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Re: Troubles with updating Debian Hurd

On Fri, Oct 8, 2021 at 9:03 PM Samuel Thibault <sthibault@debian.org> wrote:
> Sergey Bugaev, le ven. 08 oct. 2021 21:01:09 +0300, a ecrit:
> > I wonder if it'd be possible to change device_{read,write} to use a
> > 64-bit integer without introducing separate new RPCs,
> No: RPC interfaces have fixed typing, expressed in the mig files.

RPC interfaces are whatever we want them to be :) — as long as we keep
things compatible with old clients. Specifically, we could say,

type recnum_t = uint64_t | array[*:2] of uint32_t;

and voila, (new) clients send 64-bit numbers, but the servers can accept either.

I'm more concerned that it would change glibc ABI, as clients would
now be expected to pass 64-bit numbers.

> Trying to magically extent is asking for much more trouble than just
> adding the new RPCs.

I'm not saying that I'm convinced that it's worth it — perhaps adding
new RPCs and switching all users to them would be easier. But it's an
interesting possibility.


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