linux-kernel - Re: O_NONBLOCK is broken

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Date:	Tue, 14 Aug 2007 19:28:51 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: O_NONBLOCK is broken


On Aug 14 2007 13:33, Alan Cox wrote:
>
>> b) Make recv(fd, buf, size, flags) and send(fd, buf, size, flags);
>>    work with non-socket fds too, for flags==0 or flags==MSG_DONTWAIT.
>>    (it's ok to fail with "socket op on non-socket fd" for other values
>>    of flags)
>
>I think that makes a lot of sense, and to be honest other MSG_ flags make
>useful sense and have meaningful semantics that might be helpful
>elsewhere if ever coded that way.
>
>If you want to do this the first job is going to be to sort out the way
>non-block is propogated to device driver read/write handlers. At the
>moment they all check filp->f_flags

And a side effect, kernel code (kthreads) rarely allocate a file
descriptor.


	Jan
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