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<div class="refentry">
<a name="libfm-FmModule"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libfm-FmModule.top_of_page"></a>FmModule</span></h2>
<p>FmModule — Simple external modules handler.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libfm-FmModule.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#CHECK-MODULES:CAPS" title="CHECK_MODULES()">CHECK_MODULES</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#FM-DEFINE-MODULE:CAPS" title="FM_DEFINE_MODULE()">FM_DEFINE_MODULE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#FM-MODULE-DEFINE-TYPE:CAPS" title="FM_MODULE_DEFINE_TYPE()">FM_MODULE_DEFINE_TYPE</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="libfm-FmModule.html#FmModuleInitCallback" title="FmModuleInitCallback ()">*FmModuleInitCallback</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#fm-module-is-in-use" title="fm_module_is_in_use ()">fm_module_is_in_use</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#fm-module-register-type" title="fm_module_register_type ()">fm_module_register_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#fm-module-unregister-type" title="fm_module_unregister_type ()">fm_module_unregister_type</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#fm-modules-add-directory" title="fm_modules_add_directory ()">fm_modules_add_directory</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libfm-FmModule.html#fm-modules-load" title="fm_modules_load ()">fm_modules_load</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libfm-FmModule.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="libfm-FmModule.description"></a><h2>Description</h2>
<p><em class="parameter"><code>include</code></em>
: libfm/fm.h</p>
<p>This implementation allows applications to use external modules and
select which ones application wants to use (from none to all).</p>
<p>The naming scheme in examples below is strict. Replace "dummy" part in
them with your real name when you trying to use those examples. Those
strict example names are:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>FM_MODULE_dummy_VERSION</p></li>
<li class="listitem"><p>fm_module_init_dummy</p></li>
<li class="listitem"><p>fm_module_callback_dummy</p></li>
<li class="listitem"><p>fm_module_register_dummy</p></li>
</ul></div>
<p>To use modules application should make few things. Let say, there is
some FmDummyWidget which wants to use "dummy" type of modules. First
thing application should do is create a header file which all modules
of that type should include:</p>
<div class="example">
<a name="example-fm-dummy-h"></a><p class="title"><b>Example 1. Sample of fm-dummy.h</b></p>
<div class="example-contents"><pre class="programlisting">
#include <libfm/fm.h>
#define FM_MODULE_dummy_VERSION 1
typedef struct _FmDummyInit {
int (*get_new)(const char *name);
} FmDummyInit;
extern FmDummyInit fm_module_init_dummy;
</pre></div>
</div>
<br class="example-break"><p>The FM_MODULE_dummy_VERSION is a number which should be increased each
time something in FmDummyInit structure is changed. The FmDummyInit
represents an interface to module. It is specific for said module type.
The fm_module_init_dummy usage see below.</p>
<p>Second thing application should do is to create implementation of the
module handling in your code:</p>
<div class="example">
<a name="example-fm-dummy-widget-c"></a><p class="title"><b>Example 2. Sample of fm-dummy-widget.c</b></p>
<div class="example-contents"><pre class="programlisting">
#include "fm-dummy.h"
FM_MODULE_DEFINE_TYPE(dummy, FmDummyInit, 1)
static gboolean fm_module_callback_dummy(const char *name, gpointer init, int ver)
{
/* add module callbacks into own data list */
.......
}
.......
{
FmDummyInit *module;
int result = -1;
CHECK_MODULES();
module = _find_module("test");
if (module)
result = module->get_new("test sample");
return result;
}
</pre></div>
</div>
<br class="example-break"><p>Third thing application should do is to register module type on the
application start, the same way as application calls <a class="link" href="libfm-Libfm.html#fm-init" title="fm_init ()"><code class="function">fm_init()</code></a> on the
start:</p>
<div class="informalexample"><pre class="programlisting">
fm_module_register_dummy();
</pre></div>
<p>
On application terminate it is adviced to unregister module type by
calling API <a class="link" href="libfm-FmModule.html#fm-module-unregister-type" title="fm_module_unregister_type ()"><code class="function">fm_module_unregister_type()</code></a> the same way as application
calls <a class="link" href="libfm-Libfm.html#fm-finalize" title="fm_finalize ()"><code class="function">fm_finalize()</code></a> on exit:</p>
<div class="informalexample"><pre class="programlisting">
fm_module_unregister_type("dummy");
</pre></div>
<p></p>
<p>The module itself will be easy to make. All you should do is to use
<a class="link" href="libfm-FmModule.html#FM-DEFINE-MODULE:CAPS" title="FM_DEFINE_MODULE()"><code class="function">FM_DEFINE_MODULE()</code></a> macro and implement callbacks for the module
interface (see the fm-dummy.h header example above):</p>
<div class="example">
<a name="example-fm-dummy-test-c"></a><p class="title"><b>Example 3. Sample of module dummy/test</b></p>
<div class="example-contents"><pre class="programlisting">
#include "fm-dummy.h"
FM_DEFINE_MODULE(dummy, test)
static int fm_dummy_test_get_new(const char *name)
{
/* implementation */
}
FmDummyInit fm_module_init_dummy = {
fm_dummy_test_get_new;
};
</pre></div>
</div>
<br class="example-break"><p>The fm_module_init_dummy should be exactly the same structure that is
defined in the header file above.</p>
<p>Note that modules are scanned and loaded only once per application
run for simplicity and reliability reasons (in fact, deletion of a
module that have some code running in another thread may lead to some
unpredictable problems). Therefore if you have any module changed you
have to restart the application before it see your change.</p>
</div>
<div class="refsect1">
<a name="libfm-FmModule.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="CHECK-MODULES:CAPS"></a><h3>CHECK_MODULES()</h3>
<pre class="programlisting">#define CHECK_MODULES(...) if(G_UNLIKELY(!fm_modules_loaded)) fm_modules_load()
</pre>
</div>
<hr>
<div class="refsect2">
<a name="FM-DEFINE-MODULE:CAPS"></a><h3>FM_DEFINE_MODULE()</h3>
<pre class="programlisting">#define FM_DEFINE_MODULE(_type_, _name_)</pre>
<p>Macro used in module definition. Module should have module specific
structure: if <em class="parameter"><code>type</code></em>
is vfs then it should be fm_module_init_vfs. See
specific header file for some `extern' definition.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>_type_</p></td>
<td class="parameter_description"><p>type of module (e.g. `vfs')</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>_name_</p></td>
<td class="parameter_description"><p>module type specific key (e.g. `menu')</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="FM-MODULE-DEFINE-TYPE:CAPS"></a><h3>FM_MODULE_DEFINE_TYPE()</h3>
<pre class="programlisting">#define FM_MODULE_DEFINE_TYPE(_type_, _struct_, _minver_)</pre>
<p>Macro used in module caller. Callback is ran when matched module is
found, it should return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on success.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>_type_</p></td>
<td class="parameter_description"><p>type of module (e.g. `vfs')</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>_struct_</p></td>
<td class="parameter_description"><p>type of struct with module callbacks</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>_minver_</p></td>
<td class="parameter_description"><p>minimum version supported</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="FmModuleInitCallback"></a><h3>FmModuleInitCallback ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
<span class="c_punctuation">(</span>*FmModuleInitCallback<span class="c_punctuation">)</span> (<em class="parameter"><code>const <span class="type">char</span> *key</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> init_data</code></em>,
<em class="parameter"><code><span class="type">int</span> version</code></em>);</pre>
<p>This API is used to make callback from the modules loader to the
implementation which uses module so the implementation may do required
checks and add module to own list of supported data.
This callback will be done in default main context.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>key</p></td>
<td class="parameter_description"><p>the module name as key value for the type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>init_data</p></td>
<td class="parameter_description"><p>module type specific initialization data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>version</p></td>
<td class="parameter_description"><p>version of loaded module</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.3.23.6.5.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if module was accepted by implementation.</p>
<p></p>
</div>
<p class="since">Since 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-module-is-in-use"></a><h3>fm_module_is_in_use ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
fm_module_is_in_use (<em class="parameter"><code>const <span class="type">char</span> *type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *name</code></em>);</pre>
<p>Checks if specified module is found and successfully loaded.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>module type</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p> module key. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.3.23.6.6.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if module is in use.</p>
<p></p>
</div>
<p class="since">Since 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-module-register-type"></a><h3>fm_module_register_type ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
fm_module_register_type (<em class="parameter"><code>const <span class="type">char</span> *type</code></em>,
<em class="parameter"><code><span class="type">int</span> minver</code></em>,
<em class="parameter"><code><span class="type">int</span> maxver</code></em>,
<em class="parameter"><code><a class="link" href="libfm-FmModule.html#FmModuleInitCallback" title="FmModuleInitCallback ()"><span class="type">FmModuleInitCallback</span></a> cb</code></em>);</pre>
<p>Registers <em class="parameter"><code>type</code></em>
into the modules loader. The modules loader will call
<em class="parameter"><code>cb</code></em>
routine when module that supports the <em class="parameter"><code>type</code></em>
was found within the
libfm modules directory. The scanning for modules will be done after
some timeout after last call to <a class="link" href="libfm-FmModule.html#fm-module-register-type" title="fm_module_register_type ()"><code class="function">fm_module_register_type()</code></a> so this API
should be used at application start before any possible modules usage
may appear.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>module type, unique for the application</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>minver</p></td>
<td class="parameter_description"><p>minimum supported module version</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>maxver</p></td>
<td class="parameter_description"><p>maximum supported module version</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cb</p></td>
<td class="parameter_description"><p>the callback used to inform about found module</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-module-unregister-type"></a><h3>fm_module_unregister_type ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
fm_module_unregister_type (<em class="parameter"><code>const <span class="type">char</span> *type</code></em>);</pre>
<p>Frees any resources that were allocated previously on the call to
<a class="link" href="libfm-FmModule.html#fm-module-register-type" title="fm_module_register_type ()"><code class="function">fm_module_register_type()</code></a> API, including code of the modules. After
this call any usage of data from callbacks will be invalid and the
most possibly lead to crash so it might be called only on finalizing
the application data.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>type</p></td>
<td class="parameter_description"><p>module type, unique for the application</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-modules-add-directory"></a><h3>fm_modules_add_directory ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
fm_modules_add_directory (<em class="parameter"><code>const <span class="type">char</span> *path</code></em>);</pre>
<p>Adds an application-specific directory <em class="parameter"><code>path</code></em>
to be used later for
scanning for modules. The <em class="parameter"><code>path</code></em>
should be absolute UNIX path.</p>
<div class="refsect3">
<a name="id-1.2.3.23.6.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>path</p></td>
<td class="parameter_description"><p>absolute path to modules directory</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.3.23.6.9.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>path</code></em>
was added successfully.</p>
<p></p>
</div>
<p class="since">Since 1.2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="fm-modules-load"></a><h3>fm_modules_load ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
fm_modules_load (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Forces scanning the libfm modules for existing modules. Any calls to
<a class="link" href="libfm-FmModule.html#fm-module-register-type" title="fm_module_register_type ()"><code class="function">fm_module_register_type()</code></a> after this will have no effect.</p>
<p class="since">Since 1.2.0</p>
</div>
</div>
<div class="refsect1">
<a name="libfm-FmModule.other_details"></a><h2>Types and Values</h2>
</div>
</div>
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