The default behavior of systemd is to remove shared memory
files when the user that created them logs out. This breaks
instance ID tracking for most installations. While its possible
to overcome this by changing the user type or the logind
configuration, these solutions required elevated privileges.
The simple solution is to store iids in a temporary file, with
access protected by a flock.
Signed-off-by: Eric Callahan <arksine.code@gmail.com>
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