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  1. or download this
    void interruptHandler();
int setInterrupt(int pin, int edge, char *callback);
...

void
interruptHandler()
  2. or download this
    sub set_interrupt {
    shift if @_ == 4;
    my ($pin, $edge, $callback) = @_;
    setInterrupt($pin, $edge, $callback);
}
  3. or download this
    use warnings;
use strict;
...
    print "pin 27 edge rise callback...\n";
    # do other stuff
}