115 lines
4.5 KiB
HTML
115 lines
4.5 KiB
HTML
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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<title>Writing Guile Extensions (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Hello-Guile_0021.html" rel="up" title="Hello Guile!">
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<link href="Using-the-Guile-Module-System.html" rel="next" title="Using the Guile Module System">
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<div class="section-level-extent" id="Writing-Guile-Extensions">
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<p>
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Next: <a href="Using-the-Guile-Module-System.html" accesskey="n" rel="next">Using the Guile Module System</a>, Previous: <a href="Linking-Guile-into-Programs.html" accesskey="p" rel="prev">Linking Guile into Programs</a>, Up: <a href="Hello-Guile_0021.html" accesskey="u" rel="up">Hello Guile!</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h3 class="section subsection-level-set-section" id="Writing-Guile-Extensions-1"><span>2.4 Writing Guile Extensions<a class="copiable-link" href="#Writing-Guile-Extensions-1"> ¶</a></span></h3>
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<p>You can link Guile into your program and make Scheme available to the
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users of your program. You can also link your library into Guile and
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make its functionality available to all users of Guile.
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</p>
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<p>A library that is linked into Guile is called an <em class="dfn">extension</em>, but it
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really just is an ordinary object library.
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</p>
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<p>The following example shows how to write a simple extension for Guile
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that makes the <code class="code">j0</code> function available to Scheme code.
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</p>
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<div class="example smallexample">
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<pre class="example-preformatted">#include <math.h>
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#include <libguile.h>
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SCM
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j0_wrapper (SCM x)
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{
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return scm_from_double (j0 (scm_to_double (x)));
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}
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void
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init_bessel ()
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{
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scm_c_define_gsubr ("j0", 1, 0, 0, j0_wrapper);
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}
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</pre></div>
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<p>This C source file needs to be compiled into a shared library. Here is
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how to do it on GNU/Linux:
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</p>
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<div class="example smallexample">
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<pre class="example-preformatted">gcc `pkg-config --cflags guile-3.0` \
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-shared -o libguile-bessel.so -fPIC bessel.c
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</pre></div>
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<p>For creating shared libraries portably, we recommend the use of GNU
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Libtool (see <a data-manual="libtool" href="https://www.gnu.org/software/libtool/manual/html_node/index.html#Top">Introduction</a> in <cite class="cite">GNU Libtool</cite>).
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</p>
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<p>A shared library can be loaded into a running Guile process with the
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function <code class="code">load-extension</code>. The <code class="code">j0</code> is then immediately
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available:
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</p>
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<div class="example smallexample">
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<pre class="example-preformatted">$ guile
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scheme@(guile-user)> (load-extension "./libguile-bessel" "init_bessel")
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scheme@(guile-user)> (j0 2)
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$1 = 0.223890779141236
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</pre></div>
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<p>For more on how to install your extension, see <a class="pxref" href="Installing-Site-Packages.html">Installing Site Packages</a>.
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</p>
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</div>
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</body>
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