linux-kernel - Re: [PATCH 2/2] posix clocks: introduce a sysfs presence.

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Message-ID: <20100910093135.GB10179@riccoc20.at.omicron.at>
Date:	Fri, 10 Sep 2010 11:31:35 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 2/2] posix clocks: introduce a sysfs presence.

On Fri, Sep 10, 2010 at 12:00:08AM +0100, Alan Cox wrote:
> Also we have existing time sources that don't follow the poxix clock
> model - I can open /dev/rtc and I can open the hpet and so on.
> 
> I like /sys/class/time* *but* you need to be able to open the sysfs
> device and apply operations to it in order for it to work when your closk
> can be dynamically created and destroyed and to get a sane Unix API.
> 
> To start with try applying permissions to clock sources via the POSIX
> API. That is something that will be required for some applications.
> 
> I need to be able to open sys/clock/foo/something and get a meaningful
> handle. Sure it's quite likely the operations it supports are related to
> the POSIX timer ops.

Do you mean this:

   id = read(/sys/clock/foo/lock); /* clock is busy, cannot be removed */
   ...
   clock_gettime(id, ts);
   ...
   write(/sys/clock/foo/release, id); /* all done with clock */

I am not sure what you are describing. Can you give an example, like
pseudocode or something?

Thanks,
Richard
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