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Values of DOS 2-6.22 file sharing behavior

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First
open

Second and subsequent Opens

Compat

Deny
All

Deny
Write

Deny
Read

Deny
None

R W R
W
R W R
W
R W R
W
R W R
W
R W R
W

Compat

R Y Y Y N N N 1 N N N N N 1 N N
W Y Y Y N N N N N N N N N Y N N
RW Y Y Y N N N N N N N N N Y N N

Deny
All

R C C C N N N N N N N N N N N N
W C C C N N N N N N N N N N N N
RW C C C N N N N N N N N N N N N

Deny
Write

R 2 C C N N N Y N N N N N Y N N
W C C C N N N N N N Y N N Y N N
RW C C C N N N N N N N N N Y N N

Deny
Read

R C C C N N N N Y N N N N N Y N
W C C C N N N N N N N Y N N Y N
RW C C C N N N N N N N N N N Y N

Deny
None

R 2 C C N N N Y Y Y N N N Y Y Y
W C C C N N N N N N Y Y Y Y Y Y
RW C C C N N N N N N N N N Y Y Y

Legend:

Y

=

open succeeds

N

=

open fails with error code 05h

C

=

open fails, INT 24 generated

1 = open succeeds if file read-only, else fails with error code
2 = open succeeds if file read-only, else fails with INT 24

See Also:

#01636,#01404