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Code Editor : Primitive-Types.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for libffi, a portable foreign function interface library. Copyright (C) 2008-2019, 2021 Anthony Green and Red Hat, Inc. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --> <title>Primitive Types (libffi: the portable foreign function interface library)</title> <meta name="description" content="Primitive Types (libffi: the portable foreign function interface library)"> <meta name="keywords" content="Primitive Types (libffi: the portable foreign function interface library)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta name="viewport" content="width=device-width,initial-scale=1"> <link href="index.html" rel="start" title="Top"> <link href="Index.html" rel="index" title="Index"> <link href="Types.html" rel="up" title="Types"> <link href="Structures.html" rel="next" title="Structures"> <style type="text/css"> <!-- a.copiable-anchor {visibility: hidden; text-decoration: none; line-height: 0em} a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} span:hover a.copiable-anchor {visibility: visible} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <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> </div> <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> <hr> <div class="header"> <p> Next: <a href="Structures.html">Structures</a>, Up: <a href="Types.html">Types</a> [<a href="Index.html" title="Index" rel="index">Index</a>]</p> </div> </body> </html>
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