Don't ignore all dbus connection errors
Previous commit commit 7ada155c Author: Gao feng <gaofeng@cn.fujitsu.com> Date: Wed Sep 11 11:15:02 2013 +0800 DBus: introduce virDBusIsServiceEnabled Made the cgroups code fallback to non-systemd based setup when dbus is not running. It was too big a hammer though, as it did not check what error code was received when the dbus connection failed. Thus it silently ignored serious errors from dbus such as "too many client connections", which should always be treated as fatal. We only want to ignore errors if the dbus unix socket does not exist, or if nothing is listening on it. Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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