Int 21/AX=440Dh/CX=086Ch

MS-DOS 7.0+ - GENERIC IOCTL - GET LOCK FLAG STATE

AX = 440Dh
CX = 086Ch / 486Ch
(category code 08h for FAT12/16, 48h for FAT32; minor code 6Ch)
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 = access flag (see #01576)

See Also: AX=440Dh/CX=0870h

(Table 01576) Values for drive access flag: 0000h no writes/file mappings since last call 0001h write operation has occurred since last call 0002h file mapping has occurred since last call

Note: Function 6Ch resets the access flag every time it is called

Category: DOS Kernel - Int 21h - M

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