server process of shared_memory shuts down if KeyboardInterrupt

[pierreglaser]

BPO	36368
Nosy	@pitrou, @applio, @pierreglaser
PRs	bpo-36368: Ignore SIGINT in SharedMemoryManager servers. #12483
Files	0001-FIX-protect-shared_memory-server-from-SIGINT.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-05-18.12:38:22.883>
created_at = <Date 2019-03-19.16:38:01.480>
labels = ['3.8', 'type-crash']
title = 'server process of shared_memory shuts down if KeyboardInterrupt'
updated_at = <Date 2019-05-18.12:38:22.883>
user = 'https://github.com/pierreglaser'

bugs.python.org fields:

activity = <Date 2019-05-18.12:38:22.883>
actor = 'pierreglaser'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-18.12:38:22.883>
closer = 'pierreglaser'
components = []
creation = <Date 2019-03-19.16:38:01.480>
creator = 'pierreglaser'
dependencies = []
files = ['48222']
hgrepos = []
issue_num = 36368
keywords = ['patch']
message_count = 5.0
messages = ['338380', '338488', '338489', '338548', '342117']
nosy_count = 3.0
nosy_names = ['pitrou', 'davin', 'pierreglaser']
pr_nums = ['12483']
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue36368'
versions = ['Python 3.8']

[pierreglaser]

When starting a SharedMemoryManager in an interactive session, any KeyboardInterrupt event will be transmitted to the (sub)process running the shared memory server, which causes the Manager to be unusable thereafter:

>>> from multiprocessing.managers import SharedMemoryManager
>>> smm = SharedMemoryManager()
>>> smm.start()
>>> start typing something wrong
KeyboardInterrupt
>>> sl = smm.ShareableList(range(10))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pierreglaser/repos/cpython/Lib/multiprocessing/managers.py", line 1342, in ShareableList
    with self._Client(self._address, authkey=self._authkey) as conn:
  File "/home/pierreglaser/repos/cpython/Lib/multiprocessing/connection.py", line 502, in Client
    c = SocketClient(address)
  File "/home/pierreglaser/repos/cpython/Lib/multiprocessing/connection.py", line 629, in SocketClient
    s.connect(address)
FileNotFoundError: [Errno 2] No such file or directory

I suggest ignoring SIGINT in the server process.

[pitrou]

Your patch sounds good on the principle, but can you make a patch out of it?

[pitrou]

Sorry - I meant make a *PR* out of it :-)

[pierreglaser]

Done.

[pitrou]

New changeset d0d64ad by Antoine Pitrou (Pierre Glaser) in branch 'master':
bpo-36368: Ignore SIGINT in SharedMemoryManager servers. (GH-12483)
d0d64ad