On 17.10.2013 12:31, Patrick Ohly wrote:
For example, exclusive write access to the sqlite DB in EDS or the Tizen contacts service simplifies change notification, because a single process knows what changes are made at a semantic level and can send
By the way, easiest way to solve this for UI-less daemon services is to daemonize the service (disconnect stdio and call setsid()) and use one daemon per userid and then use a single per-user p2p dbus socket for communication instead of session bus. This way the service becomes per-user and not per-session and all sessions of single user can talk to the same daemon.
Or alternatively yuou could even expand this to have three dbus daemons and buses, "system", "session" and "user".
Like the system bus, user-bus services couldn't have GUIs, while the session-bus services can. This way you can easily make some of the existing services work even if they assume exclusive access to some files, as long as they don't try to have a GUI at the same time...
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