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Date: Sun, 10 Jul 2005 23:58:25 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Yu-Cheng Chou <cycchou AT ucdavis DOT edu>
cc: cygwin AT cygwin DOT com
Subject: Re: How to add 4K of scratch space at the bottom of the stack using  C instead of C++?
In-Reply-To: <200507110327.j6B3RTaL026133@celerio.ucdavis.edu>
Message-ID: <Pine.GSO.4.61.0507102347540.9496@slinky.cs.nyu.edu>
References: <200507110327 DOT j6B3RTaL026133 AT celerio DOT ucdavis DOT edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Sun, 10 Jul 2005, Yu-Cheng Chou wrote:

> Hi,
> In order to dynamically load cygwin1.dll with VC, I need to add 4K of
> scratch space at the bottom of my stack.
>
> The winsup/testsuite/cygload/cygload.cpp shows how to do it using C++.

I believe it's cygload.cc...

> How can I add the scratch space using C rather than C++ in a simplest
> way?

I'm afraid it won't be very simple, but how about something like

int main(int ac, char *av[]) {
    char padding[4096];
    backup_lower_stack();

    ...

    restore_lower_stack();
    return ...
}

with backup_lower_stack() and restore_lower_stack() adapted from the
cygwin::padding constructor and destructor, respectively (the vector can
be replaced by a malloc'ed piece of memory).

However, you'll also need to write a C interface to cygwin::connector.
Once you have this working, I would strongly urge you to submit the code
to Cygwin.
HTH,
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

If there's any real truth it's that the entire multidimensional infinity
of the Universe is almost certainly being run by a bunch of maniacs. /DA

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