If you are interested in FFI and Perl you should probably consider newer projects, such as FFI::Platypus or FFI::Raw instead. They have more features, are usually faster and are actively maintained. The original README follows. The FFI and FFI::Library modules implement a foreign function interface for Perl. The foreign function interface allows Perl code to directly call C functions exported from shared libraries (DLLs on Windows, .so files on Unix). It also allows a Perl subroutine to be packaged as a function which can be passed to an external C routine ("callbacks"). There are two modules in the package: * FFI is a low-level interface, providing two functions, call() and callback(). The call() routine expects to be passed a "raw" function address, but the module provides no way of creating such an address. That is left to other modules. * FFI::Library encapsulates the concept of a shared library. It offers functions to load a library (and to automatically unload it when it is no longer required), and to extract functions from the library, in a form suitable for calling from Perl. See the file INSTALL for installation details.