Hello. I'm running Xorg and my (Qt) program daemonises itself. Now I log out and restart the X server. When I log in again my process is still running fine, but I can't see it.
Is there a way of attatching the new incarnation of the X server to the old process? If I don't restart the whole server, but log out and in again, is there a way to look at the old process?
Thanks
probably your best bet is to separate the application into 2 parts. One would be a GUI-less daemon, the other would be a this GUI client which using DBUS or some other API to communicate with the daemon.
After the connection to the X server is lost, it is not possible to regain it.
There was an xserver proxy called xmove, but it is quite deprecated and doesn't work with several newer X extension, which are likely used by modern toolkits.
You could try to run your process in another virtual X server like xvnc or (better) NX. NX is a X proxy technology developed by NoMachine. There exist free implementations of NX servers as well. If you run your program inside such a server, it is possible to attach and detach from it from arbitrary graphical environments.
These guys say that it is possible, I have not tested that functionality...