proc default_int_handler(signalnum: PySignal; frame: PFrame) {.
    ...raises: [KeyboardInterrupt], tags: [], forbids: [].}

proc set_wakeup_signal(signalnum: PySignal): int {....raises: [], tags: [],
    forbids: [].}

proc signal(signalnum: PySignal; handler: CSigHandler | NimSigHandler | Handlers): PySigHandler {.
    discardable.}

proc signal(signalnum: PySignal; handler: PySigHandler): PySigHandler {.
    discardable, ...raises: [ValueError, PyOSError], tags: [], forbids: [].}