From owner-freebsd-current  Sun Dec  1 18:26:54 1996
Return-Path: owner-current
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id SAA13335
          for current-outgoing; Sun, 1 Dec 1996 18:26:54 -0800 (PST)
Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19])
          by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id SAA13327
          for <freebsd-current@freebsd.org>; Sun, 1 Dec 1996 18:26:49 -0800 (PST)
Received: (from bde@localhost) by godzilla.zeta.org.au (8.8.3/8.6.9) id NAA07079; Mon, 2 Dec 1996 13:14:50 +1100
Date: Mon, 2 Dec 1996 13:14:50 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199612020214.NAA07079@godzilla.zeta.org.au>
To: archie@whistle.com, freebsd-current@freebsd.org
Subject: Re: /dev/tun0 question
Sender: owner-current@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>Try the following command (if you have a tunnel device configured)..
>
>  cat < /dev/tun0
>
>The process gets stuck in disk wait and can't be killed, even with
>kill -9 .. how come?

tunread() sleeps uninterruptibly.  This should be easy to fix - just
add PCATCH to the tsleep flags and return if the sleep is interrupted.
There seems to be no state to clean up.

Bruce