You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
2.0 KiB
71 lines
2.0 KiB
6 years ago
|
import io
|
||
|
|
import os
|
||
|
|
|
||
|
|
from .context import reduction, set_spawning_popen
|
||
|
|
if not reduction.HAVE_SEND_HANDLE:
|
||
|
|
raise ImportError('No support for sending fds between processes')
|
||
|
|
from . import forkserver
|
||
|
|
from . import popen_fork
|
||
|
|
from . import spawn
|
||
|
|
from . import util
|
||
|
|
|
||
|
|
|
||
|
|
__all__ = ['Popen']
|
||
|
|
|
||
|
|
#
|
||
|
|
# Wrapper for an fd used while launching a process
|
||
|
|
#
|
||
|
|
|
||
|
|
class _DupFd(object):
|
||
|
|
def __init__(self, ind):
|
||
|
|
self.ind = ind
|
||
|
|
def detach(self):
|
||
|
|
return forkserver.get_inherited_fds()[self.ind]
|
||
|
|
|
||
|
|
#
|
||
|
|
# Start child process using a server process
|
||
|
|
#
|
||
|
|
|
||
|
|
class Popen(popen_fork.Popen):
|
||
|
|
method = 'forkserver'
|
||
|
|
DupFd = _DupFd
|
||
|
|
|
||
|
|
def __init__(self, process_obj):
|
||
|
|
self._fds = []
|
||
|
|
super().__init__(process_obj)
|
||
|
|
|
||
|
|
def duplicate_for_child(self, fd):
|
||
|
|
self._fds.append(fd)
|
||
|
|
return len(self._fds) - 1
|
||
|
|
|
||
|
|
def _launch(self, process_obj):
|
||
|
|
prep_data = spawn.get_preparation_data(process_obj._name)
|
||
|
|
buf = io.BytesIO()
|
||
|
|
set_spawning_popen(self)
|
||
|
|
try:
|
||
|
|
reduction.dump(prep_data, buf)
|
||
|
|
reduction.dump(process_obj, buf)
|
||
|
|
finally:
|
||
|
|
set_spawning_popen(None)
|
||
|
|
|
||
|
|
self.sentinel, w = forkserver.connect_to_new_process(self._fds)
|
||
|
|
self.finalizer = util.Finalize(self, os.close, (self.sentinel,))
|
||
|
|
with open(w, 'wb', closefd=True) as f:
|
||
|
|
f.write(buf.getbuffer())
|
||
|
|
self.pid = forkserver.read_signed(self.sentinel)
|
||
|
|
|
||
|
|
def poll(self, flag=os.WNOHANG):
|
||
|
|
if self.returncode is None:
|
||
|
|
from multiprocessing.connection import wait
|
||
|
|
timeout = 0 if flag == os.WNOHANG else None
|
||
|
|
if not wait([self.sentinel], timeout):
|
||
|
|
return None
|
||
|
|
try:
|
||
|
|
self.returncode = forkserver.read_signed(self.sentinel)
|
||
|
|
except (OSError, EOFError):
|
||
|
|
# This should not happen usually, but perhaps the forkserver
|
||
|
|
# process itself got killed
|
||
|
|
self.returncode = 255
|
||
|
|
|
||
|
|
return self.returncode
|