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// brightnessd — display brightness daemon for bar
//
// Uses IOKit to listen for display brightness changes and posts
// a Darwin notification.
//
// Compile:
// cc -o bar-brightnessd daemons/brightnessd.c \
// -framework IOKit -framework CoreFoundation
#include <IOKit/IOKitLib.h>
#include <IOKit/graphics/IOGraphicsLib.h>
#include <notify.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static volatile int keep_running = 1;
static IONotificationPortRef notifyPort = NULL;
static void handle_signal(int sig) {
(void)sig;
keep_running = 0;
}
static void brightness_changed(void *refcon, io_iterator_t iterator) {
(void)refcon;
// Drain the iterator
io_object_t obj;
while ((obj = IOIteratorNext(iterator))) {
IOObjectRelease(obj);
}
notify_post("bar.touch.<block-name>");
}
int main(void) {
signal(SIGINT, handle_signal);
signal(SIGTERM, handle_signal);
notifyPort = IONotificationPortCreate(kIOMasterPortDefault);
CFRunLoopSourceRef source = IONotificationPortGetRunLoopSource(notifyPort);
CFRunLoopAddSource(CFRunLoopGetCurrent(), source, kCFRunLoopDefaultMode);
// Watch for brightness-related display changes
CFMutableDictionaryRef matching = IOServiceMatching("AppleBacklightDisplay");
if (!matching) {
// Fallback: try Intel backlight
matching = IOServiceMatching("AppleIntelPanel");
}
if (!matching) {
matching = IOServiceMatching("IODisplay");
}
if (matching) {
io_iterator_t iter;
IOServiceAddMatchingNotification(
notifyPort, kIOFirstMatchNotification, matching,
brightness_changed, NULL, &iter);
brightness_changed(NULL, iter); // drain initial
// Also watch for termination to catch display disconnect
IOServiceAddMatchingNotification(
notifyPort, kIOTerminatedNotification, matching,
brightness_changed, NULL, &iter);
}
while (keep_running) {
pause();
}
if (notifyPort) {
IONotificationPortDestroy(notifyPort);
}
return 0;
}
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