X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-2.3 required=5.0	tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,T_TO_NO_BRKTS_FREEMAIL
X-Spam-Check-By: sourceware.org
MIME-Version: 1.0
In-Reply-To: <AANLkTikJmOf7hrrXGveCPtjZanYXCd8VDnUdfNkBPiKM@mail.gmail.com>
References: <AANLkTim2j17e_BiNicdwqyeSaGxxm7Ok6OX5oXpvbNGA AT mail DOT gmail DOT com>	<AANLkTikJmOf7hrrXGveCPtjZanYXCd8VDnUdfNkBPiKM AT mail DOT gmail DOT com>
Date: Wed, 8 Dec 2010 22:20:26 +0100
Message-ID: <AANLkTiki8sb6O1U5doBibT1sw7y-7NLP812RzppF7MhQ@mail.gmail.com>
Subject: Re: Loading a Cygwin based DLL and calling exported functions
From: Reini Urban <rurban AT x-ray DOT at>
To: cygwin AT cygwin DOT com
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

2010/12/8 James Dickson:
> VC++ 10.0 client application:
>
> int main(int argc, char ** argv)
> {
> =A0=A0 =A0// 4k scratch space.
> =A0=A0 =A0char *stackbase;
> =A0=A0 =A0__asm
> =A0=A0 =A0{
> =A0=A0 =A0 =A0 =A0mov eax, fs:[4];
> =A0=A0 =A0 =A0 =A0mov stackbase, eax;
> =A0=A0 =A0}
>
> =A0=A0 =A0// Load cygwin dll.
> =A0=A0 =A0HMODULE cygwin_ptr =3D LoadLibrary(L"cygwin1.dll");

That's a 4byte scratch space on the stack for the char*, and not 4K.

char stackbase[4096]; would fit (untested), but using the padding
method from cygload even better.
--=20
Reini Urban

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple