[Info-vax] VMS enhancement suggestion: Add a "read regardless" file open option.

[Dave Froble]

On 11/11/2020 1:16 AM, Hein RMS van den Heuvel wrote:
> On Tuesday, November 10, 2020 at 7:56:11 PM UTC-5, Dave Froble wrote:
>> On 11/10/2020 6:16 PM, Craig A. Berry wrote:
>>>
> :
> :
>> Read about the USEROPEN in a file OPEN statement. Basically (sic) the
>> FAB and RAB (I believe) are populated, then the USEROPEN routine,
>> provided by the programmer, can set or clear FAB and RAB fields, and
>> then do the actual file open.
> :
> :
>> Basic(ally) (sic), it's in there ....
>
> Noop. Sorry. A program doesn't get that far!
> As others indicated, the RRL (read Regardless of Lock) option is RECORD level for your GETs, but RMS will fail the open when the writer did not explicitly grant permission.

I stand corrected, I think.  Could not find anything in the FAB 
definition to bypass locking.

To do this, one would have to use QIO in the useropen routine, not 
something I've ever tried, not sure it would work.  I believe Craig 
mentioned using QIO to access the file, thus bypassing the DLM.

Maybe I should stick to finishing the airplane ....

-- 
David Froble                       Tel: 724-529-0450
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