From owner-freebsd-hackers  Wed Nov 13 23:06:32 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id XAA19511
          for hackers-outgoing; Wed, 13 Nov 1996 23:06:32 -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 XAA19487
          for <hackers@FreeBSD.org>; Wed, 13 Nov 1996 23:06:25 -0800 (PST)
Received: (from bde@localhost) by godzilla.zeta.org.au (8.7.6/8.6.9) id SAA03327; Thu, 14 Nov 1996 18:04:30 +1100
Date: Thu, 14 Nov 1996 18:04:30 +1100
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199611140704.SAA03327@godzilla.zeta.org.au>
To: bde@zeta.org.au, roell@crab.xinside.com
Subject: Re: Is our ASYNC I/O support for ttys broken?
Cc: hackers@FreeBSD.org, jkh@time.cdrom.com
Sender: owner-hackers@FreeBSD.org
X-Loop: FreeBSD.org
Precedence: bulk

>If the ioctl's would work as descrribed there would be no problem, but
>as I mentioned already, they don't.

Actually, they do:

ERRORS
     Fcntl() will fail if:
     ...
     In addition, if fd refers to a descriptor open on a terminal device (as
     opposed to a descriptor open on a socket), a cmd of F_SETOWN can fail for
     the same reasons as in tcsetpgrp(3),  and a cmd of F_GETOWN for the rea-
     sons as stated in tcgetpgrp(3).

Bruce