IO_OBJECT_NULL     22 base/mac/scoped_ioobject.h   explicit ScopedIOObject(IOT object = IO_OBJECT_NULL)
IO_OBJECT_NULL     31 base/mac/scoped_ioobject.h   void reset(IOT object = IO_OBJECT_NULL) {
IO_OBJECT_NULL     61 base/mac/scoped_ioobject.h     object_ = IO_OBJECT_NULL;
IO_OBJECT_NULL   1066 third_party/libusb/src/libusb/os/darwin_usb.c   *usbInterfacep = IO_OBJECT_NULL;
IO_OBJECT_NULL   1142 third_party/libusb/src/libusb/os/darwin_usb.c   io_service_t          usbInterface = IO_OBJECT_NULL;
IO_OBJECT_NULL    103 third_party/libusb/src/libusb/os/darwin_usb.h #if !defined(IO_OBJECT_NULL)