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Date:	Fri, 21 Dec 2001 12:20:07 -0500
From:	Christopher Faylor <cgf AT redhat DOT com>
To:	Werner Tuchan <tuwn AT gmx DOT net>
Cc:	Neil Booth <neil AT daikokuya DOT demon DOT co DOT uk>, neil AT gcc DOT gnu DOT org,
	gcc-bugs AT gcc DOT gnu DOT org, gcc-gnats AT gcc DOT gnu DOT org, cygwin AT cygwin DOT com
Subject:	Re: bootstrap/5149: gcc-20011217 reads beyond EOF on cygwin
Message-ID:	<20011221172007.GA14954@redhat.com>
Mail-Followup-To:	Werner Tuchan <tuwn AT gmx DOT net>,
	Neil Booth <neil AT daikokuya DOT demon DOT co DOT uk>, neil AT gcc DOT gnu DOT org,
	gcc-bugs AT gcc DOT gnu DOT org, gcc-gnats AT gcc DOT gnu DOT org, cygwin AT cygwin DOT com
References:	<20011220002004 DOT 23509 DOT qmail AT sources DOT redhat DOT com> <000701c18964$fad2d2e0$fb4d0ed4 AT softron DOT de> <20011220183323 DOT B3065 AT daikokuya DOT demon DOT co DOT uk> <002b01c18a2d$aeb7d850$fb4d0ed4 AT softron DOT de>
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On Fri, Dec 21, 2001 at 03:42:14PM +0100, Werner Tuchan wrote:
>> Weird.  The bytes after EOF are a mixture of NULs and 0xc0.  Is 0xc0
>> of special significance in Windows?  Is your version of cygwin the
>> latest?  I recall some talk about mmap bugs in cygwin.
>
>The cygwin version is pretty recent. Two weeks old or so. The data after EOF
>is only garbage. I've seen different values than 0x0 or 0xc0 in the error
>messages. Windows propably doesn't clear the page before mapping the file
>onto it. There is likely a different behaviour here between Windows ME and
>NT.

Can I ask why we'd be reading beyond EOF?  Is it guaranteed that bytes beyond
EOF will be zero on UNIX?

cgf

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