Category: DOS kernel
INT 21 - 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 SeeAlso: AX=4300h,AX=4311h,AX=7143h,INT 2F/AX=110Eh