sigtrap(3)

NNAAMMEE
       sigtrap - Perl pragma to enable simple signal handling

SSYYNNOOPPSSIISS
           use sigtrap;
           use sigtrap qw(stack-trace old-interface-signals);  # equivalent
           use sigtrap qw(BUS SEGV PIPE ABRT);
           use sigtrap qw(die INT QUIT);
           use sigtrap qw(die normal-signals);
           use sigtrap qw(die untrapped normal-signals);
           use sigtrap qw(die untrapped normal-signals
                           stack-trace any error-signals);
           use sigtrap 'handler' => \&my_handler, 'normal-signals';
           use sigtrap qw(handler my_handler normal-signals
                           stack-trace error-signals);

DDEESSCCRRIIPPTTIIOONN
       The ssiiggttrraapp pragma is a simple interface to installing
       signal handlers.  You can have it install one of two
       handlers supplied by ssiiggttrraapp itself (one which provides a
       Perl stack trace and one which simply die()s), or
       alternately you can supply your own handler for it to
       install.  It can be told only to install a handler for
       signals which are either untrapped or ignored.  It has a
       couple of lists of signals to trap, plus you can supply
       your own list of signals.

       The arguments passed to the use statement which invokes
       ssiiggttrraapp are processed in order.  When a signal name or the
       name of one of ssiiggttrraapp's signal lists is encountered a
       handler is immediately installed, when an option is
       encountered it affects subsequently installed handlers.

OOPPTTIIOONNSS
       SSIIGGNNAALL HHAANNDDLLEERRSS

       These options affect which handler will be used for
       subsequently installed signals.

       ssttaacckk--ttrraaccee
           The handler used for subsequently installed signals
           outputs a Perl stack trace to STDERR and then tries to
           dump core.  This is the default signal handler.

       ddiiee The handler used for subsequently installed signals
           calls die (actually croak) with a message indicating
           which signal was caught.

       hhaannddlleerr your-handler
           your-handler will be used as the handler for
           subsequently installed signals.  your-handler can be
           any value which is valid as an assignment to an
           element of %SIG.

       SSIIGGNNAALL LLIISSTTSS

       ssiiggttrraapp has a few built-in lists of signals to trap.  They
       are:

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

       eerrrroorr--ssiiggnnaallss
           These signals usually indicate a serious problem with
           the Perl interpreter or with your script.  They are
           ABRT, BUS, EMT, FPE, ILL, QUIT, SEGV, SYS and TRAP.

       oolldd--iinntteerrffaaccee--ssiiggnnaallss
           These are the signals which were trapped by default by
           the old ssiiggttrraapp interface, they are ABRT, BUS, EMT,
           FPE, ILL, PIPE, QUIT, SEGV, SYS, TERM, and TRAP.  If
           no signals or signals lists are passed to ssiiggttrraapp,
           this list is used.

       For each of these three lists, the collection of signals
       set to be trapped is checked before trapping; if your
       architecture does not implement a particular signal, it
       will not be trapped but rather silently ignored.

       OOTTHHEERR

       uunnttrraappppeedd
           This token tells ssiiggttrraapp to install handlers only for
           subsequently listed signals which aren't already
           trapped or ignored.

       aannyy This token tells ssiiggttrraapp to install handlers for all
           subsequently listed signals.  This is the default
           behavior.

       signal
           Any argument which looks like a signal name (that is,
           /^[A-Z][A-Z0-9]*$/) indicates that ssiiggttrraapp should
           install a handler for that name.

       number
           Require that at least version number of ssiiggttrraapp is
           being used.

EEXXAAMMPPLLEESS
       Provide a stack trace for the old-interface-signals:

           use sigtrap;

       Ditto:

           use sigtrap qw(stack-trace old-interface-signals);

       Provide a stack trace on the 4 listed signals only:

           use sigtrap qw(BUS SEGV PIPE ABRT);

       Die on INT or QUIT:

           use sigtrap qw(die INT QUIT);

       Die on HUP, INT, PIPE or TERM:

           use sigtrap qw(die normal-signals);

       Die on HUP, INT, PIPE or TERM, except don't change the
       behavior for signals which are already trapped or ignored:

           use sigtrap qw(die untrapped normal-signals);

       Die on receipt one of an of the nnoorrmmaall--ssiiggnnaallss which is
       currently uunnttrraappppeedd, provide a stack trace on receipt of
       aannyy of the eerrrroorr--ssiiggnnaallss:

           use sigtrap qw(die untrapped normal-signals
                           stack-trace any error-signals);

       Install my_handler() as the handler for the nnoorrmmaall--
       ssiiggnnaallss:

           use sigtrap 'handler', \&my_handler, 'normal-signals';

       Install my_handler() as the handler for the normal-
       signals, provide a Perl stack trace on receipt of one of
       the error-signals:

           use sigtrap qw(handler my_handler normal-signals
                           stack-trace error-signals);