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question about hurd

From: Sebastien DI MERCURIO
Subject: question about hurd
Date: Tue, 11 Mar 2003 23:39:59 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; fr-FR; rv:1.0.2) Gecko/20021120 Netscape/7.01


I've got a couple of question when looking at Hurd boot sequence. To start the system, Grub (or any other multiboot bootloader) launch 3 modules : the kernel, the exec server and the filesystem server. But, how thoses 3 modules know each other ? I can't figure out what low level mecanisms are in use for that.

Also, when a new module is loaded, how its interface, made of functions and shared variables, is made accessible for other modules, library or task ? For exemple, with the three modules (kernel, exec and filesystem), how exec can know the entry point of a specific function of the kernel or the filesystem ?

I'm very interested in OS low level mecanisms and in Hurd specialy. Maybe, when my level of knowledge will become better, I will be able to contribute to this project, but for the moment, I need to learn more.

Thank you

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