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

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Date:	Wed, 27 Apr 2011 14:37:30 +0800
From:	Lifeng Sun <lifongsun@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] Applying inappropriate ioctl operation on socket should
 return ENOTTY

On 07:58 Wed 04/27/11 Apr, Eric Dumazet wrote:
> Really ?
> 
> EINVAL is ok too : Request or argp is not valid.

I'm afraid not. SUSv4 specifies, say,

  int tcsetattr(int fildes, int optional_actions,
         const struct termios *termios_p);

 ERROR:
  [EINVAL]
      The optional_actions argument is not a supported value, or an
      attempt was made to change an attribute represented in the
      termios structure to an unsupported value.

  [ENOTTY]
      The file associated with fildes is not a terminal.

which means when we apply tcsetattr (implemented by ioctl) to _any_
non-terminal file descriptor, it should set errno to ENOTTY rather
than EINVAL.

> I would say, its not a bug as you claim. 
> 
> Its really too late to make such change and risk regressions.
> 
> isatty(fd) performs well. Please use it instead.
> 
> Also, networking patches should be sent to netdev@...r.kernel.org and
> David Miller, as mentioned in MAINTAINERS file.

Thank you.

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