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.

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

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

Done.

New changeset d0d64ad1f5f1dc1630004091d7f8209546c1220a by Antoine Pitrou (Pierre Glaser) in branch 'master':
bpo-36368: Ignore SIGINT in SharedMemoryManager servers. (GH-12483)
https://github.com/python/cpython/commit/d0d64ad1f5f1dc1630004091d7f8209546c1220a