my $rv = $handle->sysread($bufline, 4096);
    $line .= $bufline;
    while ($rv == 4096) {
      $rv = $handle->sysread($bufline, 4096);
      $line .= $bufline unless !$rv;
    }

##</code><code>##

- While there are handles from which to read,
  - Wait for data to arrive.
  - Read into the handle's buf.
    -> Don't forget to handle eof and error.
  - While the buf has a full command,
    - Remove the command from the buf.
    - Process the command.

##</code><code>##

    my $bufline = "";
    my $rv = $handle->sysread($bufline, 4096);
    $line .= $bufline;

##</code><code>##

    my $rv = $handle->sysread($line, 4096, length($line));