Subj : file modes
To   : Chris Hoppman
From : Jasen Betts
Date : Sun Jul 04 2004 02:02 pm

Hello Chris.

02 Jul 04 23:08, you wrote to all:

 CH> How would you go about setting file modes in tp?

 CH> Like
 CH> fm_deny_read_write;
 CH> fm_allow_read_write;
 CH> filemode := ??

Get yourself a good dos reference like "Ralf Brown's interrupt list"
(inter*.zip)  the TP internals ar closely linked with DOS,

=== Cut ===
the following tables are takes from the above.

Bitfields for access and sharing modes:
Bit(s)  Description (Table 0521)
 2-0    access mode
    000 read only
    001 write only
    010 read/write
    011 (DOS 5+ internal) passed to redirector on EXEC to allow
        case-sensitive filenames
 3  reserved (0)
 6-4    sharing mode (DOS 3+)
    000 compatibility mode
    001 "DENYALL" prohiboth read and write access by others
    010 "DENYWRITE" prohiwrite access by others
    011 "DENYREAD" prohiread access by others
    100 "DENYNONE" allow full access by others
    111 network FCB (only available during server call)
 7  inheritance
    if set, file is private to current process and will not be inherited
      by child processes

(Table 0522)
Values of DOS file sharing behavior:

          | Second and subsequent Opens
 First    |Compat  Deny   Deny   Deny   Deny
 Open     |        All    Write  Read   None
          |R W RW R W RW R W RW R W RW R W RW
 - - - - -| - - - - - - - - - - - - - - - - -
 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  N N N
        RW|Y Y Y  N N N  N N N  N N N  N N N
 - - - - -|
 Deny   R |C C C  N N N  N N N  N N N  N N N
 All    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   R |2 C C  N N N  Y N N  N N N  Y N N
 Write  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   R |C C C  N N N  N Y N  N N N  N Y N
 Read   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   R |2 C C  N N N  Y Y Y  N N N  Y Y Y
 None   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
------------------------------------------------------------------------------- 
Jasen

--- GoldED+/LNX 1.1.4.7
 * Origin:  (3:640/1042)

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