Re: Question on using launchd from a C program
Re: Question on using launchd from a C program
- Subject: Re: Question on using launchd from a C program
- From: Mike Kobb <email@hidden>
- Date: Thu, 8 Jun 2006 19:09:38 -0700
Thanks for that! I did consider the login/logout hooks, and I think
they could well work, but to install them you need administrator
privileges, and ideally I would not like to have to have the user
have to authenticate to set up the login behavior.
I think what I'm going to do instead is write a very simple faceless
app that will be set as a login item. It will launch my server when
it launches at login (if the user chose login-time launch), and at
logout it'll find the server and tell it to quit. Should be very
straightforward, and has the advantage (compared to launchd) of
working on older OSes as well.
Appreciate the suggestion.
--Mike
On Jun 8, 2006, at 6:38 PM, Andre LaBranche wrote:
On Jun 8, 2006, at 6:04 PM, Mike Kobb wrote:
Unfortunately, I need this to work, well, today if possible. ;-)
I'm sorry if I mis-typed. It's login and logout that I care
about. Not boot or shutdown (except insofar as shutdown implies
logout). I want them to be able to choose to launch it at login,
or do it manually. Then, if it's running when they log out
(whichever of those two methods they chose), I want it to quit.
...
Perhaps a loginhook / logouthook would work for the interim?
http://developer.apple.com/documentation/MacOSX/Conceptual/
BPSystemStartup/Articles/CustomLogin.html
Cheers,
-Andre
On Jun 8, 2006, at 4:37 PM, Dave Zarzycki wrote:
Will you be attending WWDC?
Can you wait for Leopard?
Why the asymmetric requirement of launching at boot, but exiting
at logout (as opposed to at boot/shutdown or login/logout)?
davez
On Jun 8, 2006, at 3:55 PM, Mike Kobb wrote:
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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