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from __future__ import annotations
import signal
from collections.abc import Callable
from types import FrameType
from typing import Any, Optional, Union
# copy of _HANDLER from typeshed/stdlib/signal.pyi
SignalHandlerT = Union[
Callable[[int, Optional[FrameType]], Any], int, signal.Handlers, None
]
signal_names: dict[int, str] = {}
for signame in dir(signal):
if signame.startswith("SIG") and not signame.startswith("SIG_"):
signum = getattr(signal, signame)
if isinstance(signum, int):
signal_names[signum] = signame
def install_shutdown_handlers(
function: SignalHandlerT, override_sigint: bool = True
) -> None:
"""Install the given function as a signal handler for all common shutdown
signals (such as SIGINT, SIGTERM, etc). If ``override_sigint`` is ``False`` the
SIGINT handler won't be installed if there is already a handler in place
(e.g. Pdb)
"""
signal.signal(signal.SIGTERM, function)
if (
signal.getsignal(signal.SIGINT) # pylint: disable=comparison-with-callable
== signal.default_int_handler
or override_sigint
):
signal.signal(signal.SIGINT, function)
# Catch Ctrl-Break in windows
if hasattr(signal, "SIGBREAK"):
signal.signal(signal.SIGBREAK, function)
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