Rob Lockstone wrote:
> The preferred way to launch processes at boot/login in OS X since 10.4
> is to use launchd.
> From <http://developer.apple.com/MacOsX/launchd.html>, "/The launchd
> daemon takes over many tasks from cron, xinetd, mach_init, and init,
> which are UNIX programs that traditionally have handled system
> initialization, called system scripts, run startup items, and
> generally prepared the system for the user./"
> All well and good. It's a nice service and reasonably easy to manage,
> especially when using something like
> Lingon <http://www.macupdate.com/info.php/id/19879/lingon>. However,
> launchd has one feature that is annoyingly incompatible with Resin
> 4.x; it kills all child processes that the first process started when
> the first process exits.
Thanks. I've added this as a bug report. It might be possible to add a
"watchdog" argument like "console" for Mac (I'm not sure if the JNI will
get properly loaded in that case, but I'm sure there's a way to work
> Unfortunately, from what I can tell, this is exactly what Resin 4.x
> does. The ResinBoot class is responsible for creating the WatchDog
> process, and the WatchDog is what creates and then monitors the main
> Resin process, but after the WatchDog starts, ResinBoot exits so
> launchd kills the child processes.
> So what's a girl to do? I don't know. I'm not a girl. But here's what
> I did.
> Buried down in an Apple Developer Connection document, /Daemons and
> Agents/, is a section titled "Careful With That Fork, Eugene"
> <http://j.mp/bHw3XZ>. That's the section that explains how launchd
> will kill child processes if the original process exits. But it also
> lists a few work-arounds. The first two are specific to daemon and
> probably not doable for Resin, at least not without mucking around
> with Resin and rebuilding it. But the third, and of course
> the "least-preferable" by Apple's standards, is to use the
> AbandonProcessGroup property in Resin's startup plist file.
> Once you have your .plist file created (easy with Lingon), you can
> either edit it directly (it should be in /Library/LaunchDaemons), or
> within Lingon switch into "Expert Mode" and choose the
> /AbandonProcessGroup/ parameter from the "Insert parameter..." drop
> down. It will look like this in the plist file:
> Here's the definition of AbandonProcessGroup:
> AbandonProcessGroup <boolean>
> When a job dies, launchd kills any remaining processes with the
> same process group ID as the job. Setting this key to true disables
> that behavior.
> I can't say this is the best/only solution, but it worked for me.
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