Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
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.


Andrew Tomazos  |  |

In reply to Writing a Perl Daemon by tomazos

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others meditating upon the Monastery: (3)
As of 2022-05-19 23:06 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (72 votes). Check out past polls.