On my system at least, you can't catch KILL. This code prints KILL signal caught when KILL is caught: 
[gifford@gifford gifford]$ perl -e'$SIG{KILL}=sub { die "KILL signal c
+aught"; }; sleep(10)' &
[1] 4316
[gifford@gifford gifford]$ kill -9 4316
[gifford@gifford gifford]$
[1]+  Killed                  perl -e'$SIG{KILL}=sub { die "KILL signa
+l caught"; }; sleep(10)'

[download]

In reply to Re^2: killing perl scripts by sgifford
in thread killing perl scripts by rsiedl

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