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libunique offers 'unique application' support as well as ways to communicate with a running application instance. This is implemented in various ways, either using D-Bus, or socket-based communication.
Starting with GLib 2.26, D-Bus support has been integrated into GIO in the form of GDBus, and GApplication has been added to provide the same level of application support as libunique.
Example 52. A unique application
Here is a simple application using libunique:
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The same application using GtkApplication:
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Instead of creating a UniqueApp with unique_app_new(), create
a GApplication with g_application_new() or a GtkApplication
with gtk_application_new(). The name that was used with
unique_app_new() is very likely usable as the application_id for
g_application_new() without any changes, and GtkApplication passes
the DESKTOP_STARTUP_ID environment variable
automatically.
While libunique expects you to check for an already running instance
yourself and activate it manually, GApplication handles all this on
its own in g_application_run(). If you still need to find out if there
is a running instance of your application, use
g_application_get_is_remote() instead of unique_app_is_running().