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Date: Wed, 24 Oct 2001 13:17:34 -0500
From: "William A. Gatliff" <bgat AT saturn DOT billgatliff DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [1.3.3] breaks serial i/o?
Message-ID: <20011024131734.B20267@saturn.billgatliff.com>
Reply-To: bgat AT billgatliff DOT com
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In-Reply-To: <20011023115734.A22115@redhat.com>; from cgf@redhat.com on Tue, Oct 23, 2001 at 11:57:34AM -0400

Chris:

Not yet.  I got back into the office late last night.

b.g.

On Tue, Oct 23, 2001 at 11:57:34AM -0400, Christopher Faylor wrote:
> Any updates on this?
> 
> cgf
> 
> On Sun, Oct 21, 2001 at 12:39:13AM -0400, Christopher Faylor wrote:
> >On Sun, Oct 21, 2001 at 12:30:44AM -0400, Christopher Faylor wrote:
> >>On Sat, Oct 20, 2001 at 10:39:34PM -0400, Christopher Faylor wrote:
> >>>However, before we reach this drastic step, I'd *really* suggest at
> >>>least trying the 5.1 branch of gdb.  Your errors sound very similar
> >>>to others that were reported with ARM.  It is very possible that
> >>>they were fixed subsequent to 5.0.
> >>
> >>I have just spelunked through the cvs logs in the rdi-share directory
> >>and it looks like most relevant changes to gdb for arm/rdi did make
> >>it into gdb 5.0 so this probably is not going to hold out much promise.
> >>
> >>>From looking at gdb's code it seems like select is returning a TRUE
> >>for something to select on the serial line but when it is time to
> >>read something, apparently nothing is available.
> >>
> >>I guess I really will have to make a cable and connect my linux and
> >>windows systems to test this...
> >
> >One suggestion for the gdb code -- add an '| O_BINARY' to all of the
> >opens of the serial line in unixcomm.c.  I can see a pathological
> >condition in cygwin where a VMIN setting will not be properly honored if
> >there is a readahead condition due to a '\n' -> '\r\n' conversion.
> >
> >This could cause the code to block but even if it wasn't blocking, I
> >assume that you probably don't want to do newline conversions.
> >
> >This probably isn't going to fix the problem since the default is for
> >cygwin to not do this kind of conversion on devices but it's best to be
> >safe anyway.
> >
> >cgf
> >
> >--
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> 
> -- 
> cgf AT cygnus DOT com                        Red Hat, Inc.
> http://sources.redhat.com/            http://www.redhat.com/
> 

-- 
Bill Gatliff
bgat AT billgatliff DOT com

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