linux-kernel - Re: [PATCH] Use ERESTARTNOHAND if poll() is interrupted by a signal

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Message-ID: <20070730235645.GN3672@sequoia.sous-sol.org>
Date:	Mon, 30 Jul 2007 16:56:45 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Use ERESTARTNOHAND if poll() is interrupted by a signal

* Manfred Spraul (manfred@...orfullife.com) wrote:
> poll() returns -EINTR if a signal is pending.
> EINTR is a bad choice: it means that poll returns to user space if the
> task is stopped by SIGSTOP/SIGCONT or by the freezer.
> select() and ppoll() both use ERESTARTNOHAND, this avoids a return to
> user space for signals that are handled by the kernel.

This does change user visible behaviour, however, it's already
inconsistent as you've noted.  I was concerned about that change, but
wrote some tests and this behaviour does make sense to me.

thanks,
-chris
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