linux-kernel - Re: [patch/rfc] Make poll/select report error (POLLNVAL and EBADF) for unsupported files

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Date:	Mon, 15 Feb 2010 18:47:47 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	stephane.thiell@....fr
Subject: Re: [patch/rfc] Make poll/select report error (POLLNVAL and EBADF)
 for unsupported files

Le lundi 15 février 2010 à 18:42 +0100, Eric Dumazet a écrit :

> Hmm, according to POSIX :
> 
> 	The poll() function shall support regular files, terminal and
> pseudo-terminal devices, FIFOs, pipes, sockets ...
> 
> 	Regular files shall always poll TRUE for reading and writing.
> 
> 
> So unless I missed something, this patch could break some conformant
> applications.
> 
> In particular, if an application is polling() on stdin (usually a tty),
> and other 'files', what's happening if we do :
> 
> cat replay_file | application

Doh..

I meant : application < replay_file

> 
> Either it wont read stdin, or application exits without reading its
> input.
> 


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