Start systemd service from C/C++ application or call a D-Bus service

Question

I have a .service for a process that i don\'t want to start at boot-time, but to call it somehow from another already running application, at a given time.

The other

Answer 1

I had trouble to do the same thing. The discover of : G_BUS_NAME_WATCHER_FLAGS_AUTO_START solve it.

g_bus_watch_name(G_BUS_TYPE_SYSTEM, "com.mydbus.listen",
      G_BUS_NAME_WATCHER_FLAGS_AUTO_START, xOnNameAppeared, xOnNameVanished,
      this, nullptr);

Answer 2

A combination of g_dbus_connection_send_message with g_dbus_message_new_method_call or g_dbus_message_new_signal should be what you are looking for.