to give a
hint to the user, why the utilities might be not functional...
Woody
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