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NAME	SIZE	ACTIONS
📁 __pycache__		[ DEL ]
📁 dummy		[ DEL ]
📄 __init__.py	923 B	[ EDIT ] \| [ DEL ]
📄 connection.py	31,062 B	[ EDIT ] \| [ DEL ]
📄 context.py	10,917 B	[ EDIT ] \| [ DEL ]
📄 forkserver.py	8,694 B	[ EDIT ] \| [ DEL ]
📄 heap.py	8,319 B	[ EDIT ] \| [ DEL ]
📄 managers.py	38,151 B	[ EDIT ] \| [ DEL ]
📄 pool.py	26,059 B	[ EDIT ] \| [ DEL ]
📄 popen_fork.py	2,307 B	[ EDIT ] \| [ DEL ]
📄 popen_forkserver.py	1,956 B	[ EDIT ] \| [ DEL ]
📄 popen_spawn_posix.py	1,904 B	[ EDIT ] \| [ DEL ]
📄 popen_spawn_win32.py	2,999 B	[ EDIT ] \| [ DEL ]
📄 process.py	9,211 B	[ EDIT ] \| [ DEL ]
📄 queues.py	10,763 B	[ EDIT ] \| [ DEL ]
📄 reduction.py	9,226 B	[ EDIT ] \| [ DEL ]
📄 resource_sharer.py	5,325 B	[ EDIT ] \| [ DEL ]
📄 semaphore_tracker.py	5,394 B	[ EDIT ] \| [ DEL ]
📄 sharedctypes.py	6,245 B	[ EDIT ] \| [ DEL ]
📄 spawn.py	8,863 B	[ EDIT ] \| [ DEL ]
📄 synchronize.py	12,050 B	[ EDIT ] \| [ DEL ]
📄 util.py	11,886 B	[ EDIT ] \| [ DEL ]

[ CLOSE ]

EDIT: popen_spawn_posix.py

import io
import os

from .context import reduction, set_spawning_popen
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, fd):
        self.fd = fd
    def detach(self):
        return self.fd

#
# Start child process using a fresh interpreter
#

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

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

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

def _launch(self, process_obj):
        from . import semaphore_tracker
        tracker_fd = semaphore_tracker.getfd()
        self._fds.append(tracker_fd)
        prep_data = spawn.get_preparation_data(process_obj._name)
        fp = io.BytesIO()
        set_spawning_popen(self)
        try:
            reduction.dump(prep_data, fp)
            reduction.dump(process_obj, fp)
        finally:
            set_spawning_popen(None)

parent_r = child_w = child_r = parent_w = None
        try:
            parent_r, child_w = os.pipe()
            child_r, parent_w = os.pipe()
            cmd = spawn.get_command_line(tracker_fd=tracker_fd,
                                         pipe_handle=child_r)
            self._fds.extend([child_r, child_w])
            self.pid = util.spawnv_passfds(spawn.get_executable(),
                                           cmd, self._fds)
            self.sentinel = parent_r
            with open(parent_w, 'wb', closefd=False) as f:
                f.write(fp.getbuffer())
        finally:
            if parent_r is not None:
                util.Finalize(self, os.close, (parent_r,))
            for fd in (child_r, child_w, parent_w):
                if fd is not None:
                    os.close(fd)