As of 20050212, MLton has an initial port of ML-NLFFI from SML/NJ to MLton. All of the ML-NLFFI functionality is present.
Additionally, MLton has an initial port of the mlnlffigen tool from SML/NJ to MLton. Due to low-level details, the code generated by SML/NJ's ml-nlffigen is not compatible with MLton, and vice-versa. However, the generated code has the same interface, so portable client code can be written. MLton's mlnlffigen does not currently support C functions with struct or union arguments.
Usage
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You can import the ML-NLFFI Library into an MLB file with
MLB file Description $(SML_LIB)/mlnlffi-lib/mlnlffi-lib.mlb -
If you are porting a project from SML/NJ's CompilationManager to MLton's ML Basis system using cm2mlb, note that the following maps are included by default:
$c/c.mlb $(SML_LIB)/mlnlffi-lib/mlnlffi-lib.mlb
This will automatically convert a $/c.cm import in an input .cm file into a $(SML_LIB)/mlnlffi-lib/mlnlffi-lib.mlb import in the output .mlb file.