[ILUG] [OT] C time_elapsed function

[Colm MacCarthaigh]

On Tue, Nov 06, 2001 at 06:41:37PM -0000, Kenn Humborg wrote:
> > On Tue, Nov 06, 2001 at 06:28:44PM +0000, Padraig Brady wrote:
> > > This just gives the boot time (in seconds since 1970) as far
> > > as I can tell. Hence not what I want. I want the actual number
> > > of seconds elapsed since boot, and I can't use BOOT_TIME-time(0)
> > > as if the system date changes, this will be inaccurate.
> > 
> > 
> > oh yeah, sorry, the wtmp also keeps a record of clock skews,
> > flaged as OLD_TIME and NEW_TIME
> > 
> > man wtmp for more :o)
> 
> I did, and it seems that date(1) is responsible for adding
> the OLD/NEW_TIME records.  What about ntpdate?  xntpd?
>

if implementations have as big a bug as ignoring the wtmp
then those implementations should be fixed, you shouldnt
work around their buggy implementations.

Afaik the two you mentioned do change it, well my ntpd
certainly does anyway :)

I'm not entirely sure if this isnt done at the library
level anyway, can't find the source for stime, and
some object analysis of "date" doesnt seem to inidicate it 
opens the wtmp itself, dunno :)
 
> There's more than one way to set the date :-)

nope, more than one implemenation maybe :)

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