Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Re: Question On signals in perl

by SimonClinch (Chaplain)
on Aug 01, 2005 at 13:37 UTC ( #479892=note: print w/ replies, xml ) Need Help??

in reply to Question On signals in perl

A signal is notification to the process of a (nominally) asynchronous event. Examples are:

INT - the process has been interrupted e.g. by ctrl/c

HUP - the attached terminal session has disconnected ("been hanged up")

PIPE - a broken pipe has been detected

TERM - synchronous termination has been requested

and so on.

A simple listing of all signal names can be found by:

perl -e 'use Data::Dumper; print Dumper( \%SIG );'
The default signal handler (which generally just terminates the process as soon as it is invoked) can instead be trapped to your own code (sometimes called an AST or asynchronous system trap) by defining a routine reference as the relevant value in the %SIG hash, e.g.
$SIG{ HUP } = \&MyNoHup;
$SIG{ PIPE } = sub { warn ( "Broken pipe ignored; traceback follows:\n +" . Devel::trace() ); }
There are some modules which also assist signal handling, including POSIX

One world, one people

Comment on Re: Question On signals in perl
Select or Download Code

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://479892]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (4)
As of 2015-11-25 03:42 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (670 votes), past polls