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

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

Hi, all!

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.


Thank you,

Oleksandr

[1] https://marc.info/?l=xen-devel&m=148528530727366&w=2

[2] https://marc.info/?l=xen-devel&m=148239440624498&w=2

[3] https://marc.info/?l=xen-devel&m=148530334732400&w=2

[4] http://pubs.opengroup.org/onlinepubs/007908799/xsh/errno.h.html


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