Re: Cancel Sleep

Subject: Re: Cancel Sleep
From: Brian Bergstrand <email@hidden>
Date: Sat, 29 Dec 2007 16:14:14 +0200
Delivered-to: email@hidden
Delivered-to: email@hidden


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

Hi,
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.


#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*);

int main(int argc, char* argv[]) { IONotificationPortRef portRef; io_object_t notifier; CFRunLoopSourceRef source; powerPort = IORegisterForSystemPower (NULL, &portRef, iokpm_callback, &notifier); 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;

        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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References:
	>Cancel Sleep (From: Andrew James <email@hidden>)