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href="glib-running.html#id2971016" title="Running and debugging GLib Applications"><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-compiling.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="glib.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-changes.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-running"></a><div class="titlepage"><div></div><div></div></div><div class="refnamediv"><h2><span class="refentrytitle">Running GLib Applications</span></h2><p>Running GLib Applications — How to run and debug your GLib application </p></div><div class="refsect1" lang="en"><a name="id2971016"></a><h2>Running and debugging GLib Applications</h2><div class="refsect2" lang="en"><a name="id2971022"></a><h3>Environment variables</h3><p> GLib inspects a few of environment variables in addition to standard variables like <tt class="envar">LANG</tt>, <tt class="envar">PATH</tt> or <tt class="envar">HOME</tt>. </p><p><a name="G_FILENAME_ENCODING"></a><b><tt class="envar">G_FILENAME_ENCODING</tt>. </b> This environment variable can be set to a comma-separated list of character set names. GLib assumes that filenames are encoded in the first character set from that list rather than in UTF-8. The special token "@locale" can be used to specify the character set for the current locale. </p><p><a name="G_BROKEN_FILENAMES"></a><b><tt class="envar">G_BROKEN_FILENAMES</tt>. </b> If this environment variable is set, GLib assumes that filenames are in the locale encoding rather than in UTF-8. G_FILENAME_ENCODING takes priority over G_BROKEN_FILENAMES. </p><p><b><tt class="envar">G_MESSAGES_PREFIXED</tt>. </b> A list of log levels for which messages should be prefixed by the program name and PID of the application. The default is to prefix everything except <tt class="literal">G_LOG_LEVEL_MESSAGE</tt> and <tt class="literal">G_LOG_LEVEL_INFO</tt>. </p><p><b><tt class="envar">G_DEBUG</tt>. </b> If GLib has been configured with <tt class="option">--enable-debug=yes</tt>, this variable can be set to a list of debug options, which cause GLib to print out different types of debugging information. </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term">fatal_warnings</span></td><td><p>Causes GLib to abort the program at the first call to <a href="glib-Message-Logging.html#g-warning">g_warning</a>(). This option is special in that it doesn't require GLib to be configured with debugging support.</p></td></tr></tbody></table></div><p> </p><p><b><tt class="envar">G_RANDOM_VERSION</tt>. </b> If this environment variable is set to '2.0', the outdated pseudo-random number seeding and generation algorithms from GLib-2.0 are used instead of the new better ones. Use the GLib-2.0 algorithms only if you have sequences of numbers generated with Glib-2.0 that you need to reproduce exactly. </p><p><b><tt class="envar">LIBCHARSET_ALIAS_DIR</tt>. </b> Allows to specify a nonstandard location for the <tt class="filename">charset.aliases</tt> file that is used by the character set conversion routines. The default location is the <i class="replaceable"><tt>libdir</tt></i> specified at compilation time. </p></div><hr><div class="refsect2" lang="en"><a name="id2971808"></a><h3>Traps and traces</h3><p> Some code portions contain trap variables that can be set during debugging time if GLib has been configured with <tt class="option">--enable-debug=yes</tt>. Such traps lead to immediate code halts to examine the current program state and backtrace. </p><p> Currently, the following trap variables exist: </p><pre class="programlisting"> static volatile gulong g_trap_free_size; static volatile gulong g_trap_realloc_size; static volatile gulong g_trap_malloc_size; </pre><p> If set to a size > 0, <a href="glib-Memory-Allocation.html#g-free">g_free</a>(), <a href="glib-Memory-Allocation.html#g-realloc">g_realloc</a>() and <a href="glib-Memory-Allocation.html#g-malloc">g_malloc</a>() will be intercepted if the size matches the size of the corresponding memory block. This will only work with <tt class="literal">g_mem_set_vtable (glib_mem_profiler_table)</tt> upon startup though, because memory profiling is required to match on the memory block sizes. </p></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-compiling.html"><b><< Compiling GLib Applications</b></a></td><td align="right"><a accesskey="n" href="glib-changes.html"><b>Changes to GLib >></b></a></td></tr></table></body></html>