linux-kernel - Re: O_CAREFUL flag to disable open() side effects

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Date:	Thu, 27 Jul 2006 19:05:16 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Pekka J Enberg <penberg@...Helsinki.FI>,
	Ulrich Drepper <drepper@...il.com>,
	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: O_CAREFUL flag to disable open() side effects

Ar Iau, 2006-07-27 am 10:33 -0700, ysgrifennodd H. Peter Anvin:
> For a conventional file, directory, or block device O_CAREFUL is a 
> no-op.  For ttys it would typically behave similar to O_NONBLOCK 
> followed immediately by a fcntl to clear the nonblock flag.

Linus long ago suggested O_NONE to go with RO/RW/WO. Its not that hard
to do with the current file op stuff but you have to work out what the
access permission semantics of it are and what it means for ioctl etc

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