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Date:      Sun, 15 Jun 2003 12:57:40 -0400 (EDT)
From:      Robert Watson <rwatson@freebsd.org>
To:        Matthew Hagerty <matthew@mundomateo.com>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: kqueue alternative?
Message-ID:  <Pine.NEB.3.96L.1030615125423.98988D-100000@fledge.watson.org>
In-Reply-To: <1079.10.0.81.10.1055692530.squirrel@www.mundomateo.com>

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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'.  kqueue and kevent are going to
> do it for me on *BSD, but I'm also trying to support *cough* linux and
> other UN*X types OSes. 
> 
> >From what I can find on google, the linux community seems very opposed
> to kqueue and has not yet implemented it (they say: blah blah blah,
> aio_*, blah blah balh.)  What alternatives do I have with OSes that
> don't support kqueue?  I'd really hate to poll with stat(), but do I
> have any other choices? 

I was recently told about a library named libevent from Niels Provos,
which abstracts a variety of underlying event mechanisms behind a common
API.  You can learn a bit more about it here: 

  http://www.monkey.org/~provos/libevent/

It doesn't appear to support /dev/poll yet, but the web page suggests such
support is planned.  If it's not already a port, we should create one. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Network Associates Laboratories



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