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Subject: Re: Safe error numbers for User-defined return values
To: lkml@andyjeffries.co.uk (Andy Jeffries)
Date: Tue, 6 Nov 2001 11:57:59 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20011106112216.24a769aa.lkml@andyjeffries.co.uk> from "Andy Jeffries" at Nov 06, 2001 11:22:16 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> I want to define custom return values for my ioctl calls in my Kernel 
> module.  What is the recommended start value for user defined constants?  
> I notice asm/errno.h only goes up to 124 (in 2.4.12), so should I start at 
> 125 or should I start at 200 to be safe?
> 
> I probably only need 30 or so different codes.

You want to return non base errno codes in a different field and return
real errno codes by return value. If everyone simple invented private
returns for ioctl all hell would break loose
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