glib-Message-Logging.html [plain text]
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Message Logging</title><meta name="generator" content="DocBook XSL Stylesheets V1.65.1"><link rel="home" href="index.html" title="GLib Reference Manual"><link rel="up" href="glib-core.html" title="GLib Core Application Support"><link rel="previous" href="glib-Warnings-and-Assertions.html" title="Message Output and Debugging Functions"><link rel="next" href="glib-utilities.html" title="GLib Utilities"><link rel="chapter" href="glib.html" title="GLib Overview"><link rel="refentry" href="glib-building.html" title="Compiling the GLib package"><link rel="refentry" href="glib-cross-compiling.html" title="Cross-compiling the GLib package"><link rel="refentry" href="glib-compiling.html" title="Compiling GLib Applications"><link rel="refentry" href="glib-running.html" title="Running GLib Applications"><link rel="refentry" href="glib-changes.html" title="Changes to GLib"><link rel="refentry" href="glib-resources.html" title="Mailing lists and bug reports"><link rel="chapter" href="glib-fundamentals.html" title="GLib Fundamentals"><link rel="refentry" href="glib-Basic-Types.html" title="Basic Types"><link rel="refentry" href="glib-Limits-of-Basic-Types.html" title="Limits of Basic Types"><link rel="refentry" href="glib-Standard-Macros.html" title="Standard Macros"><link rel="refentry" href="glib-Type-Conversion-Macros.html" title="Type Conversion Macros"><link rel="refentry" href="glib-Byte-Order-Macros.html" title="Byte Order Macros"><link rel="refentry" href="glib-Numerical-Definitions.html" title="Numerical Definitions"><link rel="refentry" href="glib-Miscellaneous-Macros.html" title="Miscellaneous Macros"><link rel="refentry" href="glib-Atomic-Operations.html" title="Atomic Operations"><link rel="chapter" href="glib-core.html" title="GLib Core Application Support"><link rel="refentry" href="glib-The-Main-Event-Loop.html" title="The Main Event Loop"><link rel="refentry" href="glib-Threads.html" title="
Threads"><link rel="refentry" href="glib-Thread-Pools.html" title="Thread Pools"><link rel="refentry" href="glib-Asynchronous-Queues.html" title="Asynchronous Queues"><link rel="refentry" href="glib-Dynamic-Loading-of-Modules.html" title="Dynamic Loading of Modules"><link rel="refentry" href="glib-Memory-Allocation.html" title="Memory Allocation"><link rel="refentry" href="glib-IO-Channels.html" title="IO Channels"><link rel="refentry" href="glib-Error-Reporting.html" title="Error Reporting"><link rel="refentry" href="glib-Warnings-and-Assertions.html" title="Message Output and Debugging Functions"><link rel="refentry" href="glib-Message-Logging.html" title="Message Logging"><link rel="chapter" href="glib-utilities.html" title="GLib Utilities"><link rel="refentry" href="glib-String-Utility-Functions.html" title="String Utility Functions"><link rel="refentry" href="glib-Character-Set-Conversion.html" title="Character Set Conversion"><link rel="refentry" href="glib-Unicode-Manipulation.html" title="Unicode Manipulation"><link rel="refentry" href="glib-I18N.html" title="Internationalization"><link rel="refentry" href="glib-Date-and-Time-Functions.html" title="Date and Time Functions"><link rel="refentry" href="glib-Random-Numbers.html" title="Random Numbers"><link rel="refentry" href="glib-Hook-Functions.html" title="Hook Functions"><link rel="refentry" href="glib-Miscellaneous-Utility-Functions.html" title="Miscellaneous Utility Functions"><link rel="refentry" href="glib-Lexical-Scanner.html" title="Lexical Scanner"><link rel="refentry" href="glib-Automatic-String-Completion.html" title="Automatic String Completion"><link rel="refentry" href="glib-Timers.html" title="Timers"><link rel="refentry" href="glib-Spawning-Processes.html" title="Spawning Processes"><link rel="refentry" href="glib-File-Utilities.html" title="File Utilities"><link rel="refentry" href="glib-Shell-related-Utilities.html" title="Shell-related Utilities"><link rel="refentry" href="glib-Glob-style-pattern-matching.html" title="Glob-style pattern matching"><link rel="refentry" href="glib-Simple-XML-Subset-Parser.html" title="Simple XML Subset Parser"><link rel="refentry" href="glib-Windows-Compatability-Functions.html" title="Windows Compatibility Functions"><link rel="chapter" href="glib-data-types.html" title="GLib Data Types"><link rel="refentry" href="glib-Memory-Chunks.html" title="Memory Chunks"><link rel="refentry" href="glib-Doubly-Linked-Lists.html" title="Doubly-Linked Lists"><link rel="refentry" href="glib-Singly-Linked-Lists.html" title="Singly-Linked Lists"><link rel="refentry" href="glib-Double-ended-Queues.html" title="Double-ended Queues"><link rel="refentry" href="glib-Trash-Stacks.html" title="Trash Stacks"><link rel="refentry" href="glib-Hash-Tables.html" title="Hash Tables"><link rel="refentry" href="glib-Strings.html" title="Strings"><link rel="refentry" href="glib-String-Chunks.html" title="String Chunks"><link rel="refentry" href="glib-Arrays.html" title="Arrays"><link rel="refentry" href="glib-Pointer-Arrays.html" title="Pointer Arrays"><link rel="refentry" href="glib-Byte-Arrays.html" title="Byte Arrays"><link rel="refentry" href="glib-Balanced-Binary-Trees.html" title="Balanced Binary Trees"><link rel="refentry" href="glib-N-ary-Trees.html" title="N-ary Trees"><link rel="refentry" href="glib-Quarks.html" title="Quarks"><link rel="refentry" href="glib-Keyed-Data-Lists.html" title="Keyed Data Lists"><link rel="refentry" href="glib-Datasets.html" title="Datasets"><link rel="refentry" href="glib-Relations-and-Tuples.html" title="Relations and Tuples"><link rel="refentry" href="glib-Caches.html" title="Caches"><link rel="refentry" href="glib-Memory-Allocators.html" title="Memory Allocators"><link rel="chapter" href="tools.html" title="GLib Tools"><link rel="refentry" href="glib-gettextize.html" title="glib-gettextize"><link rel="index" href="ix01.html" title="Index"><link rel="section" href="glib-Message-Logging.html#id3092228" title="Description"><link rel="section" href="glib-Message-Logging.html#id3092252" title="Details"><meta name="generator" content="GTK-Doc V1.2 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="glib-Warnings-and-Assertions.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="glib-core.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GLib Reference Manual</th><td><a accesskey="n" href="glib-utilities.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><div class="refentry" lang="en"><a name="glib-Message-Logging"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Message Logging</span></h2><p>Message Logging — versatile support for logging messages with different levels of importance.</p></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> (...)
<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);
</pre></div><div class="refsect1" lang="en"><a name="id3092228"></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="id3092252"></a><h2>Details</h2><div class="refsect2" lang="en"><a name="id3092258"></a><h3><a name="G-LOG-DOMAIN-CAPS"></a>G_LOG_DOMAIN</h3><a class="indexterm" name="id3092269"></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 <tt class="literal">NULL</tt> (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="id3092307"></a><h3><a name="G-LOG-FATAL-MASK-CAPS"></a>G_LOG_FATAL_MASK</h3><a class="indexterm" name="id3092318"></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="id3092335"></a><h3><a name="G-LOG-LEVEL-USER-SHIFT-CAPS"></a>G_LOG_LEVEL_USER_SHIFT</h3><a class="indexterm" name="id3092346"></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="id3092363"></a><h3><a name="GLogFunc"></a>GLogFunc ()</h3><a class="indexterm" name="id3092373"></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"><i class="parameter"><tt>log_domain</tt></i> :</span></td><td>the log domain of the message.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>log_level</tt></i> :</span></td><td>the log level of the message (including the fatal and recursion
flags).
</td></tr><tr><td><span class="term"><i class="parameter"><tt>message</tt></i> :</span></td><td>the message to process.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>user_data</tt></i> :</span></td><td>user data, set in <a href="glib-Message-Logging.html#g-log-set-handler"><tt class="function">g_log_set_handler()</tt></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3092498"></a><h3><a name="GLogLevelFlags"></a>enum GLogLevelFlags</h3><a class="indexterm" name="id3092509"></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="id3092539"></a><h3><a name="g-log"></a>g_log ()</h3><a class="indexterm" name="id3092549"></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 <tt class="function"><tt class="function">abort()</tt></tt>
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"><i class="parameter"><tt>log_domain</tt></i> :</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"><i class="parameter"><tt>log_level</tt></i> :</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"><i class="parameter"><tt>format</tt></i> :</span></td><td>the message format. See the <tt class="function"><tt class="function">printf()</tt></tt>
documentation.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>...</tt></i> :</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="id3092705"></a><h3><a name="g-logv"></a>g_logv ()</h3><a class="indexterm" name="id3092715"></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 <tt class="function"><tt class="function">abort()</tt></tt>
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"><i class="parameter"><tt>log_domain</tt></i> :</span></td><td>the log domain.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>log_level</tt></i> :</span></td><td>the log level.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>format</tt></i> :</span></td><td>the message format. See the <tt class="function"><tt class="function">printf()</tt></tt>
documentation.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>args</tt></i> :</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="id3092857"></a><h3><a name="g-message"></a>g_message()</h3><a class="indexterm" name="id3092868"></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"><i class="parameter"><tt>...</tt></i> :</span></td><td>format string, followed by parameters to insert into the format string (as with <tt class="function"><tt class="function">printf()</tt></tt>)
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3092916"></a><h3><a name="g-warning"></a>g_warning()</h3><a class="indexterm" name="id3092927"></a><pre class="programlisting">#define g_warning(...)</pre><p>
A convenience function/macro to log a warning message.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>...</tt></i> :</span></td><td>format string, followed by parameters to insert into the format string (as with <tt class="function"><tt class="function">printf()</tt></tt>)
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3092976"></a><h3><a name="g-critical"></a>g_critical()</h3><a class="indexterm" name="id3092987"></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"><tt class="function">g_log_set_always_fatal()</tt></a> to make critical
warnings exit the program, then use <a href="glib-Message-Logging.html#g-critical"><tt class="function">g_critical()</tt></a> for fatal errors, for
example.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>...</tt></i> :</span></td><td>format string, followed by parameters to insert into the format string (as with <tt class="function"><tt class="function">printf()</tt></tt>)
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3093070"></a><h3><a name="g-error"></a>g_error()</h3><a class="indexterm" name="id3093080"></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
<tt class="function"><tt class="function">abort()</tt></tt> 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"><i class="parameter"><tt>...</tt></i> :</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="id3093132"></a><h3><a name="g-log-set-handler"></a>g_log_set_handler ()</h3><a class="indexterm" name="id3093144"></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 <i class="parameter"><tt>log_levels</tt></i> 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="id3093248"></a><p class="title"><b>Example 12. 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="id3093264"></a><p class="title"><b>Example 13. 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="id3093280"></a><p class="title"><b>Example 14. 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"><i class="parameter"><tt>log_domain</tt></i> :</span></td><td>the log domain, or <tt class="literal">NULL</tt> for the default "" application domain.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>log_levels</tt></i> :</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"><i class="parameter"><tt>log_func</tt></i> :</span></td><td>the log handler function.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>user_data</tt></i> :</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="id3093394"></a><h3><a name="g-log-remove-handler"></a>g_log_remove_handler ()</h3><a class="indexterm" name="id3093405"></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"><i class="parameter"><tt>log_domain</tt></i> :</span></td><td>the log domain.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>handler_id</tt></i> :</span></td><td>the id of the handler, which was returned in <a href="glib-Message-Logging.html#g-log-set-handler"><tt class="function">g_log_set_handler()</tt></a>.
</td></tr></tbody></table></div></div><hr><div class="refsect2" lang="en"><a name="id3093485"></a><h3><a name="g-log-set-always-fatal"></a>g_log_set_always_fatal ()</h3><a class="indexterm" name="id3093497"></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.
<tt class="literal">G_LOG_LEVEL_ERROR</tt> is always fatal.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>fatal_mask</tt></i> :</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="id3093565"></a><h3><a name="g-log-set-fatal-mask"></a>g_log_set_fatal_mask ()</h3><a class="indexterm" name="id3093577"></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.
<tt class="literal">G_LOG_LEVEL_ERROR</tt> is always fatal.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>log_domain</tt></i> :</span></td><td>the log domain.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>fatal_mask</tt></i> :</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="id3093664"></a><h3><a name="g-log-default-handler"></a>g_log_default_handler ()</h3><a class="indexterm" name="id3093675"></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.
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 <tt class="function"><tt class="function">abort()</tt></tt>.
</p><p>
stderr is used for levels <tt class="literal">G_LOG_LEVEL_ERROR</tt>, <tt class="literal">G_LOG_LEVEL_CRITICAL</tt>, and
<tt class="literal">G_LOG_LEVEL_WARNING</tt>. stdout is used for the rest.
</p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><i class="parameter"><tt>log_domain</tt></i> :</span></td><td>the log domain of the message.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>log_level</tt></i> :</span></td><td>the level of the message.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>message</tt></i> :</span></td><td>the message.
</td></tr><tr><td><span class="term"><i class="parameter"><tt>unused_data</tt></i> :</span></td><td>data passed from <a href="glib-Message-Logging.html#g-log"><tt class="function">g_log()</tt></a> which is unused.
</td></tr></tbody></table></div></div></div></div><table class="navigation" width="100%" summary="Navigation footer" cellpadding="2" cellspacing="0"><tr valign="middle"><td align="left"><a accesskey="p" href="glib-Warnings-and-Assertions.html"><b><< Message Output and Debugging Functions</b></a></td><td align="right"><a accesskey="n" href="glib-utilities.html"><b>GLib Utilities >></b></a></td></tr></table></body></html>