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

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Message-ID: <4660B38A.3040908@gatworks.com>
Date:	Fri, 01 Jun 2007 20:02:18 -0400
From:	Uncle George <netbeans@...works.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	linux-kernel@...r.kernel.org
Subject: Re: SELECT() returns 1 But FIONREAD says (Input/output error)

Robert Hancock wrote:

> It's because you haven't done anything to handle the error which is 
> still persisting. Likely the only thing sane you can do in this case is 
> close the fd and try to reopen it later.
> 
This seems to be true, but not for what you might think.

It appears that if u plug the USB/serial device back into the usb-hub, 
the code creates a /dev/ttyUSB1 ( if you have not yet closed the 
disconnected /dev/ttyUSB0. ) When you do close /dev/ttyUSB0, then the 
device is erased from the /dev directory.

Now /dev/ttyUSB1 is the device. And /dev/ttyUSB0 disappeared. This does 
not seem proper. As now the program has no idea or capability to re-open 
the GPS device.

I have been informed that this was an approved kernel feature. Is this 
suppose to happen? Or was it an unintended consequence?
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