ffi_prep_cif_var (3)

NAME

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