linux-kernel - Re: [RFC/PATCH] revoke/frevoke system calls V2

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Date:	Tue, 08 Aug 2006 13:15:38 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Chase Venters <chase.venters@...entec.com>
Cc:	Edgar Toernig <froese@....de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, akpm@...l.org,
	viro@...iv.linux.org.uk, tytso@....edu, tigran@...itas.com
Subject: Re: [RFC/PATCH] revoke/frevoke system calls V2

Ar Llu, 2006-08-07 am 17:24 -0500, ysgrifennodd Chase Venters:
> implementation is crude. "EBADF" is not something that applications are 
> taught to expect. Someone correct me if I'm wrong, but I can think of no 
> situation under which a file descriptor currently gets yanked out from 
> under your feet -- you should always have to formally abandon it with 
> close().

The file descriptor is not pulled from under you, the access to it is.
This is exactly what occurs today when a tty is hung up. That could be
almost any fd because paths could be symlinks to a pty/tty pair...

In the tty case you get -ENXIO

Alan

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