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Re: how to exit if tool is already running

by sflitman (Hermit)
on Aug 12, 2010 at 05:58 UTC ( #854586=note: print w/ replies, xml ) Need Help??

in reply to how to exit if tool is already running

Check out the excellent CPAN module Sys::RunAlone, it should help fix this problem. It cleverly locks your scripts DATA handle to prevent another invocation of the same script doing so. It's cross-Unix, but you'd need something fancier on Windows.


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Re^2: how to exit if tool is already running
by JavaFan (Canon) on Aug 12, 2010 at 09:18 UTC
    Considering flocking the data handle only takes a single line, there isn't much to gain from using a module (the module does more, but the OP doesn't need that). After ending the script with __DATA__ (or __END__), just add:
    flock DATA, 6 or die "Duplicate instance";
    Or use the Fnctl module and use LOCK_EX|LOCK_NB instead of 6.

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