Method _get_process_creation_time

src/filelock/_soft.py:107–133

Return the process creation FILETIME as an integer on Windows, ``None`` otherwise.

(pid: int)

    @staticmethod
    def _get_process_creation_time(pid: int) -> int | None:
        """Return the process creation FILETIME as an integer on Windows, ``None`` otherwise."""
        if sys.platform != "win32":  # pragma: win32 no cover
            return None
        import ctypes  # pragma: win32 cover  # noqa: PLC0415
        from ctypes import wintypes  # noqa: PLC0415

        kernel32 = ctypes.windll.kernel32
        handle = kernel32.OpenProcess(_WIN_PROCESS_QUERY_LIMITED_INFORMATION, 0, pid)
        if not handle:
            return None
        try:
            creation = wintypes.FILETIME()
            exit_time = wintypes.FILETIME()
            kernel_time = wintypes.FILETIME()
            user_time = wintypes.FILETIME()
            if not kernel32.GetProcessTimes(
                handle,
                ctypes.byref(creation),
                ctypes.byref(exit_time),
                ctypes.byref(kernel_time),
                ctypes.byref(user_time),
            ):
                return None
        finally:
            kernel32.CloseHandle(handle)
        return (creation.dwHighDateTime << 32) | creation.dwLowDateTime

    @staticmethod
    def _write_lock_info(fd: int) -> None: