Re: [PATCH] hwclock: flush stdout in hwclock -c

[Alexey Galakhov <agalakhov@gmail.com>]

Hello William,

Am Sun, 19 Apr 2015 20:34:19 -0400
schrieb J William Piggott <elseifthen@gmx.com>:

>  I've been advocating for the removal of the compare function. One of
> my justifications for doing so is that it has been broken from day
> one and therefore nobody can be using for anything.
> 
>  So could you tell me how you are using it, and what useful purpose
> it is serving for you?

We use it in an automated test of the Linux system time on an embedded
system. Recently we fixed a kernel bug introduced by one of the 3rd
party patches that caused a huge (0.01%-0.1%) drift of the
CLOCK_REALTIME due to incorrect PLL initialization. The corresponding
test based on hwclock's compare is now added to our automated test
system. The test runs hwclock -c forever and fails if any drift
anomality is discovered.

Looks like hwclock -c works correctly at least in our case. I think it
could be rewritten using clock_gettime() instead of gettimeofday().

Regards,
Alexey