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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
dummy	[ DIR ]	drwxr-xr-x
__init__.py	923 B	-rw-r--r--
connection.py	30.33 KB	-rw-r--r--
context.py	10.66 KB	-rw-r--r--
forkserver.py	8.49 KB	-rw-r--r--
heap.py	8.12 KB	-rw-r--r--
managers.py	37.26 KB	-rw-r--r--
pool.py	25.45 KB	-rw-r--r--
popen_fork.py	2.25 KB	-rw-r--r--
popen_forkserver.py	1.91 KB	-rw-r--r--
popen_spawn_posix.py	1.86 KB	-rw-r--r--
popen_spawn_win32.py	2.93 KB	-rw-r--r--
process.py	9 KB	-rw-r--r--
queues.py	10.51 KB	-rw-r--r--
reduction.py	9.01 KB	-rw-r--r--
resource_sharer.py	5.2 KB	-rw-r--r--
semaphore_tracker.py	5.27 KB	-rw-r--r--
sharedctypes.py	6.1 KB	-rw-r--r--
spawn.py	8.66 KB	-rw-r--r--
synchronize.py	11.77 KB	-rw-r--r--
util.py	11.61 KB	-rw-r--r--

Code Editor : popen_fork.py

import os
import sys
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._launch(process_obj)

def duplicate_for_child(self, fd):
        return fd

def poll(self, flag=os.WNOHANG):
        if self.returncode is None:
            while True:
                try:
                    pid, sts = os.waitpid(self.pid, flag)
                except OSError as e:
                    # Child process not yet created. See #1731717
                    # e.errno == errno.ECHILD == 10
                    return None
                else:
                    break
            if pid == self.pid:
                if os.WIFSIGNALED(sts):
                    self.returncode = -os.WTERMSIG(sts)
                else:
                    assert os.WIFEXITED(sts)
                    self.returncode = os.WEXITSTATUS(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 terminate(self):
        if self.returncode is None:
            try:
                os.kill(self.pid, signal.SIGTERM)
            except ProcessLookupError:
                pass
            except OSError:
                if self.wait(timeout=0.1) is None:
                    raise

def _launch(self, process_obj):
        code = 1
        parent_r, child_w = os.pipe()
        self.pid = os.fork()
        if self.pid == 0:
            try:
                os.close(parent_r)
                if 'random' in sys.modules:
                    import random
                    random.seed()
                code = process_obj._bootstrap()
            finally:
                os._exit(code)
        else:
            os.close(child_w)
            util.Finalize(self, os.close, (parent_r,))
            self.sentinel = parent_r

${this.title}

Code Editor : popen_fork.py