Re: Cancel Sleep

29 Dec 2007

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On Dec 29, 2007, at 1:35 PM, Andrew James wrote:
Hi,

#import <IOKit/IOMessage.h>
#import <IOKit/pwr_mgt/IOPMLib.h>
static io_connect_t powerPort = (io_connect_t)0;
static void iokpm_callback (void *, io_service_t, natural_t, void*);
        case kIOMessageCanSystemPowerOff:
            if (dontIdleSleep) {
                IOCancelPowerChange(powerPort, (long)arg);
            } else
                IOAllowPowerChange(powerPort, (long)arg);
        break;
        default:
        break;
    }
}

Brian Bergstrand
<http://www.bergstrand.org/brian/>   PGP Key ID: 0xB6C7B6A2
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How do i cancel a sleep event from happening, along with things like
the lid closing and causing a sleep.

_______________________________________________

You can only cancel idle sleep, not user initiated sleep (via the
power button, the Sleep menu, or closing the lid.
int main(int argc, char* argv[]) {

	IONotificationPortRef portRef;

        io_object_t notifier;

        CFRunLoopSourceRef source;

        powerPort = IORegisterForSystemPower (NULL, &portRef,
iokpm_callback, ¬ifier);

        if (powerPort) {

            source = IONotificationPortGetRunLoopSource(portRef);

            CFRunLoopAddSource([[NSRunLoop currentRunLoop]
getCFRunLoop], source, kCFRunLoopCommonModes);

        }

	[[NSRunLoop currentRunLoop] run];

}
static void iokpm_callback (void *myData, io_service_t service,
natural_t message, void *arg)

{

    switch(message) {

        // must always respond to the power state change messages

        case kIOMessageSystemWillSleep:

        case kIOMessageCanSystemSleep:

        // we can't prevent user initiated power off, only idle power
off

        case kIOMessageSystemWillPowerOff:

        case kIOMessageSystemWillRestart:

            IOAllowPowerChange(powerPort, (long)arg);

        break;
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