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

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Message-ID: <20100911002020.GA20252@kroah.com>
Date:	Fri, 10 Sep 2010 17:20:20 -0700
From:	Greg KH <greg@...ah.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, 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 11:31:35AM +0200, Richard Cochran wrote:
> 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 */

That's not for sysfs, if you want to do something like this, create
clockfs please :)

thanks,

greg k-h
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