DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:mime-version:in-reply-to:references:date
	:message-id:subject:from:to:content-type; q=dns; s=default; b=nu
	BTrYb6g7mGhA/J2vyiLMg0bQ27bYEMMNM/Rf+djUM6DYjlUzQoSmTqHopM6OYWfi
	w7I5j/NH83mQvrGFzvVGJwTyepPEa0MvJJz2LqKPmX2jnBAgY3+2jj/wwftsKmiD
	qhLcsQ9+m05xYAoKKgbP+GZQdv4RQ0SpEpLUITPzU=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
MIME-Version: 1.0
In-Reply-To: <20130822171419.GQ2562@calimero.vinschen.de>
References: <52162CA9.9080002@etr-usa.com>	<20130822171419.GQ2562@calimero.vinschen.de>
Date: Thu, 22 Aug 2013 16:46:51 -0400
Message-ID: <CA+sc5mnedD0hOfzwTWYzy0QVhKC9gg-C68Nxfska-HG0HFOpLQ@mail.gmail.com>
Subject: Re: Why are the 32- and 64-bit cygwin1.dlls incompatible?
From: Earnie Boyd <earnie@users.sourceforge.net>
To: Andrey Repin <cygwin@cygwin.com>
Content-Type: text/plain; charset=UTF-8

On Thu, Aug 22, 2013 at 1:14 PM, Corinna Vinschen wrote:
>
> When execveing a Cygwin process, a lot of data is submitted via shared
> memory, via data copying, and via a special parameter to the
> CreateProcess call with the mysterious name "lpReserved2".
>
> One problem is the differences in basic datatypes, which results in
> incompatible datastructures between 32 and 64 bit.  While this could be
> worked around, this doesn't help for the shared memory stuff, which
> depends on the installation path of the cygwin DLL.  The Cygwin DLL in
> C:\cygwin1 would use a different name for the shared mem regions than
> the Cygwin DLL installed into C:\cygwin2, independent of the target
> architecture.  This is by design since Cygwin 1.7.  One effect:  No tty
> sharing.
>

Since you know that the DLL regions are different what about execing
the process as if it were a windows native process?  I know you loose
the ability to do the parent/child relationship but it isn't any worse
than spawning a native process.

-- 
Earnie
-- https://sites.google.com/site/earnieboyd

--
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