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From: jamescb@sco.UUCP (James Bohem)
Newsgroups: comp.unix.xenix
Subject: Re: GKS, INFORMIX on SCO XENIX
Message-ID: <180@sco>
Date: Wed, 1-Jul-87 21:40:52 EDT
Article-I.D.: sco.180
Posted: Wed Jul  1 21:40:52 1987
Date-Received: Sat, 4-Jul-87 05:17:23 EDT
References: <241@bvax.UUCP> <1043@killer.UUCP>
Reply-To: jamescb@sco.UUCP (James C. Bohem)
Organization: SCO, Santa Cruz CA
Lines: 25
Keywords: GKS, INFORMIX, C-ISAM

In article <1043@killer.UUCP> jfh@killer.UUCP (John Haugh) writes:
>In article <241@bvax.UUCP>, rich@bvax.UUCP (Rich Chahley) writes:
>> We also ran into a mitful of problems when GKS, INFORMIX C-ISAM is linked 
>> together with our application software developed in-house.  The problem is
>> with the stack space for the "near data segment" in XENIX.  Apparantly the
>> near data segment includes the uninitialized data and string constants and
>> cannot exceed 64k.
>> :::
>
>This used to be a problem with PDP-11's.  The entire program can only be
>64K period.  (Unless you use separate I&D)  Some programs would move some
::: etc.
Not quite the same on an Intel 80286 (please no segmented architecture
flames, I hate it too): In this case, Informix is a medium model program
(1 64K data segment, multiple text segments); The 64K limitation is small
model on the 8086/80286, just like PDP's, and just like PDP's, the -i
option to cc will give you 64K of each text and data. Informix, and its 
libraries for C program development still have a data space limitation
of 64K, but not a text limitation. Note that on the 286 you can use 
the brkctl() call to allocate > 64K using **far** pointers (but
be reeeal careful). This helps with overall data requirements but NOT
with initialised data. But by making most of your data access a far segment,
you can hopefully find space in the first data segment for the initialised
data. Remember that your stack comes out of that first data segment too,
so leave room for it.