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

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Date:	Fri, 2 Feb 2007 13:10:32 +0100
From:	Roland Kuhn <rkuhn@....physik.tu-muenchen.de>
To:	Philippe Troin <phil@...i.org>
Cc:	Denis Vlasenko <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: O_NONBLOCK setting "leak" outside of a process??

Hi Philippe!

On 2 Feb 2007, at 00:15, Philippe Troin wrote:

> Denis Vlasenko <vda.linux@...glemail.com> writes:
>
>> What share the same file descriptor? MC and programs started from it?
>
> All the processes started from your shell share at least fds 0, 1  
> and 2.
>
>> I thought after exec() fds atre either closed (if CLOEXEC) or
>> becoming independent from parent process
>> (i.e. it you seek, close, etc your fd, parent would not notice that).
>>
>> Am I wrong?
>
> I'm afraid so.  Seek position and flags are still shared after an
> exec.
>
That's a bug, right? I couldn't find anything to that effect in IEEE  
Std. 1003.1, 2004 Edition...

Ciao,
                     Roland

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