Multiple Library and Binary Directories

Norman Feske norman.feske at ...1...
Thu Oct 30 11:19:57 CET 2014

Hello Ben,

> I have been looking through the Genode run scripts, and it seems that
> init will only look in the root of a ROM for both libraries and
> binaries. It would be very useful to be able to search for binaries and
> libraries in multiple directories (e.g. /lib, /usr/lib, /bin, /usr/bin,
> etc.) Also, is there a way to separate the library and binary
> directories without hacking init? If not, how hard would it be to hack
> init to add this feature?

I would advise against changing init. If you want to fetch libraries
from different portions of a file system or from different file systems,
I recommend you to create a more sophisticated version of fs_rom, which
does not use a single file-system session but multiple. Let me call it
"multi_fs_rom" for now. The ROM modules will still be requested by their
plain names. The multi_fs_rom service will scan the search locations for
files with the supplied name and hand out the file content as a
dataspace. This way, you can keep libraries and executables at arbitrary

To let CLI monitor use your multi_fs_rom service instead of obtaining
ROM modules from core, add the following line at the beginning of the
routing configuration of cli_monitor:

  <service name="ROM"> <child name="multi_fs_rom"/> </service>

It looks like it is time to develop your first ROM service. :-)


Dr.-Ing. Norman Feske
Genode Labs ·

Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth

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