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资源说明：The Common Foreign Function Interface
[](https://travis-ci.org/cffi/cffi) # What CFFI, the Common Foreign Function Interface, purports to be a portable FFI for Common Lisp. It abstracts away the differences between the API of the native FFI's of the various Common Lisp implementations. # How The CFFI library is composed of a Lisp-implementation-specific backend in the CFFI-SYS package, and a portable frontend in the CFFI package. The CFFI-SYS backend package defines a low-level interface to the native FFI support in the Lisp implementation. It offers operators for allocating and dereferencing foreign memory, calling foreign functions, and loading shared libraries. The CFFI frontend provides a more comfortable, declarative interface for defining foreign functions, structures, typedefs, enumerated types, etc. It is implemented in portable ANSI CL making use of the low-level operators exported by CFFI-SYS. The CFFI-LIBFFI subsystem loads support for passing structs by value. It requires [libffi](https://sourceware.org/libffi/) for that. Please consult [the manual](http://common-lisp.net/project/cffi/manual/html_node/) for further details, including installation instructions. # Where Please visit [Github](https://github.com/cffi/cffi/issues) for bug reports, feature suggestions, the latest version, and to send your contributions. CFFI also has a [mailing list](https://mailman.common-lisp.net/listinfo/cffi-devel), and a project page at [cffi.common-lisp.dev](https://cffi.common-lisp.dev/). # Notes ### CFFI/C2FFI CFFI/C2FFI is an ASDF-integrated mechanism to automatically generate a complete CFFI binding from a C header file. It requires a CLI tool called [c2ffi](https://github.com/rpav/c2ffi), but only for the developers of the libraries, not their users. `c2ffi` is written in C++, and it uses LLVM/Clang as the parsing library. It generates JSON output that can be checked in into the repositories. CFFI/C2FFI uses these JSON files to automatically generate a CL file that contains the CFFI definition forms. The generated bindings mirror the C namespace into an otherwise empty CL package as closely as possible. It means that they retain the upper/lower case of the names, and it also includes the `#define` macros as CL constants. Until CFFI/C2FFI is properly documented, you may check out these projects as examples: [hu.dwim.zlib](https://github.com/hu-dwim/hu.dwim.zlib), [hu.dwim.sdl](https://github.com/hu-dwim/hu.dwim.sdl), [hu.dwim.bluez](https://github.com/hu-dwim/hu.dwim.bluez), and [hu.dwim.mosquitto](https://github.com/attila-lendvai/hu.dwim.mosquitto). ### Related projects - [cl-autowrap](https://github.com/rpav/cl-autowrap) is another project that uses `c2ffi` to generate CFFI bindings.
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