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Editorial Team
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Asked: 2026-05-15T23:32:19+00:00

I want to wake system from sleep programmatically, is there any way to do

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I want to wake system from sleep programmatically, is there any way to do this?

I have read following link:
http://developer.apple.com/mac/library/qa/qa2004/qa1340.html

this only talk about getting notification , but not sure is there any way to wake system from sleep?

I appreciate some thread to the information…

Update:

As per the suggestion I tried with IOPMSchedulePowerEvent

Code I have used:

NSCalendarDate  *timeIntervalSinceNow = [NSCalendarDate dateWithTimeIntervalSinceNow:40];
IOReturn result = IOPMSchedulePowerEvent ((CFDateRef)timeIntervalSinceNow, NULL, CFSTR(kIOPMAutoWake));

Result:

It fails in MacBook if lid closed

Am I doing some thing wrong or Any solution?

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1 Answer

  1. Editorial Team

    You can schedule wake up events with IOPMSchedulePowerEvent through the power manager. You may be able to schedule an immediate wake up. pmset is a command line wrapper for the power manager. You can also prevent sleep with IOCancelPowerChange in certain cases.

    You may be able to prevent sleep or wake up by generating a mouse or key event. One way to generate events is with CGPostKeyboardEvent.

    Edit:

    Normal sleep is different from clamshell closed sleep. To affect the latter you must write a kernel extension like Insomnia.

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