[Chapter 8] 8.131 sigtrap

8.131 sigtrap

Pragma to enable simple signal handling. Provides two signal handlers that can be installed, or you can install your own handler; also provides options to specify which signals to trap. Ignores requests to trap signals not used in your system's architecture.

use sigtrap;               # initialize default signal handlers
use sigtrap qw(die normal-signals);
use sigtrap 'handler' => \handlername, 'normal-signals';
use sigtrap qw(handler handlername normal-signals
               stack-trace error-signals);

8.131.1 Signal Handler Options

Used to specify which handler is to be installed and used for signals installed after the handler:

die: Installs handler that dies with a message indicating what signal was trapped.
handler handlername: Installs your handler handlername.
stack-trace: Default signal handler. Outputs stack trace to STDERR and tries to dump core.

8.131.2 Signal List Options

You can specify your own list of options:

use sigtrap qw(BUS SEGV PIPE ABRT);

or use one of the following built-in option lists:

error-signals: Signals that indicate a serious problem: ABRT, BUS, EMT, FPE, ILL, QUIT, SEGV, SYS, and TRAP.
normal-signals: Signals a program is most likely to encounter: HUP, INT, PIPE, and TERM.
old-interface-signals: Default. Signals trapped by default in older versions of sigtrap: ABRT, BUS, EMT, FPE, ILL, PIPE, QUIT, SEGV, SYS, TERM, and TRAP.

8.131.3 Other Options

any: Installs handlers only for subsequently listed signals that aren't already taken care of.
number: Requires that the version of sigtrap being used must be at least number.
signal: Installs a handler for any argument that looks like a signal name.
untrapped: Installs handlers only for subsequently listed signals not already trapped or ignored.


8.130 Shell		8.132 Socket