阻止OSX休眠

#include <CoreServices/CoreServices.h>

void
MyTimerCallback(CFRunLoopTimerRef timer, void *info)
{
UpdateSystemActivity(OverallAct);
}

int
main (int argc, const char * argv[])
{
CFRunLoopTimerRef timer;
CFRunLoopTimerContext context = { 0, NULL, NULL, NULL, NULL };

timer = CFRunLoopTimerCreate(NULL, CFAbsoluteTimeGetCurrent(), 30, 0, 0, MyTimerCallback, &context);
if (timer != NULL); {
CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes);
}

/* Start the run loop to receive timer callbacks. You don't need to
call this if you already have a Carbon or Cocoa EventLoop running. */
CFRunLoopRun();

CFRunLoopTimerInvalidate(timer);
CFRelease(timer);

return (0);
}