Re: Improved INCLUDE_CONFIG_FILE

On 03/25/07 09:34, Gavin Atkinson wrote:
> On Sat, 24 Mar 2007, Wojciech A. Koszek wrote:
>> On Sun, Mar 25, 2007 at 08:00:41AM +1000, Peter Jeremy wrote:
>>> On 2007-Mar-24 15:32:00 +0100, Robert Watson <rwatson_at_freebsd.org> wrote:
>>>> On Sat, 24 Mar 2007, Wojciech A. Koszek wrote:
>>>>> I'd like to have this enabled by default, and I know there should be no
>>>>> strong objections.
>>>> I agree -- the memory used by it is very small compared to the amount of
>>>> memory in modern systems, and the potential administrative benefit is very
>>>> large.  As long as it remains an option, the embedded folk can turn it off
>>>> easily.
>>> Ideally, we would include it in a .comment section that wasn't loaded.
>>> Unfortunately my ELF-foo isn't up to this (I've tried something similar
>>> many years ago and couldn't get the linker to DWIW).
>> In my current implementation, kernel configuration content is converted
>> to the string and is actually put into separate ELF section. However,
>> it's not .comment but a loadable section, since otherwise you wouldn't
>> be able to obtain the configuration of a running system.
> 
> strings `sysctl -n kern.bootfile` | grep ^___ | sed -e 's/^___//'
> 
> should still work if it was in a .comment section


Unless you no longer have the running kernel, or it has changed since 
the boot up of the system.  A sysctl knob to dump it is *very* useful.


Eric