Perhaps it is your shell. With a telnet client on windows to a remote Linux server this is a teletype when watched via putty. Maybe it is a BSD issue?

[root@devel3 james.freeman]# cat test.pl
#!/usr/bin/perl
use IO::Socket;
use IO::Select;
my $lsn = IO::Socket::INET->new(
    Listen    => 10,
    LocalAddr => '64.246.xx.xx',
    LocalPort => 9000
);
my $client = new IO::Select( $lsn );
while( my @ready = $client->can_read ) {
    for my $fh (@ready) {
        if($fh == $lsn) {
            warn "Accepted new socket\n";
            my $new = $lsn->accept;
            $client->add($new);
        }
        else {
            syswrite(STDOUT,$_,1) if sysread($fh,$_,1 );
        }
    }
}
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