X-Recipient: archive-cygwin AT delorie DOT com X-Original-To: cygwin AT cygwin DOT com Delivered-To: cygwin AT cygwin DOT com DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org E04BA39AF414 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=optusnet.com.au Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=dimstar.local.net Date: Sat, 12 Jun 2021 11:32:19 +1000 From: Duncan Roe To: "cygwin AT cygwin DOT com" Subject: Re: odd prob for cygwin 'dd' from a character device on network disk Message-ID: <20210612013219.GC14223@dimstar.local.net> Mail-Followup-To: "cygwin AT cygwin DOT com" References: <60C168AF DOT 4070400 AT tlinx DOT org> <20210610022303 DOT GA14223 AT dimstar DOT local DOT net> <60C2D67E DOT 3030407 AT tlinx DOT org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <60C2D67E.3030407@tlinx.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.3 cv=Tu+Yewfh c=1 sm=1 tr=0 a=r+VM+2qIvekI+VMePCMXTA==:117 a=r+VM+2qIvekI+VMePCMXTA==:17 a=kj9zAlcOel0A:10 a=r6YtysWOX24A:10 a=RSmzAf-M6YYA:10 a=O0FjA1KwLvPXi2hp_foA:9 a=CjuIK1q_8ugA:10 X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_05, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_LOW, SPF_FAIL, SPF_HELO_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com Sender: "Cygwin" On Thu, Jun 10, 2021 at 08:20:30PM -0700, L A Walsh wrote: > On 2021/06/09 19:23, Duncan Roe wrote: > > > > > nfs / nodev? > > > I'm not sure what you mean or are asking. > I'm not using nfs...but cygwin. > > The file 'zero' is in the same dir as the file 'null'. > I usually read 'zero' and write to 'null, though > for 1-way testing, I read from file 'zero' on the remote > file system and write, locally to /dev/null. > > For other direction write to 'null' and read from > /dev/zero locally. > > When you said you were accessing zero over the network, you didn't say how so I suggested if you were using nfs then nodev might be the culprit. How are you accessing files aver the network? I suspect that whatever mechanism you are using has the equivalent of the nfs nodev feature (part of nfsmount, may be specified in fstab) and the nodev equivalent is turned on in your case. -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple