linux-kernel - Re: error to be returned while suspended

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Message-ID: <Pine.LNX.4.61.0610031014070.21369@chaos.analogic.com>
Date:	Tue, 3 Oct 2006 10:17:59 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: error to be returned while suspended

On Tue, 3 Oct 2006, Oliver Neukum wrote:

> Am Dienstag, 3. Oktober 2006 14:51 schrieb linux-os (Dick Johnson):
>>
>> On Tue, 3 Oct 2006, Oliver Neukum wrote:
>>
>>> Hi,
>>>
>>> which error should a character device return if a read/write cannot be
>>> serviced because the device is suspended? Shouldn't there be an error
>>> code specific to that?
>>>
>>> 	Regards
>>> 		Oliver
>>
>> The de-facto error codes were created long before one could "suspend"
>> a device, so there isn't a ESUSP code. However, I suggest EIO or EBUSY
>
> CUPS chokes on these. Is it acceptable to say that you should know
> what you're doing when suspending?
>

Well, you need to look at the CUPS documentation and find out
what return code would be non-fatal and tell it to buffer stuff
to try later (such as the return code you get when the printer
if off-line).

 	http://www.cups.org/documentation.php

>> unless you want to define an ESUSP and get it accepted by the POSIX
>> committee.
>

Even if you did that, CUPS would have to be modified to accept
the new error code. There should be a current error code that
will allow CUPS to continue.

> This would be the cleanest solution. How does one do that?
>
> 	Regards
> 		Oliver
>

Cheers,
Dick Johnson
Penguin : Linux version 2.6.16.24 on an i686 machine (5592.72 BogoMips).
New book: http://www.AbominableFirebug.com/
_
..

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