From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jeff Garzik <jeff@garzik.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [RFC] Remove or convert empty ioctls ?
Date: Thu, 15 Oct 2009 16:01:09 +0100 [thread overview]
Message-ID: <20091015160109.6d9353e8@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <4AD711BC.2030409@garzik.org>
> "no particular value" is highly subjective, and I think unprovable,
> without an exhaustive survey of userland programs interacting with
> kernel drivers. Userland programs often interact with a -class- of
> drivers, expecting predictable behavior from a DoThisThing ioctl, with
> EINVAL or "other weird error code" returned intentionally.
>
> Changing the return codes seems quite unwise.
We've changed lots of them to -ENOTTY over the past few years, nobody has
even noticed (you included ;))
SuS says an unknown ioctl code returns -ENOTTY.
Alan
next prev parent reply other threads:[~2009-10-15 15:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-15 9:20 Thomas Gleixner
2009-10-15 12:12 ` Jeff Garzik
2009-10-15 15:01 ` Alan Cox [this message]
2009-10-15 15:22 ` Jeff Garzik
2009-10-15 15:31 ` Alan Cox
2009-10-15 15:35 ` Jeff Garzik
2009-10-15 15:49 ` Alan Cox
2009-10-15 16:03 ` Jeff Garzik
2009-10-15 16:23 ` Thomas Gleixner
2009-10-15 16:28 ` Thomas Gleixner
2009-10-15 15:50 ` Ingo Molnar
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