[Ns-developers] user-space code integration update

[Gustavo Carneiro]

2008/8/6 Mathieu Lacage <mathieu.lacage at sophia.inria.fr>

> hi,
>
> Recently, I resumed work on the ns-3-simu branch with a focus towards
> helping liu merge his code back into ns-3 and starting to port quagga.
> The biggest change in http://code.nsnam.org/mathieu/ns-3-simu is that I
> added support for loading in memory unmodified executables with an elf
> loader and running them over ns-3. This is implemented in the
> src/process/elf-loader.h|cc files through a bunch of tricks to force the
> libc elf loader to load the same binary multiple times in memory.
>
> I also added a lot of code to the libc replacement and have gotten
> sufficiently far to run the example programs in examples/process.cc and
> examples/process-udp-server.cc and examples/process-udp-client.cc.


For replacing many libc functions (e.g. it works for socket functions), you
can also use LD_PRELOAD to replace weak symbols.  I was wondering, what led
you down this more complicated path instead?

Thanks,

-- 
Gustavo J. A. M. Carneiro
INESC Porto, Telecommunications and Multimedia Unit
"The universe is always one step beyond logic." -- Frank Herbert