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1 .Dd January 25, 2011
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2 .Dt ffi_prep_cif_var 3
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3 .Sh NAME
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4 .Nm ffi_prep_cif_var
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5 .Nd Prepare a
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6 .Nm ffi_cif
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7 structure for use with
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8 .Nm ffi_call
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9 for variadic functions.
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10 .Sh SYNOPSIS
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11 .In ffi.h
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12 .Ft ffi_status
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13 .Fo ffi_prep_cif_var
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14 .Fa "ffi_cif *cif"
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15 .Fa "ffi_abi abi"
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16 .Fa "unsigned int nfixedargs"
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17 .Fa "unsigned int ntotalargs"
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18 .Fa "ffi_type *rtype"
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19 .Fa "ffi_type **atypes"
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20 .Fc
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21 .Sh DESCRIPTION
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22 The
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23 .Nm ffi_prep_cif_var
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24 function prepares a
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25 .Nm ffi_cif
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26 structure for use with
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27 .Nm ffi_call
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28 for variadic functions.
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29 .Fa abi
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30 specifies a set of calling conventions to use.
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31 .Fa atypes
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32 is an array of
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33 .Fa ntotalargs
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34 pointers to
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35 .Nm ffi_type
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36 structs that describe the data type, size and alignment of each argument.
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37 .Fa rtype
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38 points to an
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39 .Nm ffi_type
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40 that describes the data type, size and alignment of the
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41 return value.
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42 .Fa nfixedargs
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43 must contain the number of fixed (non-variadic) arguments.
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44 Note that to call a non-variadic function
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45 .Nm ffi_prep_cif
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46 must be used.
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47 .Sh RETURN VALUES
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48 Upon successful completion,
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49 .Nm ffi_prep_cif_var
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50 returns
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51 .Nm FFI_OK .
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52 It will return
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53 .Nm FFI_BAD_TYPEDEF
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54 if
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55 .Fa cif
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56 is
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57 .Nm NULL
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58 or
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59 .Fa atypes
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60 or
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61 .Fa rtype
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62 is malformed. If
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63 .Fa abi
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64 does not refer to a valid ABI,
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65 .Nm FFI_BAD_ABI
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66 will be returned. Available ABIs are
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67 defined in
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68 .Nm <ffitarget.h>
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69 .
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70 .Sh SEE ALSO
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71 .Xr ffi 3 ,
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72 .Xr ffi_call 3 ,
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73 .Xr ffi_prep_cif 3
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