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Restore OS-level signal handler after changing it in plt.pause() #29947

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Restore OS-level signal handler after changing it in plt.pause() #29947

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11 changes: 11 additions & 0 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@
import time
import weakref
from weakref import WeakKeyDictionary
from ctypes import c_int, c_void_p, pythonapi

import numpy as np

Expand All @@ -59,6 +60,11 @@
from matplotlib._enums import JoinStyle, CapStyle


pythonapi.PyOS_getsig.restype = c_void_p
pythonapi.PyOS_getsig.argtypes = (c_int,)
pythonapi.PyOS_setsig.restype = c_void_p
pythonapi.PyOS_setsig.argtypes = (c_int, c_void_p)

_log = logging.getLogger(__name__)
_default_filetypes = {
'eps': 'Encapsulated Postscript',
Expand Down Expand Up @@ -1655,6 +1661,10 @@ def _allow_interrupt(prepare_notifier, handle_sigint):
old_wakeup_fd = signal.set_wakeup_fd(wsock.fileno())
notifier = prepare_notifier(rsock)

# Save OS level sigint handlers
# See https://github.com/prompt-toolkit/python-prompt-toolkit/issues/1576
sigint_os = pythonapi.PyOS_getsig(signal.SIGINT)

def save_args_and_handle_sigint(*args):
nonlocal handler_args
handler_args = args
Expand All @@ -1668,6 +1678,7 @@ def save_args_and_handle_sigint(*args):
rsock.close()
signal.set_wakeup_fd(old_wakeup_fd)
signal.signal(signal.SIGINT, old_sigint_handler)
pythonapi.PyOS_setsig(signal.SIGINT, sigint_os)
if handler_args is not None:
old_sigint_handler(*handler_args)

Expand Down
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