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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#libxfce4util-POSIX-Signal-Handling.synopsis" class="shortcut">Top</a>
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                  <a href="#libxfce4util-POSIX-Signal-Handling.description" class="shortcut">Description</a>
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<a name="libxfce4util-POSIX-Signal-Handling"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="libxfce4util-POSIX-Signal-Handling.top_of_page"></a>POSIX Signal Handling</span></h2>
<p>POSIX Signal Handling — a callback system for handling POSIX signals safely</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="libxfce4util-POSIX-Signal-Handling.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;libxfce4util/libxfce4util.h&gt;

<span class="returnvalue">void</span>                (<a class="link" href="libxfce4util-POSIX-Signal-Handling.html#XfcePosixSignalHandler" title="XfcePosixSignalHandler ()">*XfcePosixSignalHandler</a>)           (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> signal</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libxfce4util-POSIX-Signal-Handling.html#xfce-posix-signal-handler-init" title="xfce_posix_signal_handler_init ()">xfce_posix_signal_handler_init</a>      (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libxfce4util-POSIX-Signal-Handling.html#xfce-posix-signal-handler-restore-handler" title="xfce_posix_signal_handler_restore_handler ()">xfce_posix_signal_handler_restore_handler</a>
                                                        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> signal</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libxfce4util-POSIX-Signal-Handling.html#xfce-posix-signal-handler-set-handler" title="xfce_posix_signal_handler_set_handler ()">xfce_posix_signal_handler_set_handler</a>
                                                        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> signal</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libxfce4util-POSIX-Signal-Handling.html#XfcePosixSignalHandler" title="XfcePosixSignalHandler ()"><span class="type">XfcePosixSignalHandler</span></a> handler</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libxfce4util-POSIX-Signal-Handling.html#xfce-posix-signal-handler-shutdown" title="xfce_posix_signal_handler_shutdown ()">xfce_posix_signal_handler_shutdown</a>  (<em class="parameter"><code><span class="type">void</span></code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libxfce4util-POSIX-Signal-Handling.description"></a><h2>Description</h2>
<p>
Due to reentrancy issues, there is a restricted set of functions/syscalls
that are allowed to be performed inside a POSIX signal handler.  In
general, it's safer to defer any signal-related processing until after the
signal handler has run.  The functionality in this module automatically
handles this, and allows you to set a handler function (with optional user
data) for any signal.
</p>
</div>
<div class="refsect1">
<a name="libxfce4util-POSIX-Signal-Handling.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="XfcePosixSignalHandler"></a><h3>XfcePosixSignalHandler ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                (*XfcePosixSignalHandler)           (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> signal</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
A function signature to use for POSIX signal handler functions.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>signal</code></em> :</span></p></td>
<td>The signal that was caught.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>The <em class="parameter"><code>user_data</code></em> parameter passed when the handler was registered.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="xfce-posix-signal-handler-init"></a><h3>xfce_posix_signal_handler_init ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            xfce_posix_signal_handler_init      (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Initializes the POSIX signal handler system.  Must be called
before setting any POSIX signal handlers.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
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<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Location of a <a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> to store any possible errors.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> on failure, in which case
<em class="parameter"><code>error</code></em> will be set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="xfce-posix-signal-handler-restore-handler"></a><h3>xfce_posix_signal_handler_restore_handler ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                xfce_posix_signal_handler_restore_handler
                                                        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> signal</code></em>);</pre>
<p>
Restores the default handler for <em class="parameter"><code>signal</code></em>.
</p>
</div>
<hr>
<div class="refsect2">
<a name="xfce-posix-signal-handler-set-handler"></a><h3>xfce_posix_signal_handler_set_handler ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            xfce_posix_signal_handler_set_handler
                                                        (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> signal</code></em>,
                                                         <em class="parameter"><code><a class="link" href="libxfce4util-POSIX-Signal-Handling.html#XfcePosixSignalHandler" title="XfcePosixSignalHandler ()"><span class="type">XfcePosixSignalHandler</span></a> handler</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Sets <em class="parameter"><code>handler</code></em> to be called whenever <em class="parameter"><code>signal</code></em> is caught by the
application.  The <em class="parameter"><code>user_data</code></em> parameter will be passed as an argument
to <em class="parameter"><code>handler</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>handler</code></em> :</span></p></td>
<td>A callback function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>Arbitrary data that will be passed to <em class="parameter"><code>handler</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Location of a <a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> to store any possible errors.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on success, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise, in which case
<em class="parameter"><code>error</code></em> will be set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="xfce-posix-signal-handler-shutdown"></a><h3>xfce_posix_signal_handler_shutdown ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                xfce_posix_signal_handler_shutdown  (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Frees all memory associated with the POSIX signal handling system
and restores all default signal handlers.
</p>
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