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From:	"Robert Collins" <robert DOT collins AT syncretize DOT net>
To:	"'Ralf Habacker'" <Ralf DOT Habacker AT freenet DOT de>,
	"'Nicholas Wourms'" <nwourms AT yahoo DOT com>, <cygwin AT cygwin DOT com>
Cc:	<cwilson AT ece DOT gatech DOT edu>
Subject:	RE: SysV Ipc shm revisited...A new solution
Date:	Sat, 8 Jun 2002 08:29:24 +1000
Message-ID:	<002101c20e72$c78f40b0$0200a8c0@lifelesswks>
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> -----Original Message-----
> From: Ralf Habacker [mailto:Ralf DOT Habacker AT freenet DOT de] 
> Sent: Saturday, 8 June 2002 5:19 AM
> To: Robert Collins; 'Nicholas Wourms'; cygwin AT cygwin DOT com
> Cc: cwilson AT ece DOT gatech DOT edu
> Subject: RE: SysV Ipc shm revisited...A new solution
> 
> 
> >Robert Collins wrote:
> 
> > Already provided. What will happen when the 64 bit key is 
> exported is
> > that fresh cygipc linked programs will fail, but existing 
> programs will
> > still work correctly. If something like ipcdaemon2.exe exists - OR -
> > cygipc is re-released as a 64-bit version, then new links 
> will succeed
> > (but at the possible cost of breaking old binaries).
> >
> Why must this be ? Could not the released 64-bit version only 
> use the most
> significant long word of key_t, so that it is compatible to 
> the old binaries and
> can use the 64 bit key_t definition ?

It wouldn't be compatible with the old binaries because the signature
would still be wrong, and this would lead to immediate crashes when it
tried to pop to much off the stack.

Rob


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