RE: Hooking display file I/O

[Don <dr2@xxxxxxxxxxxx>]

Heck, Joe,

My guess is that if it's missing form the book and needed, Leif'll just
add another chapter....:)

Don



On Sun, 5 Aug 2001, Joe Pluta wrote:

> It is not Greek to me, Leif.  It is not entirely clear, but I've written
> operating systems before, so I'm comfortable with the concepts of system
> pointer tables (and the dangers of modifying them!).  I don't know how to
> access the PCO, nor what is in it, but if there's a manual describing it,
> I'm sure I can learn.
> 
> I have a basic understanding of the OS/400 implementation of pointers and
> tag bits.  I have not used them yet.  The same holds true for MI.  As you
> know, I purchased your book, and if it turns out that this project is
> feasible, I will devote my free time to going through it.  Is your book
> enough to give me a working knowledge of the pieces I will need?  If not, is
> it a good starting point?  And what else will I need to learn?
> 
> Joe
> 
> 
> > -----Original Message-----
> > From: owner-mi400@midrange.com [mailto:owner-mi400@midrange.com]On
> > Behalf Of Leif Svalgaard
> > Sent: Sunday, August 05, 2001 11:43 AM
> > To: MI400@midrange.com
> > Subject: Re: Hooking display file I/O
> >
> >
> >
> > ----- 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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