Hi there I had to modify the code you recommended I run because it was giving me the following error: 
Invalid version format (non-numeric data) at perlmonkII.pl line 7, nea
+r "package SpyHash "
syntax error at perlmonkII.pl line 9, near "package SpyHash {

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so I modified it to: 
use v5.12;
use strict;
use warnings;

package SpyHash;

use Tie::Hash; # for Tie::StdHash
use Carp qw( carp );

our @ISA=qw( Tie::StdHash );

sub STORE{
        my ($self,$key,$value)=@_;
        $key=~/^CH?LD$/ and carp "Assign to key $key";
        return $self->SUPER::STORE($key,$value);
    }

sub DELETE
    {
        my ($self,$key)=@_;
        $key=~/^CH?LD$/ and carp "Delete key $key";
        return $self->SUPER::DELETE($key);
    }

   1;


package main;

tie %SIG,'SpyHash';

$SIG{'CHLD'}=sub { 'just a dummy' }; # this line should be reported
require Net::DNS; # Any module messing with $SIG{'CHLD'} should be rep
+orted from here
Net::DNS->import(); # ... or here

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Then I ran this code on perl v.12.5 and I got 
Assign to key CHLD at perlmonkII.pl line 34

[download]

In reply to Re^4: SIG{CHLD} altered by require statement on Perl 5.12.1 by sdingare
in thread SIG{CHLD} altered by require statement on Perl 5.12.1 by sdingare

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