daisydog: standardize exit paths

Use err to display errno messages & exit.  This standardizes
the messaging & makes the code slightly smaller.

BUG=None
TEST=CQ passes

Change-Id: I9184557b5841aa91691039c1babca3105c104761
Reviewed-on: https://chromium-review.googlesource.com/1829780
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
1 file changed
tree: 69123874bc250bb615c60d6daf7eb45dfe3d7e90
  1. 51-watchdog.rules
  2. COPYING
  3. Makefile
  4. OWNERS
  5. PRESUBMIT.cfg
  6. README.md
  7. daisydog.c
  8. daisydog.conf
README.md

GPL Code is copied with explicit permission from Daniel Widyanto:
http://embeddedfreak.wordpress.com/2010/08/23/howto-use-linux-watchdog/

The project name is based on Samsung's “daisy” reference board design and I liked this quote from the daisy dog FAQ:

Daisy Dogs are not persnickety little ankle biters

When this daisydog doesn't run, the machine should reset. :)

An alternative code to start with would have been:
https://dev.openwrt.org/ticket/2270

The watchdog project is alot more complicated than what the Chromium OS project needs.