does ssh-agent respond in time?

gistfile1.py

# get identities
_ssh_agent_msg = chr(11)

def check_ssh_agent(fname):
    """ Check if ssh-agent works.
    Returns True if ssh-agent got response from ssh-agent """
    conn = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    conn.connect(fname)
    conn.settimeout(10)

    try:
        conn.send(struct.pack('>I', len(_ssh_agent_msg)) + _ssh_agent_msg)
        ret = struct.unpack('>I', conn.recv(4))[0]
        # ignoring output, do not care about.
        conn.recv(ret)
        conn.close()
        return True
    except socket.timeout:
        return False