If it&#x27;s easy, then you could just run the program as normal with a few test cases. If you&#x27;re a web browser for example, use it to browse some web pages. If you&#x27;re a BitTorrent client, use it to download some Linux ISOs.<p>If the interpreter limits the external resources available[1], then you&#x27;d have to rephrase the guts of your C program as a pure computation. Then if you had a program for rendering HTML files into BMP files, I would collect a couple examples and run it with them as input.<p>If necessary, you could embed the test data into a .c file that exercises the rendering code and remove any dependency on user input.<p>&quot;Just run the program&quot; doesn&#x27;t constitute a correctness proof. And if you have access to kernel functions at all, I&#x27;m sure there&#x27;s a way to rewrite your own code at runtime while not invoking undefined behavior. It looks like CompCert C&#x27;s formally verified C Interpreter[1] only allows print, free, and malloc as external resources.
[1] <a href="http:&#x2F;&#x2F;compcert.inria.fr&#x2F;man&#x2F;manual004.html" rel="nofollow">http:&#x2F;&#x2F;compcert.inria.fr&#x2F;man&#x2F;manual004.html</a>