_process.py 文件源码

def _get_ports_in_use(cls):
    """
    Returns a set of ports currently used on localhost.
    """
    try:
      return set([x.laddr[1] for x in psutil.net_connections(kind='inet4')])
    except psutil.AccessDenied:
      # On some platforms (such as OS X), root privilege is required to get used ports.
      # In that case we avoid port confliction to the best of our knowledge.
      _logger.info('ports in use cannot be obtained on this platform; ports will be assigned sequentially')
      return set()