问题
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 option would be to put a D-Bus (i'm using glib dbus in my apps ) service file in /usr/share/dbus-1/services and somehow call it from my application. Also, i don't manage to do this either.
Let's say that my dbus service file from /usr/share/dbus-1/services is com.callThis.service
and my main service file from /lib/systemd/system is com.startThis.service
If i run a simple introspect from command line:
/home/root # dbus-send --session --type=method_call --print-reply \
--dest=com.callThis /com/callThis org.freedesktop.DBus.Introspectable.Introspect
the D-Bus service file will get called and it will start what is in the Exec ( com.starThis ). The problem is that i want to achieve this from C/C++ code using D-Bus glib.
回答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.
回答2:
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);
来源：https://stackoverflow.com/questions/13843093/start-systemd-service-from-c-c-application-or-call-a-d-bus-service