SG_EMULATED_HOST 0x2203.  Assumes 3rd argument points to an int and outputs a flag indicating whether the host (adapter) is connected to a "real" SCSI bus or is an emulated one (e.g. ide-scsi or usb storage device driver). A value of 1 means emulated while 0 is not. [To check: is IEEE1394 a "real" SCSI serial bus?]