from types import FrameType
from typing import Callable, Union

SIG_DFL: int
SIG_IGN: int

ITIMER_REAL: int
ITIMER_VIRTUAL: int
ITIMER_PROF: int

NSIG: int

SIGABRT: int
SIGALRM: int
SIGBREAK: int  # Windows
SIGBUS: int
SIGCHLD: int
SIGCLD: int
SIGCONT: int
SIGEMT: int
SIGFPE: int
SIGHUP: int
SIGILL: int
SIGINFO: int
SIGINT: int
SIGIO: int
SIGIOT: int
SIGKILL: int
SIGPIPE: int
SIGPOLL: int
SIGPROF: int
SIGPWR: int
SIGQUIT: int
SIGRTMAX: int
SIGRTMIN: int
SIGSEGV: int
SIGSTOP: int
SIGSYS: int
SIGTERM: int
SIGTRAP: int
SIGTSTP: int
SIGTTIN: int
SIGTTOU: int
SIGURG: int
SIGUSR1: int
SIGUSR2: int
SIGVTALRM: int
SIGWINCH: int
SIGXCPU: int
SIGXFSZ: int

# Windows
CTRL_C_EVENT: int
CTRL_BREAK_EVENT: int

class ItimerError(IOError): ...

_HANDLER = Union[Callable[[int, FrameType], None], int, None]

def alarm(time: int) -> int: ...
def getsignal(signalnum: int) -> _HANDLER: ...
def pause() -> None: ...
def setitimer(which: int, seconds: float, interval: float = ...) -> tuple[float, float]: ...
def getitimer(which: int) -> tuple[float, float]: ...
def set_wakeup_fd(fd: int) -> int: ...
def siginterrupt(signalnum: int, flag: bool) -> None: ...
def signal(signalnum: int, handler: _HANDLER) -> _HANDLER: ...
def default_int_handler(signum: int, frame: FrameType) -> None: ...