def _ra_pid_for(dev):
    pid_file = _ra_file(dev, 'pid')

    if os.path.exists(pid_file):
        with open(pid_file, 'r') as f:
            return int(f.read())
Returns the pid for prior radvd instance for a bridge/device.
dataset/ETHPy150Open openstack/nova/nova/network/linux_net.py/_ra_pid_for