| .Dd January 25, 2011 |
| .Dt ffi_prep_cif_var 3 |
| .Sh NAME |
| .Nm ffi_prep_cif_var |
| .Nd Prepare a |
| .Nm ffi_cif |
| structure for use with |
| .Nm ffi_call |
| for variadic functions. |
| .Sh 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 |
| .Sh DESCRIPTION |
| The |
| .Nm ffi_prep_cif_var |
| function prepares a |
| .Nm ffi_cif |
| structure for use with |
| .Nm 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 |
| .Nm ffi_type |
| structs that describe the data type, size and alignment of each argument. |
| .Fa rtype |
| points to an |
| .Nm 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 |
| .Nm ffi_prep_cif |
| must be used. |
| .Sh RETURN VALUES |
| Upon successful completion, |
| .Nm ffi_prep_cif_var |
| returns |
| .Nm FFI_OK . |
| It will return |
| .Nm FFI_BAD_TYPEDEF |
| if |
| .Fa cif |
| is |
| .Nm NULL |
| or |
| .Fa atypes |
| or |
| .Fa rtype |
| is malformed. If |
| .Fa abi |
| does not refer to a valid ABI, |
| .Nm FFI_BAD_ABI |
| will be returned. Available ABIs are |
| defined in |
| .Nm <ffitarget.h> |
| . |
| .Sh SEE ALSO |
| .Xr ffi 3 , |
| .Xr ffi_call 3 , |
| .Xr ffi_prep_cif 3 |
