Re: Debugging a lanuchd daemon
Re: Debugging a lanuchd daemon
- Subject: Re: Debugging a lanuchd daemon
- From: Dustin Norman <email@hidden>
- Date: Tue, 30 Oct 2007 10:54:50 -0400
Steve,
You can add a boolean value to your launchd plist file called
WaitForDebugger that should pause the process before main has been
called. See man launchd.plist for more information.
One word of caution, if you are using Xcode 3.0 this may not work. At
least I haven't been able to get it to work. Xcode attaches but there
are errors and it's not possible to debug. Attaching with gdb from
the command-line does work but it obviously isn't the best debugging
environment.
I have not tried this on Tiger so I don't know if this problem exists
with Xcode 2.4.
HTH,
Dustin
On Oct 30, 2007, at 10:39 AM, Steve Sisak wrote:
I'm in the process of converting a StartupItem (which I could just
run to debug) to a launch-on-demand daemon that will be
automatically launched when a Unix-domain socket it registers is
accessed.
I'd like to debug the launch code when it's launched by launchctl,
but obviously can't attach to the process because it isn't running
yet.
Is there a way to get Xcode to debug a process upon launch or other
practical techinique to use here?
(I can always put the process in an infinite loop and attach to it)
Also, the daemon will normally be run as root (although I'm pretty
sure I can test it in user space for the time being).
How would one debug a priviledged daemon with Xcode? (2-machine
debugging?)
Suggestions and best practice welcome.
Thanks,
-Steve
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