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Re: Contribution to the Hurd on L4

From: Bas Wijnen
Subject: Re: Contribution to the Hurd on L4
Date: Fri, 31 Dec 2004 00:30:36 +0100
User-agent: Mozilla Thunderbird 0.9 (X11/20041124)

Matthieu Lemerre wrote:

I'm happy each time I can understand something, by myself or with your
help, and I thank you a lot to provide it to me.

But maybe I should post my messages to help-hurd? I don't want to
flood the mailing list with uninterresting questions.

No, help-hurd is for questions from users, not developers. Everything regarding the L4 port should be on this list, for the Mach port, there is debian-hurd for debian related things, and bug-hurd for the rest (except user questions).

From your original e-mail:
> -What is the root capability? It does not appear in the hurd-on-l4
>  document. Is it the same as the master control capability, that I
>  understand as a right to do any RPC on a server?

No. The master control capability is not a universal thing, every capability can choose to either or not provide such a thing. The root capability is built into the capability server (well, I think the patch I submitted[1] for that hasn't been applied yet, but it should be ;-) ). It is the only way to access a capability server without having a capability for it. I expect this functionality to be used mostly (if not only) for aquiring a capability from the server, with which further RPCs can be done. For example, the task server needs it to provide task info capabilities.


[1] http://lists.gnu.org/archive/html/l4-hurd/2004-08/msg00044.html

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