I am having trouble getting iteration to work over a tied array. The array in question is tied via some methods to provide the pids of all child proccesses of the current proccess. The Nanny package implements the array by parsing output from the ps command.So this isn't very portable, yet I have tried it and it works on solaris 2.6+ and redhat 7 (except iteration which just doesn't work). Example code and the package that implements the tie follows. Anybody know what I am doing wrong? Thanks---

#!/usr/bin/perl
#Package Nanny provides methods to  tie an array.
#The methods fill a tied array  with the pids of the  
#non zombie children of the current proccess in real time.
#I can't seem to get iteration to work. 

#example code: Make a few eternally looping kids, get pids.
 tie my @kids, 'Nanny'; 
if($pid = fork)
{ push @pids,$pid;
    if($pid = fork)
    { push @pids,$pid;
      if($pid = fork)
    { 
      push @pids,$pid;
    }
    else{while(1){}}
    }
    else{while(1){}}
}
    else{ exit; }
if ($pid){
    print "supposed number:". @pids. " real time number:".scalar @kids
+ ."pids @kids";
}

#this does not work
#    for(1..@kids){
#    waitpid($kids[$_],0);
#    }
#and this doesn't either
# foreach(@kids){
#    waitpid($_,0);
#    }
#
#and not this either
#foreach(@kids){
#    print $_;
#    }

#Nanny package:
package Nanny;
use Tie::Array;
use strict;
our @ISA = ('Tie::StdArray');

sub TIEARRAY{
    my ($self) = shift;
      my @real_pids;
    bless \@real_pids, $self;
    return \@real_pids;
}

sub FETCHSIZE {
    my ($self) = shift;
    my $masterpid = $$;
    my @real_pids;
    open(PS,"ps -e -o ppid -o pid -o tty -o comm | ");
    my $l;
    while(<PS>){
    $l++;
    next if $l == 1;
    my    @procs = split(' ',$_);
    next if (defined($procs[3]) && $procs[3] eq 'ps');
    if ($procs[0] == $masterpid && $procs[2] =~ /\?/)
    {
        waitpid($procs[1],0);
        next;
    }
    if ($masterpid == $procs[0]){
        push @real_pids,$procs[1];
    }
    }
    close PS;
    return scalar @real_pids ;
}

sub FETCH {
    my ($self,$idx) = shift;
    unless(defined $idx){
    $idx = 0;
    }
    my $masterpid = $$;
    my @real_pids;
    open(PS,"ps -e -o ppid -o pid -o tty -o comm | ");
    my $l;
    while(<PS>){
    $l++;
    next if $l == 1;
    my    @procs = split(' ',$_);
    next if (defined($procs[3]) && $procs[3] eq 'ps');
    if ($procs[0] == $masterpid && $procs[2] =~ /\?/)
    {
        waitpid($procs[1],0);
        next;
    }
    if ($masterpid == $procs[0]){
        push @real_pids,$procs[1];
    }
    }
    close PS;   
    return $real_pids[$idx];
}
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