On Sun, 24 Nov 2002, Siim Vahtre wrote:
> Many weeks have passed but problem is still there.
Try the assembly program below and assemble using
nasm lockdos.asm -o lockdos.com
copy lockdos.com and lockdos.asm to the same directory.
Run two DOSEMU instances.
In one of them, run lockdos.
This will let you select how to lock lockdos.asm
In the other one, try
type lockdos.asm
In my experiment, with C: lredir'ed to an ext2 partition,
using option 1 and 3, the "type" refused to read the file.
So file locking works, right? I'm just not sure what I'm missing here.
Bart
org 100h
xor bx, bx
lop:
mov ah, 9
mov dx, string
int 21h
mov ah, 1
int 21h
sub al, '0'
cmp al, 5
jae quit
push ax
or bx, bx
jz dontclose
mov ah, 3eh
int 21h ; close file
dontclose:
pop ax
shl al, 4
or al, 2
mov dx, filename
mov ah, 3dh
int 21h ; open r/w
mov bx, ax
jmp short lop
quit:
ret
string db 13,10,'Enter locking mode: ', 13, 10
db '0: compatibility', 13, 10,
db '1: DENYALL', 13, 10,
db '2: DENYWRITE', 13, 10,
db '3: DENYREAD', 13, 10,
db '4: DENYNONE', 13, 10,
db '5: quit', 13, 10, '$'
filename db 'lockdos.asm', 0
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