linux-kernel - Re: SELECT() returns 1 But FIONREAD says (Input/output error)

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Message-ID: <4660523B.3000206@gatworks.com>
Date:	Fri, 01 Jun 2007 13:07:07 -0400
From:	Uncle George <netbeans@...works.com>
To:	davids@...master.com, linux-kernel@...r.kernel.org
Subject: Re: SELECT() returns 1 But FIONREAD says (Input/output error)

David Schwartz wrote:
>> David Schwartz wrote:
> 
>>> Nope. An errored connection is always ready for read/write -- there is
>>> nothing to wait for as far as the kernel is concerned. Your code keeps
>>> asking the kernel if something interesting has happened, the
>>> kernel keeps
>>> telling it yes, and it refuses to do anything about it.
> 
>> The select() returns because i pulled the USB cable from hub. Seems
>> reasonable.
> 
> Good. Then there is nothing further to discuss.
> 
>> The next select() found what? to be interesting in order to prematurely
>> terminate the select-wait? As far as I can tell, nothing interesting has
>> happened since the previous select(). In this case the select() is only
>> looking at read()'s.
> 
> You have a very serious misunderstanding of what 'select' does. The 'select'
> function is level triggered and state based, not edge triggered or event
> based. The situation was the same as before, and so the same result is
> required.

The misunderstanding is from the docs.
The select() does not report device errors.
Select will just "more precisely, to see if a read will not block".



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