fig18_14.pl

PERL语言资料 可以用于PERL程序设计

#!/usr/bin/perl
# Fig. 18.14: fig18_14.pl
# Demonstrates using %SIG to define our own signal handlers.

use warnings;
use strict;

my $count = 3;
$| = 1;

$SIG{ 'INT' } = \&stop;

while ( $count ) {
   print( "Hooray!" );
   print( "\n" );
   sleep( 1 );
}

sub stop 
{
   $SIG{ 'INT' } = \&stop;
   $count--;
   print( "$count\n" );

   unless ( $count ) {
      print( "Sorry, I did not want to stop...\n" );
   }
}


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