/usr/lib/python3/dist-packages/ipykernel/parentpoller.py is in python3-ipykernel 4.8.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | # Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
try:
import ctypes
except:
ctypes = None
import os
import platform
import signal
import time
try:
from _thread import interrupt_main # Py 3
except ImportError:
from thread import interrupt_main # Py 2
from threading import Thread
from traitlets.log import get_logger
import warnings
class ParentPollerUnix(Thread):
""" A Unix-specific daemon thread that terminates the program immediately
when the parent process no longer exists.
"""
def __init__(self):
super(ParentPollerUnix, self).__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(ParentPollerWindows, self).__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 WAIT_OBJECT_0, INFINITE
except ImportError:
from _subprocess import WAIT_OBJECT_0, INFINITE
# 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(
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
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