The Jem team is pleased to announce the release of Kcfg, an in-kernel simple
configuration utility. Kcfg is intended for the same class of special embedded
Linux applications as Kcli is, i.e., those applications with no user space. If
you don't understand what kind of application that is, look at Jem itself
at http://www.javadevices.com which is on schedule for release in August.
Kcfg is the second spin-off from the Jem project.
Kcfg is a kernel loadable module that reads a configuration file of name/value
pairs, and allows other kernel modules to query those values. Once a
configuration file has been loaded by the module, other kernel modules can
query the configuration values by name, set values, add new values, store
the current values back to the configuration file and add callbacks to values
in order to be informed when the values are modified.
To head off the obvious criticisms, be aware of the following:
1) We know about module parameters, but, when you have 20 configurable
items, module parameters become impractical. Also, when you have no user
space from which to load the module, parameters are even less practical.
2) We know about the other possibilities like sysfs, or the firmware mechanism,
but we don't have a user space so that doesn't work for us either.
As always, and just like the GPL says, we don't claim that this code is fit for any
purpose, nor do we claim that it is a better way of doing things. However, judging
by the amount of downloads of Kcli,we think we were quite right in our assumption
that people are doing some pretty weird things with the Linux kernel, and this
code is for them.
Finally, don't even bother thinking about including this code in the mainline kernel,
as it breaks some rules, like reading and writing files in a kernel module. We
think the greatest fun of the Linux kernel, is you get to break all the rules.
The patch is available at: ftp://www.javadevices.com/kcfg
As a side note, updates to Kcli have been posted at: ftp://www.javadevices.com/kcli
MRanon
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