I'm working on a preference pane that is used to configure the
options of a faceless background process (a music server).
This process is a BSD process for historical reasons, but will run
under the privileges of a particular user, and not as root.
So, I want to make it into a "UserAgent", to start when the user logs
in and quit when they log out.
I would also like to be able to have the server be manually launched,
but still quit when the user logs out.
I have figured out how to create the appropriate plist to make the
server launch at login and quit at shutdown, and that seems to work
fine.
So, I have two questions:
1) Is it possible to set up launchd to not launch the process at
login, but to shut it down at logout?
2) I want this all to be controlled by my preference pane.
Obviously, it's no trouble to get it to write out the required plist
file, but the part I'm not sure about is how to do the equivalent of
a "launchctl load" or "launchctl unload" operation. I could exec
this, I guess, but I prefer to use a proper C API rather than the
exec mechanism whenever I can.
Thanks in advance,
--Mike
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