linux-kernel - Re: O_NONBLOCK setting "leak" outside of a process??

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Date:	Fri, 2 Feb 2007 16:04:13 +0100
From:	Roland Kuhn <rkuhn@....physik.tu-muenchen.de>
To:	"Guillaume Chazarain" <guichaz@...il.com>
Cc:	"Philippe Troin" <phil@...i.org>,
	"Denis Vlasenko" <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: O_NONBLOCK setting "leak" outside of a process??

Hi Guillaume!

On 2 Feb 2007, at 14:48, Guillaume Chazarain wrote:

> 2007/2/2, Roland Kuhn <rkuhn@....physik.tu-muenchen.de>:
>
>> That's a bug, right?
>
> No, if you want something like: (echo toto; date; echo titi) > file
> to work in your shell, you'll be happy to have the seek position
> shared in the processes.
>
As a naive user I'd probably expect that each of the above adds to  
the output, which perfectly fits the O_APPEND flag (to be set by the  
shell, of course).

The immediate point was about the flags, though, and having  
O_NONBLOCK on or off certainly is a _design_ choice when writing a  
program. If I remove O_NONBLOCK, I have a right to expect that I/O  
functions do not return EAGAIN!

Ciao,
                     Roland

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