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To: Matthew Garrett <mjg59@srcf.ucam.org>
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Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
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On Thu, May 27, 2010 at 07:56:58PM +0100, Matthew Garrett wrote:
> Even if it's using poll, it could block purely on the display if X turns 
> the screen off between poll() waking and the write being made.

That's what fcntl(fd, F_SETFL, O_NONBLOCK) is for.