120 lines
4.2 KiB
HTML
120 lines
4.2 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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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>Linking Guile into Programs (Guile Reference Manual)</title>
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<div class="section-level-extent" id="Linking-Guile-into-Programs">
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Next: <a href="Writing-Guile-Extensions.html" accesskey="n" rel="next">Writing Guile Extensions</a>, Previous: <a href="Running-Guile-Scripts.html" accesskey="p" rel="prev">Running Guile Scripts</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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<hr>
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<h3 class="section subsection-level-set-section" id="Linking-Guile-into-Programs-1"><span>2.3 Linking Guile into Programs<a class="copiable-link" href="#Linking-Guile-into-Programs-1"> ¶</a></span></h3>
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<p>The Guile interpreter is available as an object library, to be linked
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into applications using Scheme as a configuration or extension
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language.
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</p>
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<p>Here is <samp class="file">simple-guile.c</samp>, source code for a program that will
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produce a complete Guile interpreter. In addition to all usual
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functions provided by Guile, it will also offer the function
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<code class="code">my-hostname</code>.
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</p>
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<div class="example">
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<pre class="example-preformatted">#include <stdlib.h>
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#include <libguile.h>
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static SCM
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my_hostname (void)
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{
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char *s = getenv ("HOSTNAME");
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if (s == NULL)
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return SCM_BOOL_F;
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else
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return scm_from_locale_string (s);
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}
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static void
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inner_main (void *data, int argc, char **argv)
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{
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scm_c_define_gsubr ("my-hostname", 0, 0, 0, my_hostname);
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scm_shell (argc, argv);
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}
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int
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main (int argc, char **argv)
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{
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scm_boot_guile (argc, argv, inner_main, 0);
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return 0; /* never reached */
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}
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</pre></div>
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<p>When Guile is correctly installed on your system, the above program
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can be compiled and linked like this:
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</p>
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<div class="example">
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<pre class="example-preformatted">$ gcc -o simple-guile simple-guile.c \
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`pkg-config --cflags --libs guile-3.0`
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</pre></div>
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<p>When it is run, it behaves just like the <code class="code">guile</code> program except
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that you can also call the new <code class="code">my-hostname</code> function.
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</p>
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<div class="example">
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<pre class="example-preformatted">$ ./simple-guile
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scheme@(guile-user)> (+ 1 2 3)
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$1 = 6
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scheme@(guile-user)> (my-hostname)
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"burns"
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</pre></div>
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</div>
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