Question on using launchd from a C program
Question on using launchd from a C program
- Subject: Question on using launchd from a C program
- From: Mike Kobb <email@hidden>
- Date: Thu, 8 Jun 2006 15:55:43 -0700
Greetings,
I'm working on a MacOS 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.
I want to have a pop-up in the prefs pane that allows the user to
choose to manually launch the server (by clicking a "Start" button in
the pane, or to have the server launch at startup. Either way, I
want to be sure that the server quits when they log out.
It seems like launchd is likely to be what I want, but there are a
few things I could use some help with.
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. I couldn't make heads or tails out of
launch.h, I'm afraid.
Thanks in advance,
--Mike
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