On Sat, Mar 13, 2010 at 12:28:50PM +0200, Timo Juhani Lindfors wrote:
> Implement new option --predict-hc that predicts what the RTC will read
> at a time given by the --date option. This is useful for example if
> you need to setup an RTC wakeup time to distant future and want to
> account for the RTC drift.
Interesting idea :-)
Applied with a small change, I have renamed --predict-hc to --predict
(because we have --set, --show, etc. commands).
> + } else if (predict_hc) {
> + int adjustment;
> + double retro;
> +
> + calculate_adjustment(adjtime.drift_factor,
> + adjtime.last_adj_time,
> + adjtime.not_adjusted,
> + set_time,
> + &adjustment, &retro);
> + if (debug) {
> + printf(_("At %ld seconds after 1969, RTC is predicted to read %ld seconds after 1969.\n"),
> + set_time, set_time + adjustment);
> + }
> + display_time(TRUE, set_time + adjustment, -retro);
> }
I see a small nit here. You can specify --date from past:
# hwclock --predict --date "1/1/2000 16:00:00"
Sat 01 Jan 2000 03:59:49 PM CET 0.376034 seconds
not sure what this prediction means :-) Maybe we need to check that set_time
value is greater than gettimeofday().
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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