usbf_get_xfer_status  407 dev/usb/if_cdcef.c 	usbf_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);
usbf_get_xfer_status  152 dev/usb/usbf.h void		 usbf_get_xfer_status(usbf_xfer_handle, usbf_private_handle *,