Re: User/kernelspace stuff to set/get kernel variables

From: Yann E. MORIN (yann.morin.1998@anciens.enib.fr)
Date: Thu Dec 13 2001 - 11:11:12 EST


Hi DK.

> Basically: is it possible to - one way or another - set variables at
> kernel boot and read those using userspace utilities?
> for instance: i boot my kernel (using any old bootmanager that
> accepts kernel params)
> LILO: linux network=dhcp
> and later, in the init scripts, i check the value of this variable
> using some sort of userspace program, and if it happends to be
> 'dhcp' i'll invoke the dhcp client.
[--8<--SNIP--8<--]

You'll at least find that in /proc/1/environ

It's a null-terminated list of strings that consist of what you want.
You'll see it as well while dumping the kernel log (dmesg) at the
begining. For my machine, I have:

--8<--
Kernel command line: auto BOOT_IMAGE=linux root=806 devfs=mount idebus=33
--8<--

Regards,
Yann.

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