A) Super Search for daemon will find some nodes on writing perpetual "background" processes. There are some fiddly bits to look after, but Proc::Daemon will do a fine job of that for you.
B) A convenient way of using a lockfile is with sysopen;
sysopen my $fh, '/var/lock/mydaemon', O_EXCL | O_RDWR
or die "$0 is already running";
You should ensure that you call unlink '/var/lock/mydaemon';
in every exit path your code may take.
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