Foreign

#

val foreign : ?abi:Libffi_abi.abi -> ?from:Dl.library -> ?stub:bool -> ?check_errno:bool -> string -> ('a -> 'b) Ctypes.fn -> 'a -> 'b

foreign name typ exposes the C function of type typ named by name as an OCaml value.

The argument ?from, if supplied, is a library handle returned by Dl.dlopen.

The argument ?stub, if true (defaults to false), indicates that the function should not raise an exception if name is not found but return an OCaml value that raises an exception when called.

The value ?check_errno, which defaults to false, indicates whether Unix.Unix_error should be raised if the C function modifies errno.

Raises Dl.DL_error if name is not found in ?from and ?stub is false.

#

val foreign_value : ?from:Dl.library -> string -> 'a Ctypes.typ -> 'a Ctypes.ptr

foreign_value name typ exposes the C value of type typ named by name as an OCaml value. The argument ?from, if supplied, is a library handle returned by Dl.dlopen.

#

val funptr : ?abi:Libffi_abi.abi -> ?name:string -> ?check_errno:bool -> ('a -> 'b) Ctypes.fn -> ('a -> 'b) Ctypes.typ

Construct a function pointer type from a function type.

The ctypes library, like C itself, distinguishes functions and function pointers. Functions are not first class: it is not possible to use them as arguments or return values of calls, or store them in addressable memory. Function pointers are first class, and so have none of these restrictions.

The value ?check_errno, which defaults to false, indicates whether Unix.Unix_error should be raised if the C function modifies errno.

#

val funptr_opt : ?abi:Libffi_abi.abi -> ('a -> 'b) Ctypes.fn -> ('a -> 'b) option Ctypes.typ

Construct a function pointer type from a function type.

This behaves like funptr, except that null pointers appear in OCaml as None.

#

exception CallToExpiredClosure

A closure passed to C was collected by the OCaml garbage collector before it was called.

module Foreign