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<refentry id="gtk-running">
<refmeta>
<refentrytitle>Running GTK+ Applications</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>GTK Library</refmiscinfo>
</refmeta>

<refnamediv>
<refname>Running GTK+ Applications</refname>
<refpurpose>
How to run and debug your GTK+ application
</refpurpose>
</refnamediv>

<refsect1>
<title>Running and debugging GTK+ Applications</title>

<refsect2>
<title>Common commandline options</title>

<para>
All GTK+ applications support a number of standard commandline
options. These are removed from <literal>argv</literal> by gtk_init().
Modules may parse and remove further options. The
<link linkend="x11-cmdline">X11</link> and
<link linkend="win32-cmdline">Windows</link> GDK backends parse
some additional commandline options.
</para>

<formalpara>
<title><systemitem>--gtk-module <replaceable>module</replaceable></systemitem></title>

<para>
A list of modules to load in addition to those specified in the
<envar>GTK_MODULES</envar> environment variable and the
<literal>gtk-modules</literal> setting.
</para>
</formalpara>

<formalpara>
<title><systemitem>--g-fatal-warnings</systemitem></title>

<para>
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.
</para>
</formalpara>

<formalpara>
<title><systemitem>--gtk-debug <replaceable>options</replaceable></systemitem></title>

<para>
A list of <link linkend="GTK-Debug-Options">debug options</link>
to turn on in addition to those specified in the <envar>GTK_DEBUG</envar>
environment variable. This option is only available if GTK+ has been
configured with <option>--enable-debug=yes</option>.
</para>
</formalpara>

<formalpara>
<title><systemitem>--gtk-no-debug <replaceable>options</replaceable></systemitem></title>

<para>
A list of <link linkend="GTK-Debug-Options">debug options</link>
to turn off. This option is only available if GTK+ has been configured with
<option>--enable-debug=yes</option>.
</para>
</formalpara>

<para>
The following options are really used by GDK, not by GTK+, but we
list them here for completeness nevertheless.
</para>

<formalpara>
<title><systemitem>--class <replaceable>class</replaceable></systemitem></title>

<para>
Sets the program class; see gdk_set_program_class().
</para>
</formalpara>

<formalpara>
<title><systemitem>--name <replaceable>name</replaceable></systemitem></title>

<para>
Sets the program name.
</para>
</formalpara>

<formalpara>
<title><systemitem>--gdk-debug <replaceable>options</replaceable></systemitem></title>

<para>
A list of <link linkend="GDK-Debug-Options">debug options</link>
to turn on in addition to those specified in the <envar>GDK_DEBUG</envar>
environment variable. This option is only available if GTK+ has been
configured with <option>--enable-debug=yes</option>.
</para>
</formalpara>

<formalpara>
<title><systemitem>--gdk-no-debug <replaceable>options</replaceable></systemitem></title>

<para>
A list of <link linkend="GDK-Debug-Options">debug options</link>
to turn off. This option is only available if GTK+ has been configured with
<option>--enable-debug=yes</option>.
</para>
</formalpara>

</refsect2>

<refsect2>
<title>Environment variables</title>

<para>
GTK+ inspects a number of environment variables in addition to standard
variables like <envar>LANG</envar>, <envar>PATH</envar>, <envar>HOME</envar>
or <envar>DISPLAY</envar>; mostly to determine paths to look for certain
files. The <link linkend="x11-envar">X11</link>,
<link linkend="win32-envar">Windows</link> and
<link linkend="fb-envar">Framebuffer</link> GDK backends use some
additional environment variables.
</para>

<formalpara id="GTK-Debug-Options">
  <title><envar>GTK_DEBUG</envar></title>

  <para>
  If GTK+ has been configured with <option>--enable-debug=yes</option>,
  this variable can be set to a list of debug options, which cause GTK+
  to print out different types of debugging information.
  <variablelist>
    <varlistentry>
      <term>misc</term>
      <listitem><para>Miscellaneous information</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>plugsocket</term>
      <listitem><para>Cross-process embedding</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>text</term>
      <listitem><para>Text widget internals</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>tree</term>
      <listitem><para>Tree widget internals</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>updates</term>
      <listitem><para>Visual feedback about window updates</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>keybindings</term>
      <listitem><para>Keybindings</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>multihead</term>
      <listitem><para>Working on multiple displays</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>modules</term>
      <listitem><para>Loading of modules</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>geometry</term>
      <listitem><para>Size allocation</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>icontheme</term>
      <listitem><para>Icon themes</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>printing</term>
      <listitem><para>Printing support</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>builder</term>
      <listitem><para>GtkBuilder support</para></listitem>
    </varlistentry>

  </variablelist>
  The special value <literal>all</literal> can be used to turn on all
  debug options.
  </para>
</formalpara>

<formalpara>
  <title><envar>GTK_MODULES</envar></title>

  <para>
    A list of modules to load. Note that GTK+ also allows to specify modules to load via a commandline option (<option>--gtk-module</option>) and with the <literal>gtk-modules</literal> setting.
  </para>
</formalpara>

<formalpara>
  <title><envar>GTK_PATH</envar></title>

  <para>
    Specifies a list of directories to search when GTK+ is looking for
    dynamically loaded objects such as the modules specified by
    <envar>GTK_MODULES</envar>, 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 <filename>.gtk-3.0</filename> in the user's
    home directory, followed by the system default directory,
    which is <filename><replaceable>libdir</replaceable>/gtk-3.0/modules</filename>.
    (If <envar>GTK_EXE_PREFIX</envar> is defined, <replaceable>libdir</replaceable> is
    <filename>$GTK_EXE_PREFIX/lib</filename>. Otherwise it is the libdir
    specified when GTK+ was configured, usually
    <filename>/usr/lib</filename>, or
    <filename>/usr/local/lib</filename>.)
    For each directory in this list, GTK+ actually looks in a
    subdirectory
    <filename><replaceable>directory</replaceable>/<replaceable>version</replaceable>/<replaceable>host</replaceable>/<replaceable>type</replaceable></filename>
    Where <replaceable>version</replaceable> is derived from the
    version of GTK+ (use <literal>pkg-config
    --variable=gtk_binary_version gtk+-3.0</literal> to determine this from a
    script), <replaceable>host</replaceable> is the architecture on
    which GTK+ was built. (use <literal>pkg-config
    --variable=gtk_host gtk+-3.0</literal> to determine this from a
    script), and <replaceable>type</replaceable> is a directory
    specific to the type of modules; currently it can be
    <literal>modules</literal>, <literal>engines</literal>,
    <literal>immodules</literal>, <literal>filesystems</literal> or
    <literal>printbackends</literal>, corresponding to the types of
    modules mentioned above. Either <replaceable>version</replaceable>,
    <replaceable>host</replaceable>, 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.
  </para>
</formalpara>

<formalpara>
  <title><envar>GTK_IM_MODULE</envar></title>

  <para>
    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 <literal>XSETTINGS</literal> and has a value in
    <literal>Gtk/IMModule</literal>, that will be used for the default
    IM module.
  </para>
</formalpara>

<formalpara id="im-module-file">
  <title><envar>GTK_IM_MODULE_FILE</envar></title>

  <para>
    Specifies the file listing the IM modules to load. This environment
    variable overrides the <literal>im_module_file</literal> specified in
    the RC files, which in turn overrides the default value
    <filename><replaceable>libdir</replaceable>/gtk-3.0/3.0.0/immodules.cache</filename>
    (<replaceable>libdir</replaceable> has the same meaning here as explained for <envar>GTK_PATH</envar>).
  </para>
</formalpara>

<formalpara>
  <title><envar>GTK2_RC_FILES</envar></title>

  <para>
    Specifies a list of RC files to parse instead of the default ones;
    see <link linkend="gtk-Resource-Files">Resource Files</link>.
  </para>
</formalpara>

<formalpara>
  <title><envar>GTK_EXE_PREFIX</envar></title>

  <para>
    If set, GTK+ uses <filename>$GTK_EXE_PREFIX/lib</filename> instead of
    the libdir configured when GTK+ was compiled.
  </para>
</formalpara>

<formalpara>
  <title><envar>GTK_DATA_PREFIX</envar></title>

  <para>
    If set, makes GTK+ use <filename>$GTK_DATA_PREFIX</filename>
    instead of the prefix configured when GTK+ was compiled.
  </para>
</formalpara>

<para>
The following environment variables are used by GdkPixbuf, GDK or
Pango, not by GTK+ itself, but we list them here for completeness
nevertheless.
</para>

<formalpara>
  <title><envar>GDK_PIXBUF_MODULE_FILE</envar></title>

  <para>
    Specifies the file listing the GdkPixbuf loader modules to load.
    This environment variable overrides the default value
	<filename><replaceable>libdir</replaceable>/gtk-3.0/3.0.0/loaders.cache</filename>
    (<replaceable>libdir</replaceable> is the sysconfdir specified when
	GTK+ was configured, usually <filename>/usr/local/lib</filename>.)
  </para>
 </formalpara>

<formalpara id="GDK-Debug-Options">
  <title><envar>GDK_DEBUG</envar></title>

  <para>
  If GTK+ has been configured with <option>--enable-debug=yes</option>,
  this variable can be set to a list of debug options, which cause GDK
  to print out different types of debugging information.
  <variablelist>
    <varlistentry>
      <term>misc</term>
      <listitem><para>Miscellaneous information</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>events</term>
      <listitem><para>Show all events received by GDK</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>dnd</term>
      <listitem><para>Information about drag-and-drop</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>xim</term>
      <listitem><para>Information about XIM support</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>nograbs</term>
      <listitem><para>Turn off all pointer and keyboard grabs</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>multihead</term>
      <listitem><para>Information related to multiple screens</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>xinerama</term>
      <listitem><para>Simulate a multi-monitor setup</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>cursor</term>
      <listitem><para>Information about cursor objects (only win32)</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>draw</term>
      <listitem><para>Information about drawing operations (only win32)</para></listitem>
    </varlistentry>
    <varlistentry>
      <term>eventloop</term>
      <listitem><para>Information about event loop operation (mostly Quartz)</para></listitem>
    </varlistentry>

  </variablelist>
  The special value <literal>all</literal> can be used to turn on all
  debug options.
  </para>
</formalpara>

<formalpara>
  <title><envar>GDK_NATIVE_WINDOWS</envar></title>

  <para>
    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.
  </para>
</formalpara>

<formalpara>
  <title><envar>XDG_DATA_HOME</envar>, <envar>XDG_DATA_DIRS</envar></title>

  <para>
    GTK+ uses these environment variables to locate icon themes
    and MIME information. For more information, see
    <ulink url="http://freedesktop.org/Standards/icon-theme-spec">Icon Theme Specification</ulink>,
    the <ulink url="http://freedesktop.org/Standards/shared-mime-info-spec">Shared MIME-info Database</ulink>
    and the <ulink url="http://freedesktop.org/Standards/basedir-spec">Base Directory Specification</ulink>.
  </para>
</formalpara>

</refsect2>

</refsect1>

</refentry>
