From owner-freebsd-questions@FreeBSD.ORG  Sun Jul  2 02:37:26 2006
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 3539116A55B
	for <freebsd-questions@freebsd.org>;
	Sun,  2 Jul 2006 02:37:26 +0000 (UTC)
	(envelope-from lists@jnielsen.net)
Received: from ns1.jnielsen.net (ns1.jnielsen.net [69.55.238.237])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 2467544C3B
	for <freebsd-questions@freebsd.org>;
	Sun,  2 Jul 2006 02:14:49 +0000 (GMT)
	(envelope-from lists@jnielsen.net)
Received: from c-68-59-28-54.hsd1.sc.comcast.net
	(jn@c-68-59-28-54.hsd1.sc.comcast.net [68.59.28.54])
	(authenticated bits=0)
	by ns1.jnielsen.net (8.12.9p2/8.12.9) with ESMTP id k622ElER046366;
	Sat, 1 Jul 2006 19:14:48 -0700 (PDT)
	(envelope-from lists@jnielsen.net)
From: John Nielsen <lists@jnielsen.net>
To: freebsd-questions@freebsd.org, sigsegv@radiotube.org
Date: Sat, 1 Jul 2006 22:14:46 -0400
User-Agent: KMail/1.9.3
References: <200606301737.32015.rainer.heesen@gmx.de>
	<44A6A3D5.9020607@radiotube.org> <44A6A58F.7090602@radiotube.org>
In-Reply-To: <44A6A58F.7090602@radiotube.org>
X-Face: #X5#Y*q>F:]zT!DegL3z5Xo'^MN[$8k\[4^3rN~wm=s=Uw(sW}R?3b^*f1Wu*.<=?utf-8?q?of=5F4NrS=0A=09P*M/9CpxDo!D6?=)IY1w<9B1jB;
	tBQf[RU-R<,I)e"$q7N7
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200607012214.47054.lists@jnielsen.net>
X-Virus-Scanned: ClamAV version 0.88.2,
	clamav-milter version 0.88.2 on ns1.jnielsen.net
X-Virus-Status: Clean
Cc: 
Subject: Re: CUPS, USB printers & "Permission Denied"
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 02 Jul 2006 02:37:26 -0000

On Saturday 01 July 2006 12:40, Jan-Espen Pettersen wrote:
> > The problem is that read operations on usb printers might just
> > block/hang with no data from the printer (?). ulpt doesn't have
> > non-blocking I/O, so I've made a patch that simply times out read
> > operations, and disables further reads if it detects a blocking/stall
> > condition. It is possible that this breaks the back-channel, as I'm
> > unsure if we can expect a printer to send inbound data before we
> > actually write anything out?
> >
> > It looks like there are similar problems with other backends? I've only
> > looked at the usb backend yet.
>
> Sorry, the attachment got cleared by mailman.
> http://www.radiotube.org/patch-backend_usb-unix.c
>
> Put it into /usr/ports/print/cups-base/files if you would like to test
> it.

That works for me with my USB Lexmark E210. (The file:/ URI workaround also 
works).

Thanks!  Are you coordinating anything with the cups project or the port 
maintainer to explore this issue?

JN