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NAME	SIZE	ACTIONS
📁 __pycache__		[ DEL ]
📁 dummy		[ DEL ]
📄 __init__.py	916 B	[ EDIT ] \| [ DEL ]
📄 connection.py	41,398 B	[ EDIT ] \| [ DEL ]
📄 context.py	11,673 B	[ EDIT ] \| [ DEL ]
📄 forkserver.py	12,202 B	[ EDIT ] \| [ DEL ]
📄 heap.py	11,626 B	[ EDIT ] \| [ DEL ]
📄 managers.py	47,893 B	[ EDIT ] \| [ DEL ]
📄 pool.py	32,760 B	[ EDIT ] \| [ DEL ]
📄 popen_fork.py	2,377 B	[ EDIT ] \| [ DEL ]
📄 popen_forkserver.py	2,230 B	[ EDIT ] \| [ DEL ]
📄 popen_spawn_posix.py	2,029 B	[ EDIT ] \| [ DEL ]
📄 popen_spawn_win32.py	4,515 B	[ EDIT ] \| [ DEL ]
📄 process.py	12,139 B	[ EDIT ] \| [ DEL ]
📄 queues.py	12,693 B	[ EDIT ] \| [ DEL ]
📄 reduction.py	9,512 B	[ EDIT ] \| [ DEL ]
📄 resource_sharer.py	5,145 B	[ EDIT ] \| [ DEL ]
📄 resource_tracker.py	11,077 B	[ EDIT ] \| [ DEL ]
📄 shared_memory.py	18,458 B	[ EDIT ] \| [ DEL ]
📄 sharedctypes.py	6,306 B	[ EDIT ] \| [ DEL ]
📄 spawn.py	9,644 B	[ EDIT ] \| [ DEL ]
📄 synchronize.py	12,272 B	[ EDIT ] \| [ DEL ]
📄 util.py	14,261 B	[ EDIT ] \| [ DEL ]

[ CLOSE ]

EDIT: popen_fork.py

import os
import signal

from . import util

__all__ = ['Popen']

#
# Start child process using fork
#

class Popen(object):
    method = 'fork'

def __init__(self, process_obj):
        util._flush_std_streams()
        self.returncode = None
        self.finalizer = None
        self._launch(process_obj)

def duplicate_for_child(self, fd):
        return fd

def poll(self, flag=os.WNOHANG):
        if self.returncode is None:
            try:
                pid, sts = os.waitpid(self.pid, flag)
            except OSError:
                # Child process not yet created. See #1731717
                # e.errno == errno.ECHILD == 10
                return None
            if pid == self.pid:
                self.returncode = os.waitstatus_to_exitcode(sts)
        return self.returncode

def wait(self, timeout=None):
        if self.returncode is None:
            if timeout is not None:
                from multiprocessing.connection import wait
                if not wait([self.sentinel], timeout):
                    return None
            # This shouldn't block if wait() returned successfully.
            return self.poll(os.WNOHANG if timeout == 0.0 else 0)
        return self.returncode

def _send_signal(self, sig):
        if self.returncode is None:
            try:
                os.kill(self.pid, sig)
            except ProcessLookupError:
                pass
            except OSError:
                if self.wait(timeout=0.1) is None:
                    raise

def terminate(self):
        self._send_signal(signal.SIGTERM)

def kill(self):
        self._send_signal(signal.SIGKILL)

def _launch(self, process_obj):
        code = 1
        parent_r, child_w = os.pipe()
        child_r, parent_w = os.pipe()
        self.pid = os.fork()
        if self.pid == 0:
            try:
                os.close(parent_r)
                os.close(parent_w)
                code = process_obj._bootstrap(parent_sentinel=child_r)
            finally:
                os._exit(code)
        else:
            os.close(child_w)
            os.close(child_r)
            self.finalizer = util.Finalize(self, util.close_fds,
                                           (parent_r, parent_w,))
            self.sentinel = parent_r

def close(self):
        if self.finalizer is not None:
            self.finalizer()