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- """Use a Windows event to interrupt a child process like SIGINT.
- The child needs to explicitly listen for this - see
- ipykernel.parentpoller.ParentPollerWindows for a Python implementation.
- """
- import ctypes
- from typing import Any
- def create_interrupt_event() -> Any:
- """Create an interrupt event handle.
- The parent process should call this to create the
- interrupt event that is passed to the child process. It should store
- this handle and use it with ``send_interrupt`` to interrupt the child
- process.
- """
- # Create a security attributes struct that permits inheritance of the
- # handle by new processes.
- # FIXME: We can clean up this mess by requiring pywin32 for IPython.
- class SECURITY_ATTRIBUTES(ctypes.Structure): # noqa
- _fields_ = [
- ("nLength", ctypes.c_int),
- ("lpSecurityDescriptor", ctypes.c_void_p),
- ("bInheritHandle", ctypes.c_int),
- ]
- sa = SECURITY_ATTRIBUTES()
- sa_p = ctypes.pointer(sa)
- sa.nLength = ctypes.sizeof(SECURITY_ATTRIBUTES)
- sa.lpSecurityDescriptor = 0
- sa.bInheritHandle = 1
- return ctypes.windll.kernel32.CreateEventA( # type:ignore[attr-defined]
- sa_p,
- False,
- False,
- "", # lpEventAttributes # bManualReset # bInitialState
- ) # lpName
- def send_interrupt(interrupt_handle: Any) -> None:
- """Sends an interrupt event using the specified handle."""
- ctypes.windll.kernel32.SetEvent(interrupt_handle) # type:ignore[attr-defined]
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