linux-kernel - Re: [PATCH] LinuxPPS (with new syscalls API)

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Message-ID: <20070630171340.GT13886@enneenne.com>
Date:	Sat, 30 Jun 2007 19:13:40 +0200
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] LinuxPPS (with new syscalls API) - new version

On Fri, Jun 29, 2007 at 05:40:52PM +0100, David Woodhouse wrote:
> 
> Remember you have to support _both_ 32-bit and 64-bit system calls. You
> need to define struct compat_pps_info and struct compat_pps_params, and 
> you'll have to provide a compat wrapper for sys_time_pps_getparams() and
> sys_time_pps_setparams(). You'll also need to extend your
> compat_sys_time_pps_fetch() wrapper to handle the struct pps_info too.

At this point I'm seriously considfering your previous suggestion:

   Had you considered changing the API so that you don't need the
   compatibility wrapper at all? Could you take an integer number of
   µS or ms instead of a struct timespec?

Maybe I can define a special struct for exchanging time data as:

   struct pps_timedata_s {
      long sec;
      long nsec;
   }

and managing time data conversions at userland...

What do you think about that? :)

Thanks,

Rodolfo

-- 

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