linux-kernel - Re: [patch] adjtimex.2: add explanation about ADJ

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Message-ID: <20141128210043.GB14432@localhost.localdomain>
Date:	Fri, 28 Nov 2014 22:00:43 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	Laurent Georget <laurent.georget@...elec.fr>
Cc:	mtk.manpages@...il.com, linux-man@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] adjtimex.2: add explanation about ADJ_TAI action

On Fri, Nov 28, 2014 at 02:40:44PM +0100, Laurent Georget wrote:
> @@ -101,7 +99,19 @@ combination of zero or more of the following bits:
>  Ordinary users are restricted to a zero value for
>  .IR modes .
>  Only the superuser may set any parameters.
> +.PP
> +Support for TAI (Atomic International Time, for a complete explanation
> about
> +what it is and what is the difference between TAI and UTC, see
> +.UR http://www.bipm.org/en/bipm/tai/tai.html
> +.I BIPM
> +.UE )
> +has been added in version 2.6.29. For any clock, the TAI offset may

Not for "any clock", just for CLOCK_REALTIME.

> +be calculated by adding a value to the UTC offset which is updated when a
> +leap second is added or deleted.
>  .br
> +All the offsets in the timex structure are expressed between the value
> of the
> +clock and the corresponding value (e.g. TAI offset is the difference
> between
> +the clock and the TAI, not between TAI and another value such as UTC).

The TAI offset is just (TAI - UTC). That's all.

Thanks,
Richard
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