Open Radar

 
22-Oct-2009 07:41 PM Patrick Stein:
Summary: IOPSCopyPowerSourcesInfo() returns NULL on a MacBook Pro.

Steps to reproduce: With some (not all) MacBook Pros a call to IOPSCopyPowerSourcesInfo() will return NULL during boot. 
I do have a program that has a LaunchDaemon to be started via launchd . When that daemon is started it tests first for the availability of a battery and doing that via IOPSCopyPowerSourcesInfo(). This call does return NULL at first and a few seconds later works.

Expected:
I should always get back a correct value on a machine with a battery installed.

Workaround:
I now have a workaround in the program ( just retrying every few seconds ( up to a minute) ) but I don't like this kind of approch. 

Notes: The program that uses it is SmartSleep when set to smartsleep. It will spit out this error like this:


22.10.09 18:50:16	de.jinx.SmartSleepDaemon[41]	hibernation.currentstate(
22.10.09 18:50:16	de.jinx.SmartSleepDaemon[41]	): list of powersources is empty).
22.10.09 18:50:16	de.jinx.SmartSleepDaemon[41]	hibernation.currentstate() : did not get IOPSC
22.10.09 18:50:16	de.jinx.SmartSleepDaemon[41]	opyPowerSourcesIn
22.10.09 18:50:16	de.jinx.SmartSleepDaemon[41]	fo()
22.10.09 18:50:16	de.jinx.SmartSleepDaemon[41]	machine_has_battery(): powersystem not in place - waiting.
22.10.09 18:50:21	de.jinx.SmartSleepDaemon[41]	machine_has_battery(): powersystem now up and running.


As you see after 5 seconds its working.


Best Regards - Patrick Stein

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