There are four variants of the libhw.so shared library:
- English
- German
- Norwegian
- Spanish
All of them provide both a symbol for a constant string hello and a function world(), however both are different in each version.
Compile them by running
make
The program run will use the shared library to get the contents of the constant string hello and call the function world in a loop (with 1 second delay in between).
An optional first parameter limits the number of loops, while a second parameter will specify the loop in which the program calls fork (with the child then waits 2 seconds after each loop).
To test the update, either use the Makefile target test for a one minute demonstration, which will exchange the shared library with a different version every 5 seconds and fork after 13 seconds
make test
or manually by executing the program with live.so preloaded
LD_PRELOAD=$(readlink -f ../../live.so) ./run
while adjusting the symbolic link to the shared library at the same time
ln -f -s libhw-de.so libhw.so
sleep 5
ln -f -s libhw-en.so libhw.so
For debug output set the LIVE_LOGLEVEL environment variable to 4.