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<title>Primitive Types (libffi: the portable foreign function interface library)</title>
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<div class="subsection" id="Primitive-Types">
<div class="header">
<p>
Next: <a href="Structures.html" accesskey="n" rel="next">Structures</a>, Up: <a href="Types.html" accesskey="u" rel="up">Types</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
<span id="Primitive-Types-1"></span><h4 class="subsection">2.3.1 Primitive Types</h4>
<p><code>Libffi</code> provides a number of built-in type descriptors that can
be used to describe argument and return types:
</p>
<dl compact="compact">
<dt id='index-ffi_005ftype_005fvoid'><span><code>ffi_type_void</code><a href='#index-ffi_005ftype_005fvoid' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The type <code>void</code>. This cannot be used for argument types, only
for return values.
</p>
</dd>
<dt id='index-ffi_005ftype_005fuint8'><span><code>ffi_type_uint8</code><a href='#index-ffi_005ftype_005fuint8' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>An unsigned, 8-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fsint8'><span><code>ffi_type_sint8</code><a href='#index-ffi_005ftype_005fsint8' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>A signed, 8-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fuint16'><span><code>ffi_type_uint16</code><a href='#index-ffi_005ftype_005fuint16' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>An unsigned, 16-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fsint16'><span><code>ffi_type_sint16</code><a href='#index-ffi_005ftype_005fsint16' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>A signed, 16-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fuint32'><span><code>ffi_type_uint32</code><a href='#index-ffi_005ftype_005fuint32' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>An unsigned, 32-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fsint32'><span><code>ffi_type_sint32</code><a href='#index-ffi_005ftype_005fsint32' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>A signed, 32-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fuint64'><span><code>ffi_type_uint64</code><a href='#index-ffi_005ftype_005fuint64' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>An unsigned, 64-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fsint64'><span><code>ffi_type_sint64</code><a href='#index-ffi_005ftype_005fsint64' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>A signed, 64-bit integer type.
</p>
</dd>
<dt id='index-ffi_005ftype_005ffloat'><span><code>ffi_type_float</code><a href='#index-ffi_005ftype_005ffloat' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>float</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fdouble'><span><code>ffi_type_double</code><a href='#index-ffi_005ftype_005fdouble' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>double</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fuchar'><span><code>ffi_type_uchar</code><a href='#index-ffi_005ftype_005fuchar' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>unsigned char</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fschar'><span><code>ffi_type_schar</code><a href='#index-ffi_005ftype_005fschar' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>signed char</code> type. (Note that there is not an exact
equivalent to the C <code>char</code> type in <code>libffi</code>; ordinarily you
should either use <code>ffi_type_schar</code> or <code>ffi_type_uchar</code>
depending on whether <code>char</code> is signed.)
</p>
</dd>
<dt id='index-ffi_005ftype_005fushort'><span><code>ffi_type_ushort</code><a href='#index-ffi_005ftype_005fushort' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>unsigned short</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fsshort'><span><code>ffi_type_sshort</code><a href='#index-ffi_005ftype_005fsshort' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>short</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fuint'><span><code>ffi_type_uint</code><a href='#index-ffi_005ftype_005fuint' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>unsigned int</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fsint'><span><code>ffi_type_sint</code><a href='#index-ffi_005ftype_005fsint' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>int</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fulong'><span><code>ffi_type_ulong</code><a href='#index-ffi_005ftype_005fulong' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>unsigned long</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fslong'><span><code>ffi_type_slong</code><a href='#index-ffi_005ftype_005fslong' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>long</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005flongdouble'><span><code>ffi_type_longdouble</code><a href='#index-ffi_005ftype_005flongdouble' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>On platforms that have a C <code>long double</code> type, this is defined.
On other platforms, it is not.
</p>
</dd>
<dt id='index-ffi_005ftype_005fpointer'><span><code>ffi_type_pointer</code><a href='#index-ffi_005ftype_005fpointer' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>A generic <code>void *</code> pointer. You should use this for all
pointers, regardless of their real type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fcomplex_005ffloat'><span><code>ffi_type_complex_float</code><a href='#index-ffi_005ftype_005fcomplex_005ffloat' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>_Complex float</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fcomplex_005fdouble'><span><code>ffi_type_complex_double</code><a href='#index-ffi_005ftype_005fcomplex_005fdouble' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>_Complex double</code> type.
</p>
</dd>
<dt id='index-ffi_005ftype_005fcomplex_005flongdouble'><span><code>ffi_type_complex_longdouble</code><a href='#index-ffi_005ftype_005fcomplex_005flongdouble' class='copiable-anchor'> ¶</a></span></dt>
<dd><p>The C <code>_Complex long double</code> type.
On platforms that have a C <code>long double</code> type, this is defined.
On other platforms, it is not.
</p></dd>
</dl>
<p>Each of these is of type <code>ffi_type</code>, so you must take the address
when passing to <code>ffi_prep_cif</code>.
</p>
</div>
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