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$SIG{ALRM} = sub {
   print "Alarming!\n";
};

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> perl -MConfig -e "print $Config{sig_name}"
ZERO HUP INT QUIT ILL NUM05 NUM06 NUM07 FPE KILL NUM10 SEGV NUM12 PIPE
+ ALRM TERM
 NUM16 NUM17 NUM18 NUM19 CHLD BREAK ABRT STOP NUM24 CONT CLD