Re: [Xen-devel] POSIX error names and codes in PV protocols

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.01.17 at 15:40, <andr2000@xxxxxxxxx> wrote:
> There is some work happening on new PV protocols: sndif [1],
> 
> displif [2], PV calls [3] and the common part of those is that
> 
> error/status codes must be returned as a part of a response packet.
> 
> For that Konrad suggested [1] (and Stefano already used in [3]) POSIX
> 
> to be employed here instead of defining protocol specific error codes.
> 
> The problem I see here is that POSIX only defines names of the errors,
> 
> but not values [4]. So, in order to use POSIX one still needs to define
> 
> the values (names must be the same, but values may differ for different 
> OSes).
> 
> So, the question is what would be the best option to
> 
> a) have those numbers defined in OS agnostic way
> 
> b) have those defined for all PV protocols
> 
> Stefano has already defined the error code values in his work [3],
> 
> but for other protocols this should be reimplemented again.

Aren't these simply what public/errno.h provides? Why would any
Xen specific protocol want to define their own, now that we have
this base set?

Jan


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