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- To: chrony-dev@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-dev] chronyd and hwclock
- From: Dustin Marquess <jailbird@xxxxxxx>
- Date: Sat, 22 Feb 2020 22:07:32 -0600
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I'm guessing you have the rtcsync option enabled in chrony.conf. That
probably is what is doing it.
-Dustin
On Sat, Feb 22, 2020 at 7:15 PM Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>
> If I run chronyc, I get the following from hwclock
>
> [root]>hwclock --verbose
> hwclock from util-linux 2.33.2
> System Time: 1582419894.572200
> Trying to open: /dev/rtc0
> No usable clock interface found.
> hwclock: Cannot access the Hardware Clock via any known method.
>
> Does chronyd purposely block access to the hardware clock?
>
> cat /sys/class/rtc/rtc0/time
> does give the rtc time as does the date file. So the hardware clock is
> running.
> Doing an strace on hwclock while chrony is running gives
> openat(AT_FDCWD, "/dev/rtc0", O_RDONLY) = -1 EBUSY (Device or resource busy)
>
> so I presume that it is chrony that is blocking rtc0.
>
> Is that on purpose? Or could it be opened when chronyd wants to read or write
> the rtc, and closed otherwise. (after all, after the first millisecond, chrony
> does not use the hardware clock, except with explicit reads)
>
>
> William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
> Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
> UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
> Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/
>
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