utils.py 文件源码

def get_free_port(port, port_retries):
    for port in random_ports(port, port_retries+1):
        try:
            s = socket.socket()
            s.bind(('', port))
            port = s.getsockname()[1]
            s.close()
            return port
        except socket.error as e:
            if e.errno == errno.EADDRINUSE:
                print('The port %i is already in use, trying another port.' % port)
                continue
            elif e.errno in (errno.EACCES, getattr(errno, 'WSAEACCES', errno.EACCES)):
                print("Permission to listen on port %i denied" % port)
                continue
            else:
                raise
    return None

# http://stackoverflow.com/questions/13593223/making-sure-a-python-script-with-subprocesses-dies-on-sigint