Greetings,
I have been reading through documentation and mailing list archives
for sometime in search of a particular bit of functionality
specific to apple laptops. I need to catch and veto hard sleep
caused by the closing of a laptop lid on system running OS 10.4.
From my research I understand that this may be achieved through the
Kernel, likely through a KEXT.
I have looked at the example RegisterForSleep, which shows how a
program can register to listen for and handle system sleep calls.
This allows an application to prevent idle sleep and gives them the
oppourtunity to do some housekeeping before an impending hard
sleep, caused by closing the laptop, or clicking sleep from the
apple menu.
I have also looked at the KEXT called Insomnia* which when
installed prevents the system from going into hard sleep when the
laptop lid is closed. This is achieved by communicating with the
root power domain:
// Include <IOKit/pwr_mgt/RootDomain.h>
// Prevents hard sleep when closing lid. found in Insomnia::init()
IOPMrootDomain *root = getPMRootDomain();
root->receivePowerNotification(kIOPMDisableClamshell);
// Allows hard sleep when closing lid. found in Insomnia::free()
IOPMrootDomain *root = getPMRootDomain();
root->receivePowerNotification(kIOPMEnableClamshell);
* http://binaervarianz.de/projekte/programmieren/meltmac/
Though preventing sleep is part of the solution I need to
implement, more importantly I must be able to catch it, prevent
it. Attempting a combination of RegisterForSleep and Insomnia did
not do it. I loaded the KEXT when the event
kIOMessageSystemWillSleep was sent to my program but to no avail.
The system will sleep.
I have read a few brief snippets within the mailing list that said
it is possible to catch a hard sleep at the kernel level and veto
it, but I have yet to discover how to do this.
In an older version of <IOKIT/pwr_mgt/IOPM.h> I came across the
following enumeration definition:
// Power events
enum {
kClamshellClosedEventMask = (1<<0), // User closed lid
kDockingBarEventMask = (1<<1), // OBSOLETE
kACPlugEventMask = (1<<2), // User plugged or
unplugged adapter
kFrontPanelButtonEventMask = (1<<3), // User hit the front panel
button
kBatteryStatusEventMask = (1<<4) // Battery status has changed
};
kClamshellClosedEventMask looks very interesting. I don't have a
sense of how I could setup a event listener for this though. As
well, the current IOPM.h file on my system is actually without this
definition.
I appreciate any and all commentary.
Most humble regards,
Eric Coffin
mobileneurons
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