Hi everyone,
I have two processes - a user process and a root-level LaunchDaemon.
I'd like both processes to have shared settings. I've tried getting
this to work via a sqlite database, but have run into corruption
issues. I've thought about using NSUserDefaults, but the
NSGlobalDomain seems to only be global for the user, and I need a
cross-user persistent domain, which NSUserDefaults doesn't seem to
provide.
I've tried reading and writing an XML file directly, and I can get
this to work fine with multiple threads (via a simple NSLock), but
when I attempt to apply an O_EXLOCK to the file to prevent one process
from writing to the file while the other is, but it doesn't seem to be
working.
CFPreferences seems to have most of the same issues as
NSUserDefaults. There is a "kCFPreferencesAnyUser" constant, but the
documentation says that I can only use that if I have admin privileges
(which the user process does not have).
So my question is this:
How can I effectively implement cross-process and cross-user shared
settings?
Thanks,
Dave
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