How to create a lightweight C code sandbox?

Question

I\'d like to build a C pre-processor / compiler that allows functions to be collected from local and online sources. ie:

#fetch MP3FileBuilder http://scripts         


        

Answer 1

8 years later and I've discovered a new platform that meets all of my original requirements. Web Assembly allows you to run a C/C++ subset safely inside a browser and comes with similar safety restrictions to my requirements such as restricting memory access and preventing unsafe operations on the OS and parent process. It's been implemented in Firefox 52 and there are promising signs other browsers will support it in the future.