From: Aristeu Rozanski <aris@redhat.com>
To: Peter Hurley <peter@hurleysoftware.com>
Cc: linux-kernel@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.cz>
Subject: Re: [PATCH] n_tty_read: check for hanging tty while waiting for input
Date: Tue, 17 Feb 2015 16:50:46 -0500 [thread overview]
Message-ID: <20150217215046.GC13666@redhat.com> (raw)
In-Reply-To: <54E3B27E.9020506@hurleysoftware.com>
Hi Peter,
On Tue, Feb 17, 2015 at 04:28:30PM -0500, Peter Hurley wrote:
> On 02/17/2015 04:06 PM, Aristeu Rozanski wrote:
> > If the console has a canonical reader and the respective tty hangs up,
> > it'll waste a wake up and will never release the last ldisc reference so
> > the hangup process can finish:
>
> This behavior is by-design; /dev/console cannot be hung-up.
hangup is issued on the tty that happens to be the console. In this
case, ttyS0.
> What process is sleeping on /dev/console read() and what is its controlling
> tty? I ask because console teardown usually happens when SIGHUP is
> received by the process group.
ttyS0 is the controller tty.
--
Aristeu
next prev parent reply other threads:[~2015-02-17 21:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-17 21:06 [PATCH] n_tty_read: check for hanging tty while waiting for input Aristeu Rozanski
2015-02-17 21:28 ` Peter Hurley
2015-02-17 21:50 ` Aristeu Rozanski [this message]
2015-02-17 22:35 ` Peter Hurley
2015-02-18 14:58 ` Aristeu Rozanski
2015-02-18 15:40 ` Peter Hurley
2015-02-18 15:56 ` Aristeu Rozanski
2015-02-18 16:38 ` Peter Hurley
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