Advantech RSB-4210 Evaluation Kit User Manual download pdf (Page 96)

RSB-4210 User Manual 88

There is also a get function for getting the pretimeout:

ioctl(fd, WDIOC_GETPRETIMEOUT, &timeout);

printf("The pretimeout was is %d seconds\n", timeout);

Not all watchdog drivers will support a pretimeout.

Get the number of seconds before reboot:

Some watchdog drivers have the ability to report the remaining time before the sys-

tem will reboot. The WDIOC_GETTIMELEFT is the ioctl that returns the number of

seconds before reboot.

ioctl(fd, WDIOC_GETTIMELEFT, &timeleft);

printf("The timeout was is %d seconds\n", timeleft);

3.11.8.5 Environmental monitoring:

All watchdog drivers are required return more information about the system, some do

temperature, fan and power level monitoring, some can tell you the reason for the

last reboot of the system. The GETSUPPORT ioctl is available to ask what the

device can do:

struct watchdog_info ident;

ioctl(fd, WDIOC_GETSUPPORT, &ident);

the fields returned in the ident struct are:

identity a string identifying the watchdog driver

firmware_version the firmware version of the card if available

options a flags describing what the device supports

WDIOF_OVERHEAT Reset due to CPU overheat

The machine was last rebooted by the watchdog because the thermal limit was

exceeded

WDIOF_FANFAULT Fan failed

A system fan monitored by the watchdog card has failed

WDIOF_EXTERN1 External relay 1

External monitoring relay/source 1 was triggered. Controllers intended for real world

applications include external monitoring pins that will trigger a reset.

WDIOF_EXTERN2 External relay 2

External monitoring relay/source 2 was triggered

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Advantech RSB-4210 Evaluation Kit User Manual Page 96