libffi: FFI stands for Foreign Function Interface. A foreign function 
libffi: interface is the popular name for the interface that allows code 
libffi: written in one language to call code written in another language. 
libffi:
libffi: The libffi library really only provides the lowest, machine dependent
libffi: layer of a fully featured foreign function interface. 
libffi: 
libffi: A layer must exist above libffi that handles type conversions for 
libffi: values passed between the two languages.  
libffi:
libffi: