.Dd July 20, 2007 .Dt FFI 3 .Os Darwin .Sh NAME .Nm FFI .Nd Foreign Function Interface .Sh LIBRARY libffi, -lffi .Sh SYNOPSIS .In ffi/ffi.h .Ft ffi_status .Fo ffi_prep_cif .Fa "ffi_cif *cif" .Fa "ffi_abi abi" .Fa "unsigned int nargs" .Fa "ffi_type *rtype" .Fa "ffi_type **atypes" .Fc .Ft ffi_status .Fo ffi_prep_closure .Fa "ffi_closure *closure" .Fa "ffi_cif *cif" .Fa "void (*fun)(ffi_cif*,void*,void**,void*)" .Fa "void *user_data" .Fc .Ft void .Fo ffi_call .Fa "ffi_cif *cif" .Fa "void (*fn)(void)" .Fa "void *rvalue" .Fa "void **avalue" .Fc .Sh DESCRIPTION The foreign function interface provides a mechanism by which a function can generate a call to another function at runtime without requiring knowledge of the called function's interface at compile time. .Sh SEE ALSO .Xr ffi_prep_cif 3 , .Xr ffi_prep_closure 3 , .Xr ffi_call 3