I do exactly the same thing you do, but instead of running the process every now and then, put a signal handler in front of it, and ...
.
.
.
while(1)
{
while(my $line=<$fh>)
{
# lot's o processing
}
sleep 5;
}
When I don't need or want to process anymore, just kill the process via the prepped signal handler, so i can clean up db handles or whatever i'm doing, gracefully.
Doesn't solve your exact problem, but gives you a new possibility.
-s
Play that funky music white boy..
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