© 2008 Nokia Corporation. All rights reserved. This documentation can be used in the connection with this Product to help and support the user.
GLib inspects a few of environment variables in addition to standard
variables like LANG, PATH
or HOME.
G_FILENAME_ENCODING.
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.
G_BROKEN_FILENAMES.
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.
G_MESSAGES_PREFIXED.
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 G_LOG_LEVEL_MESSAGE and
G_LOG_LEVEL_INFO.
G_DEBUG. If GLib has
been configured with --enable-debug=yes, this
variable can be set to a list of debug options, which cause GLib to print out
different types of debugging information.
| fatal_warnings |
Causes GLib to abort the program at the first call to g_warning() or g_critical(). This option is special in that it doesn't require GLib to be configured with debugging support. |
| fatal_criticals |
Causes GLib to abort the program at the first call to g_critical(). This option is special in that it doesn't require GLib to be configured with debugging support. |
| gc-friendly | Newly allocated memory that isn't directly initialized, as well as memory being freed will be reset to 0. The point here is to allow memory checkers and similar programs that use bohem GC alike algorithms to produce more accurate results. This option is special in that it doesn't require GLib to be configured with debugging support. |
G_SLICE.
This environment variable allows reconfiguration of the #GSlice
memory allocator.
| always-malloc | This will cause all slices allocated through g_slice_alloc() and released by g_slice_free1() to be actually allocated via direct calls to g_malloc() and g_free(). This is most useful for memory checkers and similar programs that use bohem GC alike algorithms to produce more accurate results. It can also be in conjunction with debugging features of the system's malloc implementation such as glib's MALLOC_CHECK_=2 to debug erroneous slice allocation code. |
G_RANDOM_VERSION. 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.
LIBCHARSET_ALIAS_DIR. Allows to specify a
nonstandard location for the charset.aliases
file that is used by the character set conversion routines. The default location
is the libdir
specified at compilation time.
G_WIN32_PRETEND_WIN9X.
Setting this variable to any value forces g_win32_get_windows_version() to
return a version code for Windows 9x. This is mainly an internal debugging aid
for GTK+ and GLib developers, to be able to check the code paths for Windows 9x.
Some code portions contain trap variables that can
be set during debugging time if GLib has been configured with
--enable-debug=yes. Such traps lead to immediate code halts to examine
the current program state and back trace.
Currently, the following trap variables exist:
static volatile gulong g_trap_free_size;
static volatile gulong g_trap_realloc_size;
static volatile gulong g_trap_malloc_size;
If set to a size > 0, g_free(),
g_realloc() and g_malloc() will be intercepted
if the size matches the size of the corresponding memory block. This will only
work with g_mem_set_vtable (glib_mem_profiler_table)
upon startup though, because memory profiling is required to match on the memory
block sizes.
Note that many modern debuggers support conditional breakpoints, which achieve pretty much the same. E.g. in gdb, you can do
break g_malloc condition 1 n_bytes == 20
to break only on g_malloc() calls where the size of the allocated memory block is 20.
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© 2008 Nokia Corporation. All rights reserved. This documentation can be used in the connection with this Product to help and support the user. |
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