Message-ID:	<339DC0FC.11C8@cs.com>
Date:	Tue, 10 Jun 1997 21:02:52 +0000
From:	"John M. Aldrich" <fighteer AT cs DOT com>
Reply-To:	fighteer AT cs DOT com
Organization:	Two pounds of chaos and a pinch of salt
MIME-Version:	1.0
To:	DJGPP Workers Mailing List <djgpp-workers AT delorie DOT com>
Subject:	Re: Latest stub
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 970610111123 DOT 3067N-100000 AT is>

Eli Zaretskii wrote:
> 
> > stub failed to load.  I made a trivial modification to stub.asm to make
> > it return a unique code in the 100-110 range corresponding to each
> > possible error message that it could emit, thus allowing the batch file
> > to read this code and and display an appropriate diagnostic message.
> > Currently the stub exits with code 255 for all errors.
> 
> I thought this is already in the v2.01 stub.  Did I miss something?

The current stub does not have unique return codes for each possible
error state - I just checked.  I can post a patch to make it do so, but
that would raise the question of which version of the stub to base the
patch on.  ;)  When v2.01 came out, I discarded the v2.00 stub that I
had modified for DJVERIFY and applied the changes to the new one, so
it's a simple diff to generate.

I would like to see agreement on the error codes to use, first.  I am
all too aware of how a trivial change now can prove disastrous in the
future when it interacts or interferes with some program that assumes
things.  Is there any possibility that a program might try to return
error codes in the 100-110 range for some purpose, and is it worth
worrying about it for such a slim chance?

FYI, here are the codes I had been using; as of now, changing them is
trivial.  It becomes less so when the new stub is actually released. 
The numbers were arbitrarily assigned based on the order in which the
error states are found in the stub.  There are really only nine
messages; the first two are unused for historical reasons.

100	Not used.
101	Not used.
102 	<file>:  Cannot open.
103	<file>:  Not EXE.
104 	<file>:  Not COFF.
105	Load error:  No DOS memory.
106	Load error:  Can't switch modes.
107	Load error:  No DPMI selectors.
108	Load error:  No DPMI memory.
109	Load error:  Need DOS 3.
110	Load error:  No DPMI.

Comments?  Suggestions?

-- 
---------------------------------------------------------------------
| John M. Aldrich, aka Fighteer I  |     mailto:fighteer AT cs DOT com     |
| Plan:  To find ANYONE willing to |   http://www.cs.com/fighteer   |
| play Descent 2 on DWANGO!        | Tagline: <this space for rent> |
---------------------------------------------------------------------

- Raw text -