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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<div class="refentry" title="Running GTK+ Applications">
<a name="gtk-running"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle">Running GTK+ Applications</span></h2>
<p>Running GTK+ Applications —
How to run and debug your GTK+ application
</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1" title="Running and debugging GTK+ Applications">
<a name="id385203"></a><h2>Running and debugging GTK+ Applications</h2>
<div class="refsect2" title="Common commandline options">
<a name="id397254"></a><h3>Common commandline options</h3>
<p>
All GTK+ applications support a number of standard commandline
options. These are removed from <code class="literal">argv</code> by gtk_init().
Modules may parse and remove further options. The
<a class="link" href="gtk-x11.html#x11-cmdline" title="X11-specific commandline options">X11</a> and
<a class="link" href="gtk-windows.html#win32-cmdline" title="Windows-specific commandline options">Windows</a> GDK backends parse
some additional commandline options.
</p>
<p title="--gtk-module module"><b><code class="systemitem">--gtk-module <em class="replaceable"><code>module</code></em></code>. </b>
A list of modules to load in addition to those specified in the
<code class="envar">GTK_MODULES</code> environment variable and the
<code class="literal">gtk-modules</code> setting.
</p>
<p title="--g-fatal-warnings"><b><code class="systemitem">--g-fatal-warnings</code>. </b>
Make GTK+ abort on all warnings. This is useful to stop on the first
warning in a debugger, if your application is printing multiple
warnings. It's almost always best to start debugging with the first
warning that occurs.
</p>
<p title="--gtk-debug options"><b><code class="systemitem">--gtk-debug <em class="replaceable"><code>options</code></em></code>. </b>
A list of <a class="link" href="gtk-running.html#GTK-Debug-Options" title="GTK_DEBUG">debug options</a>
to turn on in addition to those specified in the <code class="envar">GTK_DEBUG</code>
environment variable.
This option is only available if GTK+ has been configured with
<code class="option">--enable-debug=yes</code>.
</p>
<p title="--gtk-no-debug options"><b><code class="systemitem">--gtk-no-debug <em class="replaceable"><code>options</code></em></code>. </b>
A list of <a class="link" href="gtk-running.html#GTK-Debug-Options" title="GTK_DEBUG">debug options</a>
to turn off.
This option is only available if GTK+ has been configured with
<code class="option">--enable-debug=yes</code>.
</p>
<p>
The following options are really used by GDK, not by GTK+, but we
list them here for completeness nevertheless.
</p>
<p title="--class class"><b><code class="systemitem">--class <em class="replaceable"><code>class</code></em></code>. </b>
Sets the program class; see gdk_set_program_class().
</p>
<p title="--name name"><b><code class="systemitem">--name <em class="replaceable"><code>name</code></em></code>. </b>
Sets the program name.
</p>
<p title="--gdk-debug options"><b><code class="systemitem">--gdk-debug <em class="replaceable"><code>options</code></em></code>. </b>
A list of <a class="link" href="gtk-running.html#GDK-Debug-Options" title="GDK_DEBUG">debug options</a>
to turn on in addition to those specified in the <code class="envar">GDK_DEBUG</code>
environment variable. This option is only available if GTK+ has been
configured with <code class="option">--enable-debug=yes</code>.
</p>
<p title="--gdk-no-debug options"><b><code class="systemitem">--gdk-no-debug <em class="replaceable"><code>options</code></em></code>. </b>
A list of <a class="link" href="gtk-running.html#GDK-Debug-Options" title="GDK_DEBUG">debug options</a>
to turn off. This option is only available if GTK+ has been configured with
<code class="option">--enable-debug=yes</code>.
</p>
</div>
<hr>
<div class="refsect2" title="Environment variables">
<a name="id392479"></a><h3>Environment variables</h3>
<p>
GTK+ inspects a number of environment variables in addition to standard
variables like <code class="envar">LANG</code>, <code class="envar">PATH</code>, <code class="envar">HOME</code>
or <code class="envar">DISPLAY</code>; mostly to determine paths to look for certain
files. The <a class="link" href="gtk-x11.html#x11-envar" title="X11-specific environment variables">X11</a>,
<a class="link" href="gtk-windows.html#win32-envar" title="Windows-specific environment variables">Windows</a> and
Framebuffer GDK backends use some
additional environment variables.
</p>
<p title="GTK_DEBUG"><a name="GTK-Debug-Options"></a><b><code class="envar">GTK_DEBUG</code>. </b>
If GTK+ has been configured with <code class="option">--enable-debug=yes</code>,
this variable can be set to a list of debug options, which cause GTK+
to print out different types of debugging information.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">misc</span></p></td>
<td><p>Miscellaneous information</p></td>
</tr>
<tr>
<td><p><span class="term">plugsocket</span></p></td>
<td><p>Cross-process embedding</p></td>
</tr>
<tr>
<td><p><span class="term">text</span></p></td>
<td><p>Text widget internals</p></td>
</tr>
<tr>
<td><p><span class="term">tree</span></p></td>
<td><p>Tree widget internals</p></td>
</tr>
<tr>
<td><p><span class="term">updates</span></p></td>
<td><p>Visual feedback about window updates</p></td>
</tr>
<tr>
<td><p><span class="term">keybindings</span></p></td>
<td><p>Keybindings</p></td>
</tr>
<tr>
<td><p><span class="term">multihead</span></p></td>
<td><p>Working on multiple displays</p></td>
</tr>
<tr>
<td><p><span class="term">modules</span></p></td>
<td><p>Loading of modules</p></td>
</tr>
<tr>
<td><p><span class="term">geometry</span></p></td>
<td><p>Size allocation</p></td>
</tr>
<tr>
<td><p><span class="term">icontheme</span></p></td>
<td><p>Icon themes</p></td>
</tr>
<tr>
<td><p><span class="term">printing</span></p></td>
<td><p>Printing support</p></td>
</tr>
<tr>
<td><p><span class="term">builder</span></p></td>
<td><p>GtkBuilder support</p></td>
</tr>
</tbody>
</table></div>
<p title="GTK_DEBUG">
The special value <code class="literal">all</code> can be used to turn on all
debug options.
</p>
<p title="GTK_MODULES"><b><code class="envar">GTK_MODULES</code>. </b>
A list of modules to load. Note that GTK+ also allows to specify modules to load via a commandline option (<code class="option">--gtk-module</code>) and with the <code class="literal">gtk-modules</code> setting.
</p>
<p title="GTK_PATH"><b><code class="envar">GTK_PATH</code>. </b>
Specifies a list of directories to search when GTK+ is looking for
dynamically loaded objects such as the modules specified by
<code class="envar">GTK_MODULES</code>, theme engines, input method
modules, file system backends and print backends. If the path to
the dynamically loaded object is given as an absolute path name,
then GTK+ loads it directly.
Otherwise, GTK+ goes in turn through the directories in GTK_PATH,
followed by the directory <code class="filename">.gtk-2.0</code> in the user's
home directory, followed by the system default directory,
which is <code class="filename"><em class="replaceable"><code>libdir</code></em>/gtk-2.0/modules</code>.
(If <code class="envar">GTK_EXE_PREFIX</code> is defined, <em class="replaceable"><code>libdir</code></em> is
<code class="filename">$GTK_EXE_PREFIX/lib</code>. Otherwise it is the libdir
specified when GTK+ was configured, usually
<code class="filename">/usr/lib</code>, or
<code class="filename">/usr/local/lib</code>.)
For each directory in this list, GTK+ actually looks in a
subdirectory
<code class="filename"><em class="replaceable"><code>directory</code></em>/<em class="replaceable"><code>version</code></em>/<em class="replaceable"><code>host</code></em>/<em class="replaceable"><code>type</code></em></code>
Where <em class="replaceable"><code>version</code></em> is derived from the
version of GTK+ (use <code class="literal">pkg-config
--variable=gtk_binary_version gtk+-2.0</code> to determine this from a
script), <em class="replaceable"><code>host</code></em> is the architecture on
which GTK+ was built. (use <code class="literal">pkg-config
--variable=gtk_host gtk+-2.0</code> to determine this from a
script), and <em class="replaceable"><code>type</code></em> is a directory
specific to the type of modules; currently it can be
<code class="literal">modules</code>, <code class="literal">engines</code>,
<code class="literal">immodules</code>, <code class="literal">filesystems</code> or
<code class="literal">printbackends</code>, corresponding to the types of
modules mentioned above. Either <em class="replaceable"><code>version</code></em>,
<em class="replaceable"><code>host</code></em>, or both may be omitted. GTK+ looks
first in the most specific directory, then in directories with
fewer components.
The components of GTK_PATH are separated by the ':' character on
Linux and Unix, and the ';' character on Windows.
</p>
<p title="GTK_IM_MODULE"><b><code class="envar">GTK_IM_MODULE</code>. </b>
Specifies an IM module to use in preference to the one determined
from the locale. If this isn't set and you are running on the system
that enables <code class="literal">XSETTINGS</code> and has a value in
<code class="literal">Gtk/IMModule</code>, that will be used for the default
IM module.
</p>
<p title="GTK_IM_MODULE_FILE"><a name="im-module-file"></a><b><code class="envar">GTK_IM_MODULE_FILE</code>. </b>
Specifies the file listing the IM modules to load. This environment
variable overrides the <code class="literal">im_module_file</code> specified in
the RC files, which in turn overrides the default value
<code class="filename"><em class="replaceable"><code>sysconfdir</code></em>/gtk-2.0/gtk.immodules</code>
(<em class="replaceable"><code>sysconfdir</code></em> is the sysconfdir specified when GTK+ was configured,
usually <code class="filename">/usr/local/etc</code>.)
</p>
<p title="GTK2_RC_FILES"><b><code class="envar">GTK2_RC_FILES</code>. </b>
Specifies a list of RC files to parse instead of the default ones;
see <a class="link" href="gtk-Resource-Files.html" title="Resource Files">Resource Files</a>.
</p>
<p title="GTK_EXE_PREFIX"><b><code class="envar">GTK_EXE_PREFIX</code>. </b>
If set, GTK+ uses <code class="filename">$GTK_EXE_PREFIX/lib</code> instead of
the libdir configured when GTK+ was compiled.
</p>
<p title="GTK_DATA_PREFIX"><b><code class="envar">GTK_DATA_PREFIX</code>. </b>
If set, makes GTK+ use <code class="filename">$GTK_DATA_PREFIX</code>
instead of the prefix configured when GTK+ was compiled.
</p>
<p>
The following environment variables are used by GdkPixbuf, GDK or
Pango, not by GTK+ itself, but we list them here for completeness
nevertheless.
</p>
<p title="GDK_PIXBUF_MODULE_FILE"><b><code class="envar">GDK_PIXBUF_MODULE_FILE</code>. </b>
Specifies the file listing the GdkPixbuf loader modules to load.
This environment variable overrides the default value
<code class="filename"><em class="replaceable"><code>sysconfdir</code></em>/gtk-2.0/gdk-pixbuf.loaders</code>
(<em class="replaceable"><code>sysconfdir</code></em> is the sysconfdir specified when
GTK+ was configured, usually <code class="filename">/usr/local/etc</code>.)
</p>
<p title="GDK_DEBUG"><a name="GDK-Debug-Options"></a><b><code class="envar">GDK_DEBUG</code>. </b>
If GTK+ has been configured with <code class="option">--enable-debug=yes</code>,
this variable can be set to a list of debug options, which cause GDK
to print out different types of debugging information.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">misc</span></p></td>
<td><p>Miscellaneous information</p></td>
</tr>
<tr>
<td><p><span class="term">events</span></p></td>
<td><p>Show all events received by GDK</p></td>
</tr>
<tr>
<td><p><span class="term">dnd</span></p></td>
<td><p>Information about drag-and-drop</p></td>
</tr>
<tr>
<td><p><span class="term">xim</span></p></td>
<td><p>Information about XIM support</p></td>
</tr>
<tr>
<td><p><span class="term">nograbs</span></p></td>
<td><p>Turn off all pointer and keyboard grabs</p></td>
</tr>
<tr>
<td><p><span class="term">multihead</span></p></td>
<td><p>Information related to multiple screens</p></td>
</tr>
<tr>
<td><p><span class="term">xinerama</span></p></td>
<td><p>Simulate a multi-monitor setup</p></td>
</tr>
<tr>
<td><p><span class="term">cursor</span></p></td>
<td><p>Information about cursor objects (only win32)</p></td>
</tr>
<tr>
<td><p><span class="term">draw</span></p></td>
<td><p>Information about drawing operations (only win32)</p></td>
</tr>
<tr>
<td><p><span class="term">eventloop</span></p></td>
<td><p>Information about event loop operation (mostly Quartz)</p></td>
</tr>
</tbody>
</table></div>
<p title="GDK_DEBUG">
The special value <code class="literal">all</code> can be used to turn on all
debug options.
</p>
<p title="GDK_NATIVE_WINDOWS"><b><code class="envar">GDK_NATIVE_WINDOWS</code>. </b>
If set, GDK creates all windows as native windows. This can help
applications that make assumptions about 1-1 correspondence between
GDK windows and X11 windows.
</p>
<p title="XDG_DATA_HOME, XDG_DATA_DIRS"><b><code class="envar">XDG_DATA_HOME</code>, <code class="envar">XDG_DATA_DIRS</code>. </b>
GTK+ uses these environment variables to locate icon themes
and MIME information. For more information, see
<a class="ulink" href="http://freedesktop.org/Standards/icon-theme-spec" target="_top">Icon Theme Specification</a>,
the <a class="ulink" href="http://freedesktop.org/Standards/shared-mime-info-spec" target="_top">Shared MIME-info Database</a>
and the <a class="ulink" href="http://freedesktop.org/Standards/basedir-spec" target="_top">Base Directory Specification</a>.
</p>
</div>
</div>
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