ffi_prep_cif_var(3) Introduction to Library Functions ffi_prep_cif_var(3)

NAME

ffi_prep_cif_var - Prepare a ffi_cif structure for use with ffi_call
for variadic functions.

SYNOPSIS

#include <ffi.h>

ffi_status
ffi_prep_cif_var(ffi_cif *cif, ffi_abi abi, unsigned int nfixedargs,
unsigned int ntotalargs, ffi_type *rtype, ffi_type **atypes);

DESCRIPTION

The ffi_prep_cif_var function prepares a ffi_cif structure for use with
ffi_call for variadic functions. abi specifies a set of calling
conventions to use. atypes is an array of ntotalargs pointers to
ffi_type structs that describe the data type, size and alignment of
each argument. rtype points to an ffi_type that describes the data
type, size and alignment of the return value. 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 cif is NULL or atypes or rtype is malformed.
If 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_call(3), ffi_prep_cif(3)

January 25, 2011