73 lines
1.7 KiB
Python
73 lines
1.7 KiB
Python
import multiprocessing
|
|
import os
|
|
import platform
|
|
import sys
|
|
from subprocess import PIPE
|
|
from subprocess import Popen
|
|
import atexit
|
|
import traceback
|
|
import logging
|
|
import signal
|
|
|
|
CREATE_NEW_PROCESS_GROUP = 0x00000200
|
|
DETACHED_PROCESS = 0x00000008
|
|
|
|
REGISTERED = []
|
|
|
|
|
|
def start_detached(executable, *args):
|
|
"""
|
|
Starts a fully independent subprocess (with no parent)
|
|
:param executable: executable
|
|
:param args: arguments to the executable, eg: ['--param1_key=param1_val', '-vvv' ...]
|
|
:return: pid of the grandchild process
|
|
"""
|
|
|
|
# create pipe
|
|
reader, writer = multiprocessing.Pipe(False)
|
|
|
|
# do not keep reference
|
|
multiprocessing.Process(target=_start_detached, args=(executable, *args), kwargs={'writer': writer},
|
|
daemon=True).start()
|
|
# receive pid from pipe
|
|
pid = reader.recv()
|
|
REGISTERED.append(pid)
|
|
# close pipes
|
|
writer.close()
|
|
reader.close()
|
|
|
|
return pid
|
|
|
|
|
|
def _start_detached(executable, *args, writer: multiprocessing.Pipe = None):
|
|
|
|
# configure launch
|
|
kwargs = {}
|
|
if platform.system() == 'Windows':
|
|
kwargs.update(creationflags=DETACHED_PROCESS | CREATE_NEW_PROCESS_GROUP)
|
|
elif sys.version_info < (3, 2):
|
|
# assume posix
|
|
kwargs.update(preexec_fn=os.setsid)
|
|
else: # Python 3.2+ and Unix
|
|
kwargs.update(start_new_session=True)
|
|
|
|
# run
|
|
p = Popen([executable, *args], stdin=PIPE, stdout=PIPE, stderr=PIPE, **kwargs)
|
|
|
|
# send pid to pipe
|
|
writer.send(p.pid)
|
|
sys.exit()
|
|
|
|
|
|
def _cleanup():
|
|
for pid in REGISTERED:
|
|
try:
|
|
logging.getLogger(__name__).debug('cleaning up pid %d ' % pid)
|
|
os.kill(pid, signal.SIGTERM)
|
|
except: # noqa
|
|
pass
|
|
|
|
|
|
atexit.register(_cleanup)
|
|
|