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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	30.56 KB	-rw-r--r--
context.py	10.67 KB	-rw-r--r--
forkserver.py	12.11 KB	-rw-r--r--
heap.py	8.71 KB	-rw-r--r--
managers.py	40.02 KB	-rw-r--r--
pool.py	26.21 KB	-rw-r--r--
popen_fork.py	2.34 KB	-rw-r--r--
popen_forkserver.py	1.97 KB	-rw-r--r--
popen_spawn_posix.py	1.88 KB	-rw-r--r--
popen_spawn_win32.py	3.68 KB	-rw-r--r--
process.py	10.3 KB	-rw-r--r--
queues.py	11.32 KB	-rw-r--r--
reduction.py	9.14 KB	-rw-r--r--
resource_sharer.py	5.23 KB	-rw-r--r--
semaphore_tracker.py	5.34 KB	-rw-r--r--
sharedctypes.py	6.16 KB	-rw-r--r--
spawn.py	8.64 KB	-rw-r--r--
synchronize.py	11.31 KB	-rw-r--r--
util.py	13.36 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.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 as e:
                # Child process not yet created. See #1731717
                # e.errno == errno.ECHILD == 10
                return None
            if pid == self.pid:
                if os.WIFSIGNALED(sts):
                    self.returncode = -os.WTERMSIG(sts)
                else:
                    assert os.WIFEXITED(sts), "Status is {:n}".format(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 _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()
        self.pid = os.fork()
        if self.pid == 0:
            try:
                os.close(parent_r)
                code = process_obj._bootstrap()
            finally:
                os._exit(code)
        else:
            os.close(child_w)
            self.finalizer = util.Finalize(self, os.close, (parent_r,))
            self.sentinel = parent_r

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

${this.title}

Code Editor : popen_fork.py