Programming Perl, 4th Edition

Predefined Signal Lists

The sigtrap pragma has a few built-in lists of signals to trap:

normal–signals

These are the signals a program might normally expect to encounter, which, by default, cause it to terminate. They are the HUP, INT, PIPE, and TERM signals.

error–signals

These are the signals that usually reflect a serious problem with the Perl interpreter or with your program. They are the ABRT, BUS, EMT, FPE, ILL, QUIT, SEGV, SYS, and TRAP signals.

old–interface–signals

These are the signals that were trapped by default under an older version of sigtrap’s interface. They are ABRT, BUS, EMT, FPE, ILL, PIPE, QUIT, SEGV, SYS, TERM, and TRAP. If no signals or signals lists are passed to use sigtrap, this list is used.

If your platform does not implement a particular signal named in the predefined lists, that signal name will be silently ignored. (The signal itself can’t be ignored because it doesn’t exist.)