Difference between revisions of "Watchdog"

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(How to disable Watchdog)
(Background information)
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http://docs.info.apple.com/article.html?artnum=106588&coll=cp (However, on the Apple TV, there is no /etc/watchdog.conf, other than what this document is saying)
 
http://docs.info.apple.com/article.html?artnum=106588&coll=cp (However, on the Apple TV, there is no /etc/watchdog.conf, other than what this document is saying)
  
Watchdog is not used in Mac OS X 10.4: look at [http://developer.apple.com/macosx/launchd.html launchd].
+
Watchdog is not used in Mac OS X 10.4: look at [http://developer.apple.com/macosx/launchd.html launchd].  This is referring to a software watchdog and is probably unrelated to the rebooting problem.

Revision as of 17:25, 24 March 2007

What is Watchdog

Watchdog reboots the Apple TV it if the GUI isn't running.

How to disable Watchdog

Apparently BackRow.framework tells Watchdog that "we are up and running":

strings /System/Library/PrivateFrameworks/BackRow.framework/Versions/A/BackRow
(...)
BRSettingsHelper tellWatchdogWeAreUpAndRunning

This function seems to reset the boot count but does not prevent the machine from rebooting.
There is also the key:
_kRUIAutoRestartIntervalKey

which is probably used in one of:

-[RUIPreferences boolForKey:]
-[RUIPreferences boolForKey:withValueForMissingPrefs:]
-[RUIPreferences canSetPreferencesForKey:]
-[RUIPreferences descriptionForKey:]
-[RUIPreferences floatForKey:]
-[RUIPreferences integerForKey:]
-[RUIPreferences objectForKey:]
-[RUIPreferences setBool:forKey:]
-[RUIPreferences setFloat:forKey:]
-[RUIPreferences setInteger:forKey:]
-[RUIPreferences setObject:forKey:]
-[RUIPreferences stringForKey:]

This seems to indicate that the auto reboot interval is stored as a key somewhere. I don't know if this is simply used for the Finder.app or if there is something else on the system that will use this.

SettingsHelper has a reference to "/sbin/shutdown -r now"

Symlinking /sbin/shutdown to /usr/bin/true makes the shutdown command do nothing

Background information

This Apple document about Watchdog may shed some light:

http://docs.info.apple.com/article.html?artnum=106588&coll=cp (However, on the Apple TV, there is no /etc/watchdog.conf, other than what this document is saying)

Watchdog is not used in Mac OS X 10.4: look at launchd. This is referring to a software watchdog and is probably unrelated to the rebooting problem.