/* Not yet done, because I haven't needed it. */

  int ret;

  struct usb_ctl_request ctl_req;

  USB_ERROR_STR(-ENOSYS, "usb_clear_halt called, unimplemented on BSD");

  ctl_req.ucr_addr = 0; // Not used for this type of request

  ctl_req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;

  ctl_req.ucr_request.bRequest = UR_CLEAR_FEATURE;

  USETW(ctl_req.ucr_request.wValue, UF_ENDPOINT_HALT);

  USETW(ctl_req.ucr_request.wIndex, ep);

  USETW(ctl_req.ucr_request.wLength, 0);

  ctl_req.ucr_flags = 0;

  if ((ret = ioctl(dev->fd, USB_DO_REQUEST, &ctl_req)) < 0)

      USB_ERROR_STR(-errno, "clear_halt:  failed for %d", ep);

       return ret;