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74 lines
1.3 KiB
Groff
74 lines
1.3 KiB
Groff
.Dd January 25, 2011
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.Dt ffi_prep_cif_var 3
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.Sh NAME
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.Nm ffi_prep_cif_var
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.Nd Prepare a
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.Nm ffi_cif
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structure for use with
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.Nm ffi_call
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for variadic functions.
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.Sh SYNOPSIS
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.In ffi.h
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.Ft ffi_status
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.Fo ffi_prep_cif_var
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.Fa "ffi_cif *cif"
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.Fa "ffi_abi abi"
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.Fa "unsigned int nfixedargs"
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.Fa "unsigned int ntotalargs"
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.Fa "ffi_type *rtype"
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.Fa "ffi_type **atypes"
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.Fc
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.Sh DESCRIPTION
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The
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.Nm ffi_prep_cif_var
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function prepares a
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.Nm ffi_cif
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structure for use with
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.Nm ffi_call
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for variadic functions.
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.Fa abi
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specifies a set of calling conventions to use.
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.Fa atypes
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is an array of
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.Fa ntotalargs
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pointers to
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.Nm ffi_type
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structs that describe the data type, size and alignment of each argument.
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.Fa rtype
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points to an
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.Nm ffi_type
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that describes the data type, size and alignment of the
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return value.
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.Fa nfixedargs
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must contain the number of fixed (non-variadic) arguments.
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Note that to call a non-variadic function
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.Nm ffi_prep_cif
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must be used.
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.Sh RETURN VALUES
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Upon successful completion,
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.Nm ffi_prep_cif_var
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returns
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.Nm FFI_OK .
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It will return
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.Nm FFI_BAD_TYPEDEF
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if
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.Fa cif
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is
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.Nm NULL
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or
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.Fa atypes
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or
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.Fa rtype
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is malformed. If
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.Fa abi
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does not refer to a valid ABI,
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.Nm FFI_BAD_ABI
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will be returned. Available ABIs are
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defined in
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.Nm <ffitarget.h>
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.
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.Sh SEE ALSO
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.Xr ffi 3 ,
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.Xr ffi_call 3 ,
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.Xr ffi_prep_cif 3
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