HelenOS sources

device_event_callback  152 uspace/app/wavplay/dplay.c 	    device_event_callback, pb);
device_event_callback  146 uspace/app/wavplay/drec.c 	    device_event_callback, rec);
device_event_callback   55 uspace/srv/audio/hound/audio_device.c static void device_event_callback(ipc_call_t *icall, void *arg);
device_event_callback  169 uspace/srv/audio/hound/audio_device.c 		    device_event_callback, dev);
HelenOS homepage, sources at GitHub