Xref:	news2.mv.net comp.os.msdos.djgpp:5873
From:	Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: How much stack left?
Date:	Thu, 11 Jul 1996 08:12:22 CDT
Organization:	Rice University, Houston, Texas
Lines:	21
Message-ID:	<31e4fdb6.sandmann@clio.rice.edu>
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 960710132041 DOT 4676B-100000 AT is>
Reply-To:	sandmann AT clio DOT rice DOT edu
NNTP-Posting-Host:	clio.rice.edu
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

> > In V2, how can I find at run time how much free stack space is left?
> You can get the address of the farthest (lowest) location of the stack (by
> calling `alloca (256K)' at the beginning of `main') and then look at the

I don't think this will work - and will probably overrun the stack with
bad consequences.

In general, finding out the base of the stack is a very difficult task 
in V2, especially since a DPMI provider may chose to give it to you at
a non-contiguous point.  In general, it's usually at (see <stubinfo.h>)
_stubinfo + sizeof(_GO32_StubInfo).

You can also check this plus the stklen variable, get the size, and
subtract from the current %esp via an asm() block.  If this value is
far from the stubinfo value above, it's probably in a different memory
zone.

It probably ought to just be a variable, as someone sent a patch for.
I have an ugly routine someplace which determines the amount of 
stack used so far (and also how much is left) - I probably ought to
just package them up.

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