INT 21 - MS-DOS 7.0+ - GENERIC IOCTL - GET CURRENT LOCK STATE AX = 440Dh CX = 0870h / 4870h (category code 08h for FAT12/16, 48h for FAT32; minor code 70h) BL = drive number (00h=default,01h=A:,etc) Return: CF set on error AX = error code (01h,02h,etc.) (see #01680 at AH=59h/BX=0000h) CF clear if successful AX = current lock level (0-3) or FFFFh if not locked CX = lock permissions if AX<>FFFFh (see #01575) SeeAlso: AX=440Dh"DOS 3.2+",AX=440Dh/CX=086Ch