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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Directory :  /usr/lib64/python3.6/multiprocessing/

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Current File : //usr/lib64/python3.6/multiprocessing/popen_forkserver.py
import io
import os

from .context import reduction, set_spawning_popen
if not reduction.HAVE_SEND_HANDLE:
    raise ImportError('No support for sending fds between processes')
from . import forkserver
from . import popen_fork
from . import spawn
from . import util


__all__ = ['Popen']

#
# Wrapper for an fd used while launching a process
#

class _DupFd(object):
    def __init__(self, ind):
        self.ind = ind
    def detach(self):
        return forkserver.get_inherited_fds()[self.ind]

#
# Start child process using a server process
#

class Popen(popen_fork.Popen):
    method = 'forkserver'
    DupFd = _DupFd

    def __init__(self, process_obj):
        self._fds = []
        super().__init__(process_obj)

    def duplicate_for_child(self, fd):
        self._fds.append(fd)
        return len(self._fds) - 1

    def _launch(self, process_obj):
        prep_data = spawn.get_preparation_data(process_obj._name)
        buf = io.BytesIO()
        set_spawning_popen(self)
        try:
            reduction.dump(prep_data, buf)
            reduction.dump(process_obj, buf)
        finally:
            set_spawning_popen(None)

        self.sentinel, w = forkserver.connect_to_new_process(self._fds)
        util.Finalize(self, os.close, (self.sentinel,))
        with open(w, 'wb', closefd=True) as f:
            f.write(buf.getbuffer())
        self.pid = forkserver.read_unsigned(self.sentinel)

    def poll(self, flag=os.WNOHANG):
        if self.returncode is None:
            from multiprocessing.connection import wait
            timeout = 0 if flag == os.WNOHANG else None
            if not wait([self.sentinel], timeout):
                return None
            try:
                self.returncode = forkserver.read_unsigned(self.sentinel)
            except (OSError, EOFError):
                # The process ended abnormally perhaps because of a signal
                self.returncode = 255
        return self.returncode

haha - 2025