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From: "Craig A. Berry" <craigberry@nospam.mac.com>
Newsgroups: comp.os.vms
Subject: Re: sys$ssio_*
Date: Wed, 27 Nov 2024 07:19:21 -0600
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On 11/26/24 2:53 PM, Arne Vajhøj wrote:
> They are there in 9.2-2. Sort of.
> 
> They are in various starlet include/inherit files and no link error.
> 
> But when I try to call I get 4026:
> 
> %SYSTEM-E-NOT_LOADED, system service or exec routine is not loaded
> 
> What to do to load them?

Dunno, but those are probably the routines within the XFC intended to be
called by the CRTL, so unless you are trying to implement your own CRTL
you may not get what you want by calling them directly.

To enable SSIO in the CRTL, you had to set DECC$SSIO and
DECC$FILE_SHARING in the environment or send fop="ssio", shr="upd" to
open() or creat(). This according to notes distributed with the beta
twelve years ago.

Given that SSIO was left incomplete for a decade, followed by a brief
period where it was on the roadmap and Andy Goldstein was reportedly
working on it, followed by removal from the roadmap, it's anybody's
guess what's actually there and whether any of it even still partially 
works.