7 Unexported Primitive Functions
Parts of the ffi/unsafe library are implemented by the Racket built-in '#%foreign module. The '#%foreign module is not intended for direct use, but it exports the following procedures (among others).
Pulls out a foreign object from a library, returning a value
that can be used as a C pointer. If lib is a path or string,
then ffi-lib is used to create a library object.
procedure
x : any/c (ffi-obj-lib obj) → ffi-lib? obj : ffi-obj? (ffi-obj-name obj) → string? obj : ffi-obj?
A predicate for objects returned by ffi-obj, and accessor
functions that return its corresponding library object and name.
These values can also be used as C pointer objects.
procedure
(ctype-basetype type) → (or/c ctype? #f)
type : ctype? (ctype-scheme->c type) → procedure? type : ctype? (ctype-c->scheme type) → procedure? type : ctype?
Accessors for the components of a C type object, made by
make-ctype. The ctype-basetype selector returns a
symbol for primitive types that names the type, a list of ctypes for
cstructs, and another ctype for user-defined ctypes.
procedure
(ffi-call ptr in-types out-type [ abi] save-errno? orig-place?) → procedure? ptr : cpointer? in-types : (listof ctype?) out-type : ctype? abi : (or/c #f 'default 'stdcall 'sysv) = #f save-errno? : any/c orig-place? : any/c
The primitive mechanism that creates Racket “callout” values for
_cprocedure. The given ptr is wrapped in a
Racket-callable primitive function that uses the types to specify how
values are marshaled.
procedure
(ffi-callback proc in-types out-type [ abi atomic? async-apply]) → ffi-callback? proc : any/c in-types : any/c out-type : any/c abi : (or/c #f 'default 'stdcall 'sysv) = #f atomic? : any/c = #f async-apply : (or/c #f ((-> any) . -> . any)) = #f
The symmetric counterpart of ffi-call. It receives a Racket
procedure and creates a callback object, which can also be used as a
C pointer.
procedure
(ffi-callback? x) → boolean?
x : any/c
A predicate for callback values that are created by ffi-callback.