Re: Hooking display file I/O

["Leif Svalgaard" <leif@xxxxxxxx>]

----- Original Message -----
From: Joe Pluta <joepluta@PlutaBrothers.com>
To: <MI400@midrange.com>
Sent: Sunday, August 05, 2001 10:57 AM
Subject: Hooking display file I/O


> One of my CFT (Copious Free Time) projects is going to be looking into
> hooking the SEPT for display file I/O.  Has anybody done something like
> this?  Please recognize that I'm an asbolute neophyte, and haven't a clue.
> Is this project bigger than a breadbox?
>
> Joe
>


The way to do this is to monkey with a local copy of SEPT, instead of with
the global system-wide SEPT. The PCO (Process communication obj)
contains a pointer to the SEPT to be used by this process. Changing
that pointer to point to your own copy (which you make with a single
CPYBWP-instruction) requires you to set the tag bit for the pointer.
SST can do that (the "T" flag). If the above is Greek to you, better not mess
with it. BTW, a coming chapter (42?) of my ebook explores this in some
detail.

Leif



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