Int 21/AX=4301h

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DOS 2+ - CHMOD - SET FILE ATTRIBUTES

AX = 4301h
CX = new file attributes (see #01420)
DS:DX -> ASCIZ filename

Return:
CF clear if successful AX destroyed CF set on error AX = error code (01h,02h,03h,05h) (see #01680 at AH=59h)

Notes: Will not change volume label or directory attribute bits, but will change the other attribute bits of a directory (the directory bit must be cleared to successfully change the other attributes of a directory, but the directory will not be changed to a normal file as a result). MS-DOS 4.01 reportedly closes the file if it is currently open. For security reasons, the Novell NetWare execute-only bit can never be cleared; the file must be deleted and recreated. Under the FlashTek X-32 DOS extender, the filename pointer is in DS:EDX. DOS 5.0 SHARE will close the file if it is currently open in sharing- compatibility mode, otherwise a sharing violation critical error is generated if the file is currently open. DR DOS 3.41/5.0 will silently ignore attempts to change the 'directory' attribute bit

See Also: AX=4300h - AX=4311h - AX=7143h - INT 2F/AX=110E

Bitfields for file attributes: Bit(s) Description (Table 01420) 7 shareable (Novell NetWare) 7 pending deleted files (Novell DOS, OpenDOS) 6 unused 5 archive 4 directory 3 volume label. Execute-only (Novell NetWare) 2 system 1 hidden 0 read-only

Category: DOS Kernel - Int 21h - D

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