On 08/17/2015 10:15 PM, Pratyush Anand wrote:
Hi,
I am looking for the best way to know if a watchdog has been kicked and active.
I can see a way is to read timeout(WDIOC_GETTIMEOUT) and timeleft(
WDIOC_GETTIMELEFT). If they do not match, it means that wdt is active.
But what if we tried to read timeleft just in time when watchdog daemon/or some
other application had kicked it. May be we read timeleft twice at the interval
of 1 sec.
Please let me know if there is any other alternative which could be a better way
to know if watchdog is active? Or may be it would be good to implement an ioctl
WDIOC_ACTIVE?
Normally the watchdog is active if the watchdog device is open, unless the
application controlling it explicitly disabled it with WDIOC_SETOPTIONS.
Therefore, the controlling application should always know the status.
A different application can not open the watchdog device, so it won't be
able to get its status using an ioctl anyway.
Why is that insufficient ?
Guenter
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