Message-ID: <416C7833.7000000@nortelnetworks.com>
Date: Tue, 12 Oct 2004 18:34:59 -0600
From: Chris Friesen <cfriesen@nortelnetworks.com>
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To: george@mvista.com
CC: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: question about linux time change
References: <4165AFBC.8010605@nortelnetworks.com> <416C6A33.6030202@mvista.com>
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George Anzinger wrote:
> Chris Friesen wrote:
> 
>>
>> I have been asked to add the ability to notify userspace when the time 
>> of day changes.  The actual notification is the easy part.  I'm having 
>> issues with where exactly the time is really changed.
> 
> 
> Just what sort of time changes do you want to notify on?  The ntp code 
> "drifts" time a lot.  Do you want to know about this?  If it is only 
> cases where there is a jump in time, you might do well to look at 
> "clock_was_set()".  It is in kernel/posix-timers.c and is called when 
> ever do_settimeofday() is called AND on leap second calls.
> 
> You will even find code in there to push the ladder out of the softirq 
> context.


Cool.  Will do.

Chris
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