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    <p>I've found the closest thing I can -- example code from a Firefox bug report last modified in April 2013. The following works, producing a simple CLI program to query the sensor (taken freely from <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=793728#attach_664102">https://bugzilla.mozilla.org/show_bug.cgi?id=793728#attach_664102</a>). The service polled is <code>"AppleLMUController"</code>, which you can then extract relevant information from -- the snippet below creates a <code>serviceObject=IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleLMUController"))</code>, which is then used.</p> <pre><code>// lmutracker.mm // // clang -o lmutracker lmutracker.mm -framework IOKit -framework CoreFoundation #include &lt;mach/mach.h&gt; #import &lt;IOKit/IOKitLib.h&gt; #import &lt;CoreFoundation/CoreFoundation.h&gt; static double updateInterval = 0.1; static io_connect_t dataPort = 0; void updateTimerCallBack(CFRunLoopTimerRef timer, void *info) { kern_return_t kr; uint32_t outputs = 2; uint64_t values[outputs]; kr = IOConnectCallMethod(dataPort, 0, nil, 0, nil, 0, values, &amp;outputs, nil, 0); if (kr == KERN_SUCCESS) { printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b%8lld %8lld", values[0], values[1]); return; } if (kr == kIOReturnBusy) { return; } mach_error("I/O Kit error:", kr); exit(kr); } int main(void) { kern_return_t kr; io_service_t serviceObject; CFRunLoopTimerRef updateTimer; serviceObject = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("AppleLMUController")); if (!serviceObject) { fprintf(stderr, "failed to find ambient light sensors\n"); exit(1); } kr = IOServiceOpen(serviceObject, mach_task_self(), 0, &amp;dataPort); IOObjectRelease(serviceObject); if (kr != KERN_SUCCESS) { mach_error("IOServiceOpen:", kr); exit(kr); } setbuf(stdout, NULL); printf("%8ld %8ld", 0L, 0L); updateTimer = CFRunLoopTimerCreate(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent() + updateInterval, updateInterval, 0, 0, updateTimerCallBack, NULL); CFRunLoopAddTimer(CFRunLoopGetCurrent(), updateTimer, kCFRunLoopDefaultMode); CFRunLoopRun(); exit(0); } </code></pre>
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    1. POHow do you programmatically access the ambient light sensor on Mac OS X 10.5+?
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    1. POHow do you programmatically access the ambient light sensor on Mac OS X 10.5+?
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    1. COI haven't had time to dig into the code, but it looks ike you nailed it.
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