netdev - Re: [PATCH] Applying inappropriate ioctl operation on socket should return ENOTTY

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Message-ID: <20110427125201.18395e2f@lxorguk.ukuu.org.uk>
Date:	Wed, 27 Apr 2011 12:52:01 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Lifeng Sun <lifongsun@...il.com>, linux-kernel@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Applying inappropriate ioctl operation on socket should
 return ENOTTY

> Well, I wont argue the point, especially if you Ack the changes ;)
> 
> My only concern was to not break old applications, I dont know if it is
> going to break _any_ of them. Probably these old applications stick with
> old kernels.

The number of applications that actually check ioctl error codes beyond
if error perror; return is pretty small and those that do generally do so
for very narrow cases or for things like EWOULDBLOCK/EINTR stuff.

> If you ask me ENOTTY is plain wrong.
> ioctl() is not restricted to terminal devices at all.

Like the tab/space thing in Makefiles and Qwerty keyboards its now part of
how stuff all works but EINVAL is even worse because you cannot tell
between 'this ioctl isn't know/is used on the wrong fd' and 'argument
wrong to valid ioctl'

Alan
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