Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sources.redhat.com/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/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
X-Authentication-Warning:	eos.vss.fsi.com: ford owned process doing -bs
Date:	Tue, 9 Dec 2003 14:55:58 -0600 (CST)
From:	Brian Ford <ford AT vss DOT fsi DOT com>
X-X-Sender:	ford AT eos
To:	Jeff Gilchrist <jsgilchrist AT hotmail DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: 1.5.5-1: problem with read() on Athlon MP in WinXP
In-Reply-To:	<BAY2-F93inmuoQLeGpC0001aaaa@hotmail.com>
Message-ID:	<Pine.GSO.4.58.0312091438540.28297@eos>
References:	<BAY2-F93inmuoQLeGpC0001aaaa AT hotmail DOT com>
MIME-Version:	1.0
Note-from-DJ:	This may be spam

Please don't include plain text email addresses in the body of messages.
It is food for spam harvesters.  Thanks.

On Tue, 9 Dec 2003, Jeff Gilchrist wrote:
> Brian Ford wrote:
> >It sounds like you may have two problems here, but this may be the first
> >one:
> >
> >http://cygwin.com/cygwin-ug-net/using-textbinary.html
> >
> Well don't I feel like a newbie.  That was the problem.  I was reading in
> binary data and forgot to add the O_BINARY flag to open().  As soon as I did
> that, it worked fine on my Athlon system.
>
> Not sure why it did work on the other two machines but I guess that was just
> a fluke. :)  I posted the test.c as the minimal amount of code out of a
> larger program that I had written where I was having the problems.  The same
> code that doesn't work under cygwin on my Athlon was running fine under
> Linux on the same Althlon and Solaris on a Sparc too so I never suspected
> something simple as leaving out a O_BINARY.
>
> Since my code did work fine under Linux and Solaris, is this an artifact of
> cygwin having the option to treat files in "DOS" or "Unix" format by
> default?  Or is this an actual bug in how cygwin handles binary data if the
> "BINARY" flag isn't set?  I converted my code to use fopen()/fread() instead
> and still had the same problem if I didn't speciy the "b" flag.
>
Bingo!

Cygwin doesn't know the difference between text and binary data.  It uses
one of open(O_BINARY), CYGWIN=[no]binmode, and "mount -b" to determine how
to treat a file.

Check the output of mount on the systems with differing behavior.  I'd bet
you selected a default mode of UNIX on the working systems and DOS on the
Athlon.

> Thanks, this solves my problem and your answer is much appreciated.
>
You're welcome.

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
Phone: 314-551-8460
Fax:   314-551-8444

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

- Raw text -