From owner-freebsd-hackers@FreeBSD.ORG  Mon Jun 16 04:35:23 2003
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 3D80737B401
	for <hackers@freebsd.org>; Mon, 16 Jun 2003 04:35:23 -0700 (PDT)
Received: from stork.mail.pas.earthlink.net (stork.mail.pas.earthlink.net
	[207.217.120.188])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 9850543F85
	for <hackers@freebsd.org>; Mon, 16 Jun 2003 04:35:22 -0700 (PDT)
	(envelope-from tlambert2@mindspring.com)
Received: from user-2ivfi6a.dialup.mindspring.com ([165.247.200.202]
	helo=mindspring.com)
	by stork.mail.pas.earthlink.net with asmtp (SSLv3:RC4-MD5:128)
	(Exim 3.33 #1)	id 19RsGW-00020F-00; Mon, 16 Jun 2003 04:35:12 -0700
Message-ID: <3EEDA76C.43795D89@mindspring.com>
Date: Mon, 16 Jun 2003 04:18:04 -0700
From: Terry Lambert <tlambert2@mindspring.com>
X-Mailer: Mozilla 4.79 [en] (Win98; U)
X-Accept-Language: en
MIME-Version: 1.0
To: Tony Finch <dot@dotat.at>
References: <1079.10.0.81.10.1055692530.squirrel@www.mundomateo.com>
	<Pine.NEB.3.96L.1030615125423.98988D-100000@fledge.watson.org>
	<E19RrTD-0006yV-00@chiark.greenend.org.uk>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-ELNK-Trace: b1a02af9316fbb217a47c185c03b154d40683398e744b8a4c54ec960071150b12c3c5d8ffae0139b350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c
cc: hackers@freebsd.org
cc: oremanj@www.get-linux.org
Subject: Re: kqueue alternative?
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 16 Jun 2003 11:35:23 -0000

Tony Finch wrote:
> Joshua Oreman <oremanj@webserver.get-linux.org> wrote:
> >On Sun, 15 Jun 2003, Matthew Hagerty wrote:
> >>
> >> I'm writing a little application that needs to watch a file that another
> >> process is writing to, think 'tail -F'.
> >
> >I would say, use select(2).
> >Is there a reason this wouldn't work?
> 
> Select doesn't work with files.

The current "tail -f" uses kqueue.  The prior "tail -f" used
to open the file, and fstat() it in a 1 second sleep() loop,
looking for the file to get larger.

So your "alternative to kqueue" is to sleep loop and fstat.

-- Terry