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Date: Thu, 3 Apr 2003 23:56:53 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Big Brother is Real
Message-ID: <20030403215653.GX18138@cygbert.vinschen.de>
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References: <BF653A78FF4ED0468924C8721AC5EAE7026D2C82 AT df-muttley DOT dogfood> <20030403213726 DOT GC18494 AT redhat DOT com> <20030403214739 DOT GW18138 AT cygbert DOT vinschen DOT de> <20030403214943 DOT GA18771 AT redhat DOT com>
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On Thu, Apr 03, 2003 at 04:49:43PM -0500, Christopher Faylor wrote:
> On Thu, Apr 03, 2003 at 11:47:39PM +0200, Corinna Vinschen wrote:
> >I got a hint lately about stuff working different on 64bit.  If a 32 bit
> >application is called from a 64 bit application the stack is 0xc000
> >lower than if the same 32 bit application is called by another 32 bit
> >application.  E. g., the first bash is spawned from 64 bit cmd.exe, its
> >stack is shifted 0xc000.  A CreateProcess call from fork will now create
> >a child with the stack at another location which breaks the longjmp.
> 
> That shouldn't be a problem.  That's no different than if fork() is
> called from another thread.  The stack should be relocated in the forkee
> automatically unless the memory for the stack is being used for something
> else.

Hmm, this was apparently the reason it didn't work.  The guy tracked it
down to the longjmp which SEGV'd since it tried to return to an invalid
memory region.  But anyway, fork is your child.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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