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SubjectRe: Safe error numbers for User-defined return values
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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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