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

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Date:	Sun, 4 Feb 2007 02:22:13 +0100
From:	Denis Vlasenko <vda.linux@...glemail.com>
To:	davids@...master.com
Cc:	"Philippe Troin" <phil@...i.org>, linux-kernel@...r.kernel.org
Subject: Re: O_NONBLOCK setting "leak" outside of a process??

On Sunday 04 February 2007 01:55, David Schwartz wrote:
> 
> > That's a bug, right? I couldn't find anything to that effect in IEEE
> > Std. 1003.1, 2004 Edition...
> >
> > Ciao,
> >                      Roland
> 
> It's not a bug, there's no rational alternative. What would two indepedent
> file descriptors for the same end of a TCP connection be?

Easy. O_NONBLOCK should only affect whether read/write blocks or
returns EAGAIN. It's logical for this setting to be per-process.

Currently changing O_NONBLOCK on stdin/out/err affects other,
possibly unrelated processes - they don't expect that *their*
reads/writes will start returning EAGAIN!

Worse, it cannot be worked around by dup() because duped fds
are still sharing O_NONBLOCK. How can I work around this?
--
vda
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