>From cygwin-return-58541-listarch-cygwin=sourceware dot cygnus dot com at cygwin dot >com Thu Sep 26 06:14:14 2002 Return-Path: <cygwin-return-58541-listarch-cygwin=sourceware dot cygnus dot com at cygwin dot com> Delivered-To: listarch-cygwin at sourceware dot cygnus dot com Received: (qmail 12794 invoked by alias); 26 Sep 2002 06:14:13 -0000 Mailing-List: contact cygwin-help at cygwin dot com; run by ezmlm Precedence: bulk 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 dot redhat dot 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 Received: (qmail 12787 invoked from network); 26 Sep 2002 06:14:12 -0000 Received: from unknown (HELO mail.bluesguitar.org) (216.80.83.62) by sources dot redhat dot com with SMTP; 26 Sep 2002 06:14:12 -0000 Received: from guinness (guinness.bluesguitar.org [172.16.10.1]) by mail dot bluesguitar dot org (Postfix) with SMTP id D1429D90027; Thu, 26 Sep 2002 01:14:11 -0500 (CDT) Message-ID: <[EMAIL PROTECTED]> From: "Matthew Smith" <matts at bluesguitar dot org> To: "Cygwin" <cygwin at sources dot redhat dot com> Cc: "Textutils" <bug-textutils at gnu dot org> References: <[EMAIL PROTECTED]> Subject: Re: tail -f will not work with IIS generated log files Date: Thu, 26 Sep 2002 01:14:11 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
Hi, picking up on something really old: http://www.cygwin.com/ml/cygwin/2002-09/msg01290.html >> Bit of bummer because getting "tail" to monitor IIS was the VERY reason I >> downloaded and installed www.CyGWin.com . I'm wondering: >> >> 1) When might someone fix this? > >It will get fixed as soon as you submit a patch for it! Seriously. All of >the cygwin people work on a volunteer basis. We all have lives/jobs to >contend with, and contribute to cygwin when we can. If you have a feature >you must have, implement it. It's that simple. > >>(extend "tail" to deal with the IIS log >> tricks, and thus making a more powerful "tail") tail doesn't display so is >> surely stripping out pre-allocated buffer space at the end (perhaps because, >> in MS-DOS, it's preceded by a ^Z), but not going back to see if that space >> it skipped has changed, or just not noticing any changes because , as Robert >> suggested, it's probably just looking at the size of the file. What it >> probably should be looking at first is the mod-date, and when that changes, >> continue outputting it's output at the point where it found no more valid >> text, NOT necessarily the end of the file. This minor redesign could then >> be folded back into the Gnu sources, for a more powerful tail for everyone. > >I agree, it sounds simple. I eagerly await your changes. > >cheers, >-Matt Smith >cygwin textutils maintainer I just faced the same problem and didn't find a solution digging through the list and the net. I had a look at modifying tail.c but couldn't grasp it this morning. So I came up with this not exactly pretty perl solution: use strict; my ($pos,$file); $file = $ARGV[0]; open(FH,$file) || die "$file: $!"; seek( FH, -70000, 2 ) || die; # goto eof -70000 bytes while(1) { while(<FH>) { last if /\x00+/; print "$_"; $pos = tell( FH ); } close( FH ); sleep 1; open(FH,$file) || die; seek( FH, $pos, 0 ); } It doesn't work without the close/open pair, sigh. And it doesn't count lines. Maybe someone more familiar with the tail source can port this to tail.c? As a side note: checking modification dates is useless, they only change when IIS allocates a new chunk of zeroes. Michael -- 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/
