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<tr><td colspan="5" class="shortcuts"><nobr><a href="#id2975383" class="shortcut">Top</a>
 | 
<a href="#id2975810" class="shortcut">Description</a></nobr></td></tr>
</table>
<div class="refentry" lang="en">
<a name="glib-Message-Logging"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2>
<a name="id2975383"></a><span class="refentrytitle">Message Logging</span>
</h2>
<p>Message Logging — versatile support for logging messages with different levels of importance.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">
#include <glib.h>
#define <a href="glib-Message-Logging.html#G-LOG-DOMAIN:CAPS">G_LOG_DOMAIN</a>
#define <a href="glib-Message-Logging.html#G-LOG-FATAL-MASK:CAPS">G_LOG_FATAL_MASK</a>
#define <a href="glib-Message-Logging.html#G-LOG-LEVEL-USER-SHIFT:CAPS">G_LOG_LEVEL_USER_SHIFT</a>
void (<a href="glib-Message-Logging.html#GLogFunc">*GLogFunc</a>) (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *message,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);
enum <a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a>;
void <a href="glib-Message-Logging.html#g-log">g_log</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *format,
...);
void <a href="glib-Message-Logging.html#g-logv">g_logv</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *format,
va_list args);
#define <a href="glib-Message-Logging.html#g-message">g_message</a> (...)
#define <a href="glib-Message-Logging.html#g-warning">g_warning</a> (...)
#define <a href="glib-Message-Logging.html#g-critical">g_critical</a> (...)
#define <a href="glib-Message-Logging.html#g-error">g_error</a> (...)
#define <a href="glib-Message-Logging.html#g-debug">g_debug</a> (...)
<a href="glib-Basic-Types.html#guint">guint</a> <a href="glib-Message-Logging.html#g-log-set-handler">g_log_set_handler</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_levels,
<a href="glib-Message-Logging.html#GLogFunc">GLogFunc</a> log_func,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);
void <a href="glib-Message-Logging.html#g-log-remove-handler">g_log_remove_handler</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Basic-Types.html#guint">guint</a> handler_id);
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> <a href="glib-Message-Logging.html#g-log-set-always-fatal">g_log_set_always_fatal</a> (<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> fatal_mask);
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> <a href="glib-Message-Logging.html#g-log-set-fatal-mask">g_log_set_fatal_mask</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> fatal_mask);
void <a href="glib-Message-Logging.html#g-log-default-handler">g_log_default_handler</a> (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *message,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> unused_data);
<a href="glib-Message-Logging.html#GLogFunc">GLogFunc</a> <a href="glib-Message-Logging.html#g-log-set-default-handler">g_log_set_default_handler</a> (<a href="glib-Message-Logging.html#GLogFunc">GLogFunc</a> log_func,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="id2975810"></a><h2>Description</h2>
<p>
These functions provide support for logging error messages or messages
used for debugging.
</p>
<p>
There are several built-in levels of messages, defined in <a href="glib-Message-Logging.html#GLogLevelFlags"><span class="type">GLogLevelFlags</span></a>.
These can be extended with user-defined levels.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2975840"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="id2975850"></a><h3>
<a name="G-LOG-DOMAIN:CAPS"></a>G_LOG_DOMAIN</h3>
<a class="indexterm" name="id2975863"></a><pre class="programlisting">#define G_LOG_DOMAIN ((gchar*) 0)
</pre>
<p>
Defines the log domain.
For applications, this is typically left as the default <a href="glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> (or "") domain.
Libraries should define this so that any messages which they log can
be differentiated from messages from other libraries and application code.
But be careful not to define it in any public header files.
</p>
<p>
For example, GTK+ uses this in its Makefile.am:
</p>
<div class="informalexample"><pre class="programlisting">
INCLUDES = -DG_LOG_DOMAIN=\"Gtk\"
</pre></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2975905"></a><h3>
<a name="G-LOG-FATAL-MASK:CAPS"></a>G_LOG_FATAL_MASK</h3>
<a class="indexterm" name="id2975919"></a><pre class="programlisting">#define G_LOG_FATAL_MASK (G_LOG_FLAG_RECURSION | G_LOG_LEVEL_ERROR)
</pre>
<p>
GLib log levels that are considered fatal by default.
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2975936"></a><h3>
<a name="G-LOG-LEVEL-USER-SHIFT:CAPS"></a>G_LOG_LEVEL_USER_SHIFT</h3>
<a class="indexterm" name="id2975949"></a><pre class="programlisting">#define G_LOG_LEVEL_USER_SHIFT (8)
</pre>
<p>
Log level shift offset for user defined log levels (0-7 are used by GLib).
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2975966"></a><h3>
<a name="GLogFunc"></a>GLogFunc ()</h3>
<a class="indexterm" name="id2975979"></a><pre class="programlisting">void (*GLogFunc) (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *message,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre>
<p>
Specifies the prototype of log handler functions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain of the message.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_level</code></em> :</span></td>
<td>the log level of the message (including the fatal and recursion
flags).
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>message</code></em> :</span></td>
<td>the message to process.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>user_data</code></em> :</span></td>
<td>user data, set in <a href="glib-Message-Logging.html#g-log-set-handler"><code class="function">g_log_set_handler()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2976103"></a><h3>
<a name="GLogLevelFlags"></a>enum GLogLevelFlags</h3>
<a class="indexterm" name="id2976116"></a><pre class="programlisting">typedef enum
{
/* log flags */
G_LOG_FLAG_RECURSION = 1 << 0,
G_LOG_FLAG_FATAL = 1 << 1,
/* GLib log levels */
G_LOG_LEVEL_ERROR = 1 << 2, /* always fatal */
G_LOG_LEVEL_CRITICAL = 1 << 3,
G_LOG_LEVEL_WARNING = 1 << 4,
G_LOG_LEVEL_MESSAGE = 1 << 5,
G_LOG_LEVEL_INFO = 1 << 6,
G_LOG_LEVEL_DEBUG = 1 << 7,
G_LOG_LEVEL_MASK = ~(G_LOG_FLAG_RECURSION | G_LOG_FLAG_FATAL)
} GLogLevelFlags;
</pre>
<p>
Flags specifying the level of log messages.
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2976146"></a><h3>
<a name="g-log"></a>g_log ()</h3>
<a class="indexterm" name="id2976158"></a><pre class="programlisting">void g_log (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *format,
...);</pre>
<p>
Logs an error or debugging message.
If the log level has been set as fatal, the <code class="function">abort()</code>
function is called to terminate the program.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain, usually <a href="glib-Message-Logging.html#G-LOG-DOMAIN:CAPS"><span class="type">G_LOG_DOMAIN</span></a>.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_level</code></em> :</span></td>
<td>the log level, either from <a href="glib-Message-Logging.html#GLogLevelFlags"><span class="type">GLogLevelFlags</span></a> or a user-defined level.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>format</code></em> :</span></td>
<td>the message format. See the <code class="function">printf()</code>
documentation.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>the parameters to insert into the format string.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2976305"></a><h3>
<a name="g-logv"></a>g_logv ()</h3>
<a class="indexterm" name="id2976318"></a><pre class="programlisting">void g_logv (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *format,
va_list args);</pre>
<p>
Logs an error or debugging message.
If the log level has been set as fatal, the <code class="function">abort()</code>
function is called to terminate the program.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_level</code></em> :</span></td>
<td>the log level.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>format</code></em> :</span></td>
<td>the message format. See the <code class="function">printf()</code>
documentation.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>args</code></em> :</span></td>
<td>the parameters to insert into the format string.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2976453"></a><h3>
<a name="g-message"></a>g_message()</h3>
<a class="indexterm" name="id2976465"></a><pre class="programlisting">#define g_message(...)</pre>
<p>
A convenience function/macro to log a normal message.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>format string, followed by parameters to insert into the format string (as with <code class="function">printf()</code>)
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2976642"></a><h3>
<a name="g-warning"></a>g_warning()</h3>
<a class="indexterm" name="id2976655"></a><pre class="programlisting">#define g_warning(...)</pre>
<p>
A convenience function/macro to log a warning message.
</p>
<p>
You can make warnings fatal at runtime by setting the <code class="literal">G_DEBUG</code> environment
variable (see <a href="glib-running.html" target="_top">Running GLib Applications</a>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>format string, followed by parameters to insert into the format string (as with <code class="function">printf()</code>)
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2976855"></a><h3>
<a name="g-critical"></a>g_critical()</h3>
<a class="indexterm" name="id2976868"></a><pre class="programlisting">#define g_critical(...)</pre>
<p>
Logs a "critical warning" (<span class="type">G_LOG_LEVEL_CRITICAL</span>). It's more or less
application-defined what constitutes a critical vs. a regular
warning. You could call <a href="glib-Message-Logging.html#g-log-set-always-fatal"><code class="function">g_log_set_always_fatal()</code></a> to make critical
warnings exit the program, then use <a href="glib-Message-Logging.html#g-critical"><code class="function">g_critical()</code></a> for fatal errors, for
example.
</p>
<p>
You can also make critical warnings fatal at runtime by setting
the <code class="literal">G_DEBUG</code> environment variable (see
<a href="glib-running.html" target="_top">Running GLib Applications</a>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>format string, followed by parameters to insert into the format string (as with <code class="function">printf()</code>)
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2977100"></a><h3>
<a name="g-error"></a>g_error()</h3>
<a class="indexterm" name="id2977113"></a><pre class="programlisting">#define g_error(...)</pre>
<p>
A convenience function/macro to log an error message.
Error messages are always fatal, resulting in a call to
<code class="function">abort()</code> to terminate the application.
This function will result in a core dump; don't use it for errors you
expect. Using this function indicates a bug in your program, i.e. an
assertion failure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>format string, followed by parameters to insert into the format string (as with <code class="function">printf()</code>)
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2977304"></a><h3>
<a name="g-debug"></a>g_debug()</h3>
<a class="indexterm" name="id2977319"></a><pre class="programlisting">#define g_debug(...)</pre>
<p>
A convenience function/macro to log a debug message.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>format string, followed by parameters to insert into the format string (as with <code class="function">printf()</code>)
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>...</code></em> :</span></td>
<td>
</td>
</tr>
</tbody>
</table></div>
<p>Since 2.6
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2977501"></a><h3>
<a name="g-log-set-handler"></a>g_log_set_handler ()</h3>
<a class="indexterm" name="id2977514"></a><pre class="programlisting"><a href="glib-Basic-Types.html#guint">guint</a> g_log_set_handler (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_levels,
<a href="glib-Message-Logging.html#GLogFunc">GLogFunc</a> log_func,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre>
<p>
Sets the log handler for a domain and a set of log levels.
To handle fatal and recursive messages the <em class="parameter"><code>log_levels</code></em> parameter
must be combined with the <span class="type">G_LOG_FLAG_FATAL</span> and <span class="type">G_LOG_FLAG_RECURSION</span>
bit flags.
</p>
<p>
Note that since the <span class="type">G_LOG_LEVEL_ERROR</span> log level is always fatal, if
you want to set a handler for this log level you must combine it with
<span class="type">G_LOG_FLAG_FATAL</span>.
</p>
<div class="example">
<a name="id2977619"></a><p class="title"><b>Example 13. Adding a log handler for all warning messages in the default
(application) domain</b></p>
<pre class="programlisting">
g_log_set_handler (NULL, G_LOG_LEVEL_WARNING | G_LOG_FLAG_FATAL
| G_LOG_FLAG_RECURSION, my_log_handler, NULL);
</pre>
</div>
<div class="example">
<a name="id2977635"></a><p class="title"><b>Example 14. Adding a log handler for all critical messages from GTK+</b></p>
<pre class="programlisting">
g_log_set_handler ("Gtk", G_LOG_LEVEL_CRITICAL | G_LOG_FLAG_FATAL
| G_LOG_FLAG_RECURSION, my_log_handler, NULL);
</pre>
</div>
<div class="example">
<a name="id2977650"></a><p class="title"><b>Example 15. Adding a log handler for <span class="emphasis"><em>all</em></span> messages from
GLib</b></p>
<pre class="programlisting">
g_log_set_handler ("GLib", G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL
| G_LOG_FLAG_RECURSION, my_log_handler, NULL);
</pre>
</div>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain, or <a href="glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for the default "" application domain.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_levels</code></em> :</span></td>
<td>the log levels to apply the log handler for. To handle fatal
and recursive messages as well, combine the log levels with the
<span class="type">G_LOG_FLAG_FATAL</span> and <span class="type">G_LOG_FLAG_RECURSION</span> bit flags.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_func</code></em> :</span></td>
<td>the log handler function.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>user_data</code></em> :</span></td>
<td>data passed to the log handler.
</td>
</tr>
<tr>
<td>
<span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td>
<td>the id of the new handler.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2977770"></a><h3>
<a name="g-log-remove-handler"></a>g_log_remove_handler ()</h3>
<a class="indexterm" name="id2977783"></a><pre class="programlisting">void g_log_remove_handler (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Basic-Types.html#guint">guint</a> handler_id);</pre>
<p>
Removes the log handler.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>handler_id</code></em> :</span></td>
<td>the id of the handler, which was returned in <a href="glib-Message-Logging.html#g-log-set-handler"><code class="function">g_log_set_handler()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2977863"></a><h3>
<a name="g-log-set-always-fatal"></a>g_log_set_always_fatal ()</h3>
<a class="indexterm" name="id2977877"></a><pre class="programlisting"><a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> g_log_set_always_fatal (<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> fatal_mask);</pre>
<p>
Sets the message levels which are always fatal, in any log domain.
When a message with any of these levels is logged the program terminates.
You can only set the levels defined by GLib to be fatal.
<code class="literal">G_LOG_LEVEL_ERROR</code> is always fatal.
</p>
<p>
You can also make some message levels
fatal at runtime by setting the <code class="literal">G_DEBUG</code> environment variable (see
<a href="glib-running.html" target="_top">Running GLib Applications</a>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>fatal_mask</code></em> :</span></td>
<td>the mask containing bits set for each level of error which is
to be fatal.
</td>
</tr>
<tr>
<td>
<span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td>
<td>the old fatal mask.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2977971"></a><h3>
<a name="g-log-set-fatal-mask"></a>g_log_set_fatal_mask ()</h3>
<a class="indexterm" name="id2977985"></a><pre class="programlisting"><a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> g_log_set_fatal_mask (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> fatal_mask);</pre>
<p>
Sets the log levels which are fatal in the given domain.
<code class="literal">G_LOG_LEVEL_ERROR</code> is always fatal.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>fatal_mask</code></em> :</span></td>
<td>the new fatal mask.
</td>
</tr>
<tr>
<td>
<span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td>
<td>the old fatal mask for the log domain.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2978077"></a><h3>
<a name="g-log-default-handler"></a>g_log_default_handler ()</h3>
<a class="indexterm" name="id2978090"></a><pre class="programlisting">void g_log_default_handler (const <a href="glib-Basic-Types.html#gchar">gchar</a> *log_domain,
<a href="glib-Message-Logging.html#GLogLevelFlags">GLogLevelFlags</a> log_level,
const <a href="glib-Basic-Types.html#gchar">gchar</a> *message,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> unused_data);</pre>
<p>
The default log handler set up by GLib; <a href="glib-Message-Logging.html#g-log-set-default-handler"><code class="function">g_log_set_default_handler()</code></a>
allows to install an alternate default log handler.
This is used if no log handler has been set for the particular log domain
and log level combination. It outputs the message to stderr or stdout
and if the log level is fatal it calls <code class="function">abort()</code>.
</p>
<p>
stderr is used for levels <code class="literal">G_LOG_LEVEL_ERROR</code>, <code class="literal">G_LOG_LEVEL_CRITICAL</code>,
<code class="literal">G_LOG_LEVEL_WARNING</code> and <code class="literal">G_LOG_LEVEL_MESSAGE</code>. stdout is used for the rest.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_domain</code></em> :</span></td>
<td>the log domain of the message.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_level</code></em> :</span></td>
<td>the level of the message.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>message</code></em> :</span></td>
<td>the message.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>unused_data</code></em> :</span></td>
<td>data passed from <a href="glib-Message-Logging.html#g-log"><code class="function">g_log()</code></a> which is unused.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2978289"></a><h3>
<a name="g-log-set-default-handler"></a>g_log_set_default_handler ()</h3>
<a class="indexterm" name="id2978306"></a><pre class="programlisting"><a href="glib-Message-Logging.html#GLogFunc">GLogFunc</a> g_log_set_default_handler (<a href="glib-Message-Logging.html#GLogFunc">GLogFunc</a> log_func,
<a href="glib-Basic-Types.html#gpointer">gpointer</a> user_data);</pre>
<p>
Installs a default log handler which is used is used if no
log handler has been set for the particular log domain
and log level combination. By default, GLib uses
<a href="glib-Message-Logging.html#g-log-default-handler"><code class="function">g_log_default_handler()</code></a> as default log handler.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term"><em class="parameter"><code>log_func</code></em> :</span></td>
<td>the log handler function.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>user_data</code></em> :</span></td>
<td>data passed to the log handler.
</td>
</tr>
<tr>
<td>
<span class="term"><span class="emphasis"><em>Returns</em></span> :</span></td>
<td>the previous default log handler
</td>
</tr>
</tbody>
</table></div>
<p>Since 2.6
</p>
</div>
</div>
</div>
</body>
</html>