linux-kernel - Re: [PATCH] [RFC] notify userspace about time changes

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Message-ID: <4C5B3C65.8060703@zytor.com>
Date:	Thu, 05 Aug 2010 15:34:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	Greg KH <gregkh@...e.de>, john stultz <johnstul@...ibm.com>,
	Alexander Shishkin <virtuoso@...nd.org>, lkml@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jon Hunter <jon-hunter@...com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Avi Kivity <avi@...hat.com>, John Kacur <jkacur@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] notify userspace about time changes

On 08/05/2010 03:22 PM, Kay Sievers wrote:
> 
> I think that's really awkward interface, to pass file descriptor
> numbers around and write them to magic sysfs files.
> 
> I would very much prefer a file that contains the current time, and
> wakes up possible users with a POLL_ERR on changes caused by some
> other process. That works very well for things like /proc/mounts, is
> easy to get, and does not need a full page of weird instructions to
> get stuff done. :)
> 

Okay, what's wrong with having a file descriptor that gets *written to*
on a notification?  Why POLL_ERR?

	-hpa
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