The ntwdt driver provides several application programming interfaces (APIs) to application programs.
You must open the /dev/ntwdt device node before issuing the watchdog ioctls.
Note that only a single instance of open() is allowed on /dev/ntwdt; more than one instance of open() will generate the following error message:
EAGAIN The driver is busy, try again.
The following APIs are used with the ALOM watchdog timer:
Understanding the ALOM watchdog timer