exporting C local variables : JNI run-time behavior issue

Question

I want to export some static variables in C library (libA for instance) to use them from outside in other C file.

I used to use extern keyword for the desktop application and it was working, however when I moved to JNI & Android, the extern keyword couldn't do the trick because when trying to build the *.so of the libA, regardless of my other C file (which uses the libA static variables), I got copiler error of "undefined reference" for all of the "extern variables" of libA.

For that, I tried to link the C file when generating the *.so of the libA, but at run time, I noticed that the variables have different addresses which is not the normal result of the extern keyword. ( meaning that I'm manipulating different addresses <=> different variables instead of same address <=> "same variable").

So, is there a way to solve this issue ? maybe using memcpy or memset and if it's the proper way, please how to do that ?

Thanks in advance.

BR

Answer 1

would setting up a environment variable in the JNI file help you out?

Eg: setenv("GLOBALVARIABLE", "ON", 1);