| Re: [chrony-dev] timepps.h and chrony |
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On Sat, Jan 21, 2012 at 11:04:06AM -0800, Bill Unruh wrote:
> Perhaps it would be a good idea to include the file timepps.h into the chrony
> source files, and use it instead of the one that is supposed to be in
> /usr/include. a)It seems on a variety of systems, timepps.h is in a
> variety of places (eg /usr/include/linux instead of /usr/include
> where chrony looks for it. ntp
> in their source code has their own version which looks for timepps.h in a
> variety of possible places. chrony might do the same)
The configure script in current git looks for timepps.h in
/usr/include and /usr/include/sys, similarly to what ntp does.
> b) timepps.h does not seem to be included in at least some distributions which
> have the pps_core etc modules and thus support the pps api. For those it would
> be good to have timepps.h in the chrony sources.
Yeah, there doesn't seem to be a good place where to put the file.
It's a wrapper for the ioctls to provide the API specified by the PPS
RFC and ideally the implementation would be in a dynamic library, not
in a header. And it doesn't belong to the kernel or glibc.
Some distributions now have a pps-tools(-devel) package which includes
the header. Perhaps someone can submit a new package to Mandriva?
> Ie, the refclock drivers could look for chrony-timepps.h locally which looks
> in /usr/include, /usr/include/linux and finally locally in the chrony sources.
Instead of including and maintaining such system specific file I'd
rather add a link to the documentation where it can be found.
> I ran into this with Mandriva 2010.x and 2011 which has the pps_core but does
> not have the timepps.h anywhere. Of course what happened was that configure
> found that the test program did not compile and simply removed the pps as an
> option. This is compounded by the fact that earlier versions of
> Mandriva have pps_core module but
> did not even have /usr/include/linux/pps.h But it would seems that
> pps.h is pretty useless without timepps.h as well, but
> I may be wrong.
You'll probably need also the pps_ldisc module, some earlier kernels
didn't have it.
--
Miroslav Lichvar
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