mirror of
https://github.com/python/cpython.git
synced 2025-11-03 19:34:08 +00:00
69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
import io
|
|
import os
|
|
|
|
from . import context
|
|
from . import popen_fork
|
|
from . import reduction
|
|
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()
|
|
context.set_spawning_popen(self)
|
|
try:
|
|
reduction.dump(prep_data, fp)
|
|
reduction.dump(process_obj, fp)
|
|
finally:
|
|
context.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)
|