$ perl -E 'say "$_ => $SIG{$_}" for sort {$a cmp $b} keys %SIG'
ABRT =>
ALRM =>
BUS =>
CHLD =>
CLD =>
CONT =>
FPE => IGNORE
HUP =>

...

UNUSED =>
URG =>
USR1 =>
USR2 =>
VTALRM =>
WINCH =>
XCPU =>
XFSZ =>