Questions about launchd
Questions about launchd
- Subject: Questions about launchd
- From: Michal Taurich <email@hidden>
- Date: Thu, 23 Aug 2007 03:38:08 +0200 (CEST)
Hello,
my name is Michal and I got contact to you from Peter Borg, creator of Lingon (launchd GUI interface). I am forwarding you my e-mail to him. It is not so much about Lingon it is basicaly about launchd. Any help in my cases will be appriciated. Thanks in advance.
Best Regards
Michal
Hello Peter,
first of all I would like to thank you for creating such amazing tool like
Lingon. It helps me very much. But I would like to ask you about one thing I
clearly not understand. I am using for monitoring software called RMA (
RMA 1.23 for Mac OS X 10.4 (i686) -
http://www.hostmonitor.biz/download/rma123_darwin88i32.zip). This is just an
agent for Mac OS X. I created launchd plist with your Lingon. I tried to create
"Keep an application/script always running" but when I look into Console it
creates some error (exactly "launchd: RMA Host Monitor Script: 9 more failures
without living at least 60 seconds will cause job removal ... will restart in 10
seconds). Unfortunately I am not able to find/log any significant error anywhere
(Console, sterr output even if I enable Debug option). So where can I find exactly
why the script / command failed? I also understand this is not problem
of Lingon but mostly launchd itself. I successfully create the plist (and keep it running)
only with "run a job at startup". But maybe you understand I want to be sure the RMA agent is
running and if there will be any unexpected failure the plist is strictly
written only "at startup" so that means during the cycle, the launchd didn't
check if the script is running or not. So is there any way how to monitor if the script is running
other than just look into launchctl and see it in list? Because I had several cases when
script was listed in launchctl but was not active (means script was not running).Or must I create
another bash script which will check if the process is running ? The RMA Agent is started with
following command line: ./rma -d ~/RMA/rma.ini (-d is daemon, rma.ini is
configuration file)
...and second thing. I used launchd also for moving some files to another
computer. You are using path called "Queue Directories". That means if anything
is placed into this directory (not sure about subdirectories, please confirm),
the script is launched. Unfortunately (I am not sure if it is also launchd
"feature" or not) if I am placing some big file (like pictures in print
resolution, but in this case just imagine DVD ISO image), the launchd (or
Lingon) isn't checking if the file is open or not. In my opinion it just
checking HFS+ header and if some file is added (means record for that file is
created - but not content) the script is launched which case in my example
"unable to copy because too much characters" error. I did it in my script with
checking "lsof" if the file is used or not. Isn't there any other way directly
in launchd or Lingon ?
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