晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //lib64/python3.6/site-packages/systemd/daemon.py
from socket import AF_UNSPEC as _AF_UNSPEC

from ._daemon import (__version__,
                      booted,
                      notify,
                      _listen_fds,
                      _is_fifo,
                      _is_socket,
                      _is_socket_inet,
                      _is_socket_sockaddr,
                      _is_socket_unix,
                      _is_mq,
                      LISTEN_FDS_START)

def _convert_fileobj(fileobj):
    try:
        return fileobj.fileno()
    except AttributeError:
        return fileobj

def is_fifo(fileobj, path=None):
    fd = _convert_fileobj(fileobj)
    return _is_fifo(fd, path)

def is_socket(fileobj, family=_AF_UNSPEC, type=0, listening=-1):
    fd = _convert_fileobj(fileobj)
    return _is_socket(fd, family, type, listening)

def is_socket_inet(fileobj, family=_AF_UNSPEC, type=0, listening=-1, port=0):
    fd = _convert_fileobj(fileobj)
    return _is_socket_inet(fd, family, type, listening, port)

def is_socket_sockaddr(fileobj, address, type=0, flowinfo=0, listening=-1):
    """Check socket type, address and/or port, flowinfo, listening state.

    Wraps sd_is_socket_inet_sockaddr(3).

    `address` is a systemd-style numerical IPv4 or IPv6 address as used in
    ListenStream=. A port may be included after a colon (":").
    See systemd.socket(5) for details.

    Constants for `family` are defined in the socket module.
    """
    fd = _convert_fileobj(fileobj)
    return _is_socket_sockaddr(fd, address, type, flowinfo, listening)

def is_socket_unix(fileobj, type=0, listening=-1, path=None):
    fd = _convert_fileobj(fileobj)
    return _is_socket_unix(fd, type, listening, path)

def is_mq(fileobj, path=None):
    fd = _convert_fileobj(fileobj)
    return _is_mq(fd, path)

def listen_fds(unset_environment=True):
    """Return a list of socket activated descriptors

    Example::

      (in primary window)
      $ systemd-activate -l 2000 python3 -c \\
          'from systemd.daemon import listen_fds; print(listen_fds())'
      (in another window)
      $ telnet localhost 2000
      (in primary window)
      ...
      Execing python3 (...)
      [3]
    """
    num = _listen_fds(unset_environment)
    return list(range(LISTEN_FDS_START, LISTEN_FDS_START + num))

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