ffi_prep_cif_var – Prepare a ffi_cif structure for use with ffi_call for variadic functions.
Synopsis
In ffi.h Ft ffi_status Fo ffi_prep_cif_var Fa ffi_cif *cif Fa ffi_abi abi Fa unsigned int nfixedargs Fa unsigned int ntotalargs Fa ffi_type *rtype Fa ffi_type **atypes Fc
Description
The
ffi_prep_cif_var function prepares a
ffi_cif structure for use with
ffi_call for variadic functions. Fa abi specifies a set of calling conventions to use. Fa atypes is an array of Fa ntotalargs pointers to
ffi_type structs that describe the data type, size and alignment of each argument. Fa rtype points to an
ffi_type that describes the data type, size and alignment of the return value. Fa nfixedargs must contain the number of fixed (non-variadic) arguments. Note that to call a non-variadic function
ffi_prep_cif must be used.
Return Values
Upon successful completion,
ffi_prep_cif_var returns
FFI_OK It will return
FFI_BAD_TYPEDEF if Fa cif is
NULL or Fa atypes or Fa rtype is malformed. If Fa abi does not refer to a valid ABI,
FFI_BAD_ABI will be returned. Available ABIs are defined in
<ffitarget.h>
See Also
ffi(3), ffi_call3, ffi_prep_cif3
