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