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| hand waving here
my $a=1;
...
         $a=3;
}
| etc.

       SIGUSR1     30    user defined signal 1
       SIGUSR2     31    user defined signal 2

       SIGUSR1   30,10,16    Term    User-defined signal 1
       SIGUSR2   31,12,17    Term    User-defined signal 2

# handwaving
if ( fork() ){
...
     # child
     $SIG{USR1} =\&childHandler;
}