You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
4.0 KiB
Python
117 lines
4.0 KiB
Python
# Copyright (c) IPython Development Team.
|
|
# Distributed under the terms of the Modified BSD License.
|
|
|
|
try:
|
|
import ctypes
|
|
except ImportError:
|
|
ctypes = None # type:ignore[assignment]
|
|
import os
|
|
import platform
|
|
import signal
|
|
import time
|
|
import warnings
|
|
from _thread import interrupt_main # Py 3
|
|
from threading import Thread
|
|
|
|
from traitlets.log import get_logger
|
|
|
|
|
|
class ParentPollerUnix(Thread):
|
|
"""A Unix-specific daemon thread that terminates the program immediately
|
|
when the parent process no longer exists.
|
|
"""
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
self.daemon = True
|
|
|
|
def run(self):
|
|
# We cannot use os.waitpid because it works only for child processes.
|
|
from errno import EINTR
|
|
|
|
while True:
|
|
try:
|
|
if os.getppid() == 1:
|
|
get_logger().warning("Parent appears to have exited, shutting down.")
|
|
os._exit(1)
|
|
time.sleep(1.0)
|
|
except OSError as e:
|
|
if e.errno == EINTR:
|
|
continue
|
|
raise
|
|
|
|
|
|
class ParentPollerWindows(Thread):
|
|
"""A Windows-specific daemon thread that listens for a special event that
|
|
signals an interrupt and, optionally, terminates the program immediately
|
|
when the parent process no longer exists.
|
|
"""
|
|
|
|
def __init__(self, interrupt_handle=None, parent_handle=None):
|
|
"""Create the poller. At least one of the optional parameters must be
|
|
provided.
|
|
|
|
Parameters
|
|
----------
|
|
interrupt_handle : HANDLE (int), optional
|
|
If provided, the program will generate a Ctrl+C event when this
|
|
handle is signaled.
|
|
parent_handle : HANDLE (int), optional
|
|
If provided, the program will terminate immediately when this
|
|
handle is signaled.
|
|
"""
|
|
assert interrupt_handle or parent_handle
|
|
super().__init__()
|
|
if ctypes is None:
|
|
raise ImportError("ParentPollerWindows requires ctypes")
|
|
self.daemon = True
|
|
self.interrupt_handle = interrupt_handle
|
|
self.parent_handle = parent_handle
|
|
|
|
def run(self):
|
|
"""Run the poll loop. This method never returns."""
|
|
try:
|
|
from _winapi import INFINITE, WAIT_OBJECT_0 # type:ignore[attr-defined]
|
|
except ImportError:
|
|
from _subprocess import INFINITE, WAIT_OBJECT_0
|
|
|
|
# Build the list of handle to listen on.
|
|
handles = []
|
|
if self.interrupt_handle:
|
|
handles.append(self.interrupt_handle)
|
|
if self.parent_handle:
|
|
handles.append(self.parent_handle)
|
|
arch = platform.architecture()[0]
|
|
c_int = ctypes.c_int64 if arch.startswith("64") else ctypes.c_int
|
|
|
|
# Listen forever.
|
|
while True:
|
|
result = ctypes.windll.kernel32.WaitForMultipleObjects( # type:ignore[attr-defined]
|
|
len(handles), # nCount
|
|
(c_int * len(handles))(*handles), # lpHandles
|
|
False, # bWaitAll
|
|
INFINITE,
|
|
) # dwMilliseconds
|
|
|
|
if WAIT_OBJECT_0 <= result < len(handles):
|
|
handle = handles[result - WAIT_OBJECT_0]
|
|
|
|
if handle == self.interrupt_handle:
|
|
# check if signal handler is callable
|
|
# to avoid 'int not callable' error (Python issue #23395)
|
|
if callable(signal.getsignal(signal.SIGINT)):
|
|
interrupt_main()
|
|
|
|
elif handle == self.parent_handle:
|
|
get_logger().warning("Parent appears to have exited, shutting down.")
|
|
os._exit(1)
|
|
elif result < 0:
|
|
# wait failed, just give up and stop polling.
|
|
warnings.warn(
|
|
"""Parent poll failed. If the frontend dies,
|
|
the kernel may be left running. Please let us know
|
|
about your system (bitness, Python, etc.) at
|
|
ipython-dev@scipy.org"""
|
|
)
|
|
return
|