def main():
    try:
        netns.increase_ulimit(RLIMIT_NOFILE_LIMIT)
    except Exception:
        LOG.error(_LE('Failed to increase ulimit for DHCP relay'))
    eventlet.monkey_patch()
    cfg.CONF.register_opts(OPTS, 'cisco_pnr')
    cfg.CONF(project='neutron')
    config.setup_logging()
    if os.getuid() is 0:
        LOG.error(_LE('Must run dhcp relay as root'))
        return
    relay = DhcpRelayAgent()
    relay.serve()
dataset/ETHPy150Open openstack/networking-cisco/networking_cisco/plugins/cisco/cpnr/dhcp_relay.py/main/operator `!=` -> `is`