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// devicesd — USB device hotplug daemon for bar
//
// Uses IOKit to listen for USB device connect/disconnect events and
// posts a Darwin notification.
//
// Compile:
// cc -o bar-devicesd daemons/devicesd.c \
// -framework IOKit -framework CoreFoundation
#include <IOKit/IOKitLib.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 device_event(void *refcon, io_iterator_t iterator) {
(void)refcon;
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 USB devices
CFMutableDictionaryRef matching = IOServiceMatching("IOUSBDevice");
if (matching) {
io_iterator_t iter;
IOServiceAddMatchingNotification(
notifyPort, kIOFirstMatchNotification, matching,
device_event, NULL, &iter);
device_event(NULL, iter); // drain initial set
IOServiceAddMatchingNotification(
notifyPort, kIOTerminatedNotification, matching,
device_event, NULL, &iter);
}
// Also watch for Bluetooth devices
CFMutableDictionaryRef btMatching = IOServiceMatching("IOBluetoothHCIController");
if (btMatching) {
io_iterator_t iter;
IOServiceAddMatchingNotification(
notifyPort, kIOFirstMatchNotification, btMatching,
device_event, NULL, &iter);
device_event(NULL, iter);
}
while (keep_running) {
pause();
}
if (notifyPort) {
IONotificationPortDestroy(notifyPort);
}
return 0;
}
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