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How can I create process permanent file (like DCL does) from an application executable (I happen to be coding in Fortran, but I suspect that's not important to the answer).

I would like to create/open the file in one EXE, then be able to access it from DCL or another EXE in the same procedure.

I have a general understanding of RMS internals, so answers with FAB or RAB structures will probably be understood. As a guess, SUPERVISOR mode is involved.

Mark Diaz
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1 Answers1

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Asked and answered. :-).

Note 870.1    How do you open process permanent files and channels        1 of 5
QUARK::LIONEL "Ad Astra"                              5 lines   1-JAN-1989 00:15
                          < PPFs only through CLIs >
--------------------------------------------------------------------------------

For question 1, the ONLY way to create a PPF is through a CLI such
as DCL.  The usual method is the DCL OPEN command.  From languages,
you can only open existing PPFs.

Nothing has changed since.

PPF are very restrictive ( minimal buffers, no global buffers, ...) and should be created BEFORE with DCL before a program tries to use it.

What problem are you really trying to solve?

Hein

Hein
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  • fwiw, you can probably use CMEXEC, descend to SUPER and flip the FAB$V_PPF bit in FAB$L_FOP – Hein Nov 02 '17 at 00:43
  • I don't have a need at the moment (Thanks for re-posting the previous answer). I remember where this would have been handy in the past and wanted to add it to my bag of tricks. I'll experiment with the CMEXEC, etc. and report back if I get that to work. – Mark Diaz Nov 02 '17 at 21:46
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    Ah, the memories of VAX NOTES at DEC. – user3344003 Nov 08 '17 at 18:20