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Writing a Perl Daemonby tomazos (Deacon)
|on Jul 28, 2005 at 06:09 UTC||Need Help??|
tomazos has asked for the
wisdom of the Perl Monks concerning the following question:
I have a script that does some stuff in a tight loop and than sleeps at the end of each loop for an unpredicatable amount of time (few seconds to few minutes).
(A) I want it to run continuously in the background
(B) I don't want to accidentally run two of them at the same time.
(C) I want it to automatically come back alive after system boot.
(D) It might accidentally get killed, so I want it to be able to tollerate that.
My guesses are as follows:
? Open a dummy lock file when the script starts and don't close it? Die if you cant open it? Code for this? open or die?
? Edit some kind of file in my /home/andrew directory that gets automatically executed and run it with a trailing &? to run in the background.
Will this satisfy the above requirements?
Update: It's not a networking or IP related program. Sorry, the daemon title through you off. I meant it in the sense of a program that stays uniquely alive. I guess daemon's accepted meaning is something small that listens on a port like daytime or ntp - this is not what I mean.