Can someone please explain why why the following code doesn't work as intended? It works fine on UNIX (Perl 5.8.0 on Sun Solaris 2.6 and 8), but not on cursed Windows: 
#!perl

use strict;

use Errno qw( EAGAIN      );
use POSIX qw( strftime    );
use POSIX qw( :sys_wait_h );

use Data::Dumper;

my $childPid;
my %reapedChildren = ();

FORK: {

   local $SIG{ CHLD } = \&reaper;

   if ( $childPid = fork ) { # parent code
      sleep 1 until ( %reapedChildren );
      print Dumper \%reapedChildren;
      exit 0;
   } elsif ( defined $childPid ) { # child code
      system 'cd';
      system 'sleep 3';
      system 'cd';
   } elsif ( $! == EAGAIN ) {
      sleep 5;
      redo FORK;
   } else { # unknown fork error
      die "can't fork: $!\n";
   }
}

sub reaper {
   my $pid = 0;
   while ( $pid != -1 ) {
      $pid = waitpid( -1, &POSIX::WNOHANG );
      $reapedChildren{ $pid } = 1 if ( $pid > 0 );
   }
}

In reply to fork() and signal handlers on Windows by BunMan

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