Yaping Li
1f9fb6300b
The Varlink ListSessions method accepts optional Id and PID filters, folding in the D-Bus GetSession(s) and GetSessionByPID(u) lookups. Passing a unique-key filter (Id and/or PID) yields a single reply on match, or NoSuchSession on miss. Passing no filter streams the full list (requires the 'more' flag). Specifying both Id and PID acts as a consistency check: both must refer to the same session, otherwise NoSuchSession is returned. The Id filter supports the special names "self" and "auto" which resolve to the caller's session. The SessionInfo type in the io.systemd.Login Varlink IDL carries all session properties matching the D-Bus org.freedesktop.login1.Session interface.
System and Service Manager
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