unless (fork) { # this is the child
  unless (fork) {  # this is the grandchild
    # Do your request processing here ...
     my $exec = "/usr/local/bin/monster -i$id $filePath$file &";
     qx/$exec/;
    exit 0;
  }                     # end grandchild
  # Child process just exits.
  exit 0;
}
# Parent reaps quick-exiting child.
wait;