Try trapping the following signals:

HUP, INT, QUIT, KILL, TERM, STOP, ABRT

One of those will probably do it but I'm not sure which.

To trap a signal, use the following:

$SIG{KILL} = sub {
  print "This is my signal handling code.  Log messages here.\n";
};
[download]

BTW, you can get a list (in the form of a single string separated by single spaces) of all the signals your system supports like this:

use Config;
print "$Config{sig_name}\n";
[download]

HTH

bbfu
Seasons don't fear The Reaper.
Nor do the wind, the sun, and the rain.
We can be like they are.