HelenOS sources

PTD_RELEASE       142 uspace/srv/hid/display/input.c 	event.type = bpress ? PTD_PRESS : PTD_RELEASE;
PTD_RELEASE       500 uspace/srv/hid/display/seat.c 	if (event->type == PTD_PRESS || event->type == PTD_RELEASE ||
PTD_RELEASE       507 uspace/srv/hid/display/seat.c 		case PTD_RELEASE:
PTD_RELEASE       635 uspace/srv/hid/display/test/display.c 	event.type = PTD_RELEASE;
HelenOS homepage, sources at GitHub