June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Adding a watchdog
Watchdogs are a common requirement in embedded devices: you need to take action if a critical service stops working, usually by resetting the system. On most embedded SoCs, there is a hardware watchdog, which can be accessed via the /dev/watchdog device node. The watchdog is initialized with a timeout at boot, and then must be reset within that period, otherwise the watchdog will be triggered and the system will reboot. The interface with the watchdog driver is described in the kernel source in Documentation/watchdog and the code for the drivers is in drivers/watchdog.
A problem arises if there are two or more critical services that need to be protected by a watchdog. systemd has a useful feature that distributes the watchdog ...
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