How to detect disk eject event on Mac OS X

disk_arbitration_test.c

#include <DiskArbitration/DiskArbitration.h>

void disk_event(DADiskRef disk, void *context)
{
    printf("Disk removed: %s\n", DADiskGetBSDName(disk));
    CFRunLoopStop(CFRunLoopGetCurrent());
}

int main()
{
    DASessionRef session = DASessionCreate(NULL);
    DARegisterDiskDisappearedCallback(session, NULL, disk_event, NULL);
    //DARegisterDiskAppearedCallback(session, kDADiskDescriptionMatchVolumeMountable, got_disk, NULL);
    DASessionScheduleWithRunLoop(session, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
 
    /* Start the run loop. (Don't do this if you already have a running Core Foundation or Cocoa run loop.) */
    SInt32 res = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 10, false);
    printf("%d\n", res);
    switch (res)
    {
        case kCFRunLoopRunStopped:  
        case kCFRunLoopRunFinished: printf("Loop stopped\n"); break;
        case kCFRunLoopRunTimedOut: printf("Loop timed out\n"); break;
    }

    DASessionUnscheduleFromRunLoop(session, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
 
    /* Clean up a session. */
    CFRelease(session);
}