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

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.