Thanks! I reinvestigated the proper use of select and found I was using it wrong. My code now works without forking or pipes or anything other than Select!

use IO::Socket;
use IO::Select;
use IO::Handle;

$A_lsn = new IO::SOCKET::INET (LocalHost => 'localhost',
                           LocalPort => 1234,
                           Type      => SOCK_STREAM,
                           Proto     => "tcp",
                           Reuse     => 1,
                           Listen    => 5)
or die "A Server socket couldn't be created: $@\n";

$B_lsn = new IO::SOCKET::INET (LocalHost => 'localhost',
                           LocalPort => 5555,
                           Type      => SOCK_STREAM,
                           Proto     => "tcp",
                           Reuse     => 1,
                           Listen    => 5)
or die "B Server socket couldn't be created: $@\n";

my $sockets = new IO::Select();
$sockets->add($A);
$sockets->add($B);

while(@ready = $sockets->can_read) {
  foreach $sockets (@ready) {
    if ($sockets == $A_lsn) {    #new A client (sends data)
      $A_sock = $A_lsn->accept()
      $sockets->add($A_sock);
    } elsif($sockets == $B_lsn) {#new B client (recv data)
      $B_sock = $B_lsn->accept();
      $sockets->add($B_sock);
    } elsif($sockets == $A_sock) 
      #A client sent data, forward to all B clients
      $buf = <$A_sock>
      my @writers = $sockets->can_write;
      foreach $writer (@writers) {
        if ($writer == $A_sock) {
        #ignore
        } else {
          print $writer $buf;
        }
      }
  }
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