/usr/lib/python3.7/multiprocessing/popen_spawn_win32.py is in libpython3.7-stdlib 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | import os
import msvcrt
import signal
import sys
import _winapi
from .context import reduction, get_spawning_popen, set_spawning_popen
from . import spawn
from . import util
__all__ = ['Popen']
#
#
#
TERMINATE = 0x10000
WINEXE = (sys.platform == 'win32' and getattr(sys, 'frozen', False))
WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")
#
# We define a Popen class similar to the one from subprocess, but
# whose constructor takes a process object as its argument.
#
class Popen(object):
'''
Start a subprocess to run the code of a process object
'''
method = 'spawn'
def __init__(self, process_obj):
prep_data = spawn.get_preparation_data(process_obj._name)
# read end of pipe will be "stolen" by the child process
# -- see spawn_main() in spawn.py.
rhandle, whandle = _winapi.CreatePipe(None, 0)
wfd = msvcrt.open_osfhandle(whandle, 0)
cmd = spawn.get_command_line(parent_pid=os.getpid(),
pipe_handle=rhandle)
cmd = ' '.join('"%s"' % x for x in cmd)
with open(wfd, 'wb', closefd=True) as to_child:
# start process
try:
hp, ht, pid, tid = _winapi.CreateProcess(
spawn.get_executable(), cmd,
None, None, False, 0, None, None, None)
_winapi.CloseHandle(ht)
except:
_winapi.CloseHandle(rhandle)
raise
# set attributes of self
self.pid = pid
self.returncode = None
self._handle = hp
self.sentinel = int(hp)
self.finalizer = util.Finalize(self, _winapi.CloseHandle, (self.sentinel,))
# send information to child
set_spawning_popen(self)
try:
reduction.dump(prep_data, to_child)
reduction.dump(process_obj, to_child)
finally:
set_spawning_popen(None)
def duplicate_for_child(self, handle):
assert self is get_spawning_popen()
return reduction.duplicate(handle, self.sentinel)
def wait(self, timeout=None):
if self.returncode is None:
if timeout is None:
msecs = _winapi.INFINITE
else:
msecs = max(0, int(timeout * 1000 + 0.5))
res = _winapi.WaitForSingleObject(int(self._handle), msecs)
if res == _winapi.WAIT_OBJECT_0:
code = _winapi.GetExitCodeProcess(self._handle)
if code == TERMINATE:
code = -signal.SIGTERM
self.returncode = code
return self.returncode
def poll(self):
return self.wait(timeout=0)
def terminate(self):
if self.returncode is None:
try:
_winapi.TerminateProcess(int(self._handle), TERMINATE)
except OSError:
if self.wait(timeout=1.0) is None:
raise
kill = terminate
def close(self):
self.finalizer()
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