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File Name : 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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-12-05 10:41:22
..	dir	-	root/root	0755	2024-12-05 10:41:22
__pycache__	dir	-	root/root	0755	2024-12-05 10:41:22
dummy	dir	-	root/root	0755	2024-12-05 10:41:22
__init__.py	text/x-script.python	923 B	root/root	0644	2018-12-23 09:37:14
connection.py	text/x-script.python	30.33 KB	root/root	0644	2024-12-05 01:00:51
context.py	text/x-script.python	10.66 KB	root/root	0644	2018-12-23 09:37:14
forkserver.py	text/x-script.python	8.49 KB	root/root	0644	2018-12-23 09:37:14
heap.py	text/x-script.python	8.12 KB	root/root	0644	2018-12-23 09:37:14
managers.py	text/x-script.python	37.26 KB	root/root	0644	2018-12-23 09:37:14
pool.py	text/x-script.python	25.45 KB	root/root	0644	2018-12-23 09:37:14
popen_fork.py	text/x-script.python	2.25 KB	root/root	0644	2018-12-23 09:37:14
popen_forkserver.py	text/x-script.python	1.91 KB	root/root	0644	2018-12-23 09:37:14
popen_spawn_posix.py	text/x-script.python	1.86 KB	root/root	0644	2018-12-23 09:37:14
popen_spawn_win32.py	text/x-script.python	2.93 KB	root/root	0644	2018-12-23 09:37:14
process.py	text/x-script.python	9 KB	root/root	0644	2018-12-23 09:37:14
queues.py	text/x-script.python	10.51 KB	root/root	0644	2018-12-23 09:37:14
reduction.py	text/x-script.python	9.01 KB	root/root	0644	2018-12-23 09:37:14
resource_sharer.py	text/x-script.python	5.2 KB	root/root	0644	2018-12-23 09:37:14
semaphore_tracker.py	text/x-script.python	5.27 KB	root/root	0644	2018-12-23 09:37:14
sharedctypes.py	text/x-script.python	6.1 KB	root/root	0644	2018-12-23 09:37:14
spawn.py	text/plain	8.66 KB	root/root	0644	2018-12-23 09:37:14
synchronize.py	text/x-script.python	11.77 KB	root/root	0644	2018-12-23 09:37:14
util.py	text/x-script.python	11.61 KB	root/root	0644	2018-12-23 09:37:14

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