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

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Message-Id: <E1Hu65z-0000wG-9a@be1.lrz>
Date:	Fri, 01 Jun 2007 14:19:04 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Uncle George <netbeans@...works.com>, linux-kernel@...r.kernel.org
Subject: Re: SELECT() returns 1 But FIONREAD says (Input/output error)

Uncle George <netbeans@...works.com> wrote:

> i am using the GARMIN_GPS/usb driver to read a gps receiver.
> In testing the ability of my software to recover from various errors, I
> try this: unplug the gps/USB cable from the usb hub.
> 
> Interestingly enough the thread spins.
> the SELECT() waits for something to happen, and I get one channel that
> something interesting happened.

Or, more precisely, that you won't have to wait for an event.

> Needless to day, the code resets the SELECT parameters, and SELECT is 
> called again. It again says that something interesting has happened on 
> that ( i/o errored ) channel. And we now repeat the  FIONREAD.

That's exactly what select promised you'd get.
-- 
Today's assembler command: EXOP Execute Operator 

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