linux-kernel - Re: Inconsistency between PTY read() return values

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Date:	Wed, 8 Apr 2009 19:09:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ed Schouten <ed@...eBSD.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Inconsistency between PTY read() return values

On Wed, 8 Apr 2009 19:56:03 +0200
Ed Schouten <ed@...eBSD.org> wrote:

> Hi Alan,
> 
> * Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > I would argue that TTYs do behave this way. We treat the disconnect as a
> > hang up event. BSD sees it as EOF, Linux as hangup.
> 
> Would you mind explaining me the difference? I thought a modem
> disconnect implies an end-of-file condition? 

A modem disconnect is a hang up which is quite different to an EOF and is
effectively a security barrier as well (existing users of the tty port
lose access to it aka revoke())
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