where create the socket file "/var/run/dbus/system_bus_socket"

[yimao]

Hi,all.
I use Fedora 19  try to write some selinux policy based on MDP.
There's something wrong when the system starts , and I found this error
message
"systemd:Failed to open private bus connection:Failed to connect to socket
/var/run/dbus/system_bus_socket:No such file or directory"

I want to know who and when create this socket file to find what's wrong
with my policy. I had some tries but nothing found.
can someone give me some advice.

ps:the dbus version is 1.6.8.

Thanks.
yimao

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