[systemd-devel] How to get hardware watchdog status when using systemd

[Wiktor Kwapisiewicz]

On 28.05.2019 14:00, Zbigniew Jędrzejewski-Szmek wrote:
> This currently isn't exported by systemd, and there's even no log
> message at debug level. I guess this could be exposed, but I don't
> think it'd be very useful. If the watchdog ping works, most people
> don't need to look at it. If it doesn't, the machine should reboot...

Yes. Maybe I should be more clear in my goal: enabling the systemd 
option to ping the watchdog doesn't have any visible effects until the 
system hangs. I wanted to see an "effect" without resorting to "echo c > 
/proc/sysrq-trigger".

> If this is just for debugging, you can do something like
> 
>    sudo strace -e ioctl -p 1
> 
> and look for WDIOC_KEEPALIVE.

Yes, this is exactly what I was looking for! As far as I can see adding 
"-r" to strace prints nice relative times that correspond to the 
"RuntimeWatchdogSec" value.

Thank you very much!

Kind regards,
Wiktor

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