Apply fixes, remove duplicates.

Apply fixes to _random, cStringIO, errno, operator, sys, zlib, etc.; also,
remove duplicate 2.7/math.pyi, 2.7/marshal.pyi.

builtins/2.7/signal.pyi

@@ -1,60 +1,66 @@
 from typing import Callable, Any, Tuple, Union
 
-SIG_DFL = 0
-SIG_IGN = 0
+SIG_DFL = ...  # type: long
+SIG_IGN = ...  # type: long
+ITIMER_REAL = ...  # type: long
+ITIMER_VIRTUAL = ...  # type: long
+ITIMER_PROF = ...  # type: long
 
-SIGABRT = 0
-SIGALRM = 0
-SIGBUS = 0
-SIGCHLD = 0
-SIGCLD = 0
-SIGCONT = 0
-SIGFPE = 0
-SIGHUP = 0
-SIGILL = 0
-SIGINT = 0
-SIGIO = 0
-SIGIOT = 0
-SIGKILL = 0
-SIGPIPE = 0
-SIGPOLL = 0
-SIGPROF = 0
-SIGPWR = 0
-SIGQUIT = 0
-SIGRTMAX = 0
-SIGRTMIN = 0
-SIGSEGV = 0
-SIGSTOP = 0
-SIGSYS = 0
-SIGTERM = 0
-SIGTRAP = 0
-SIGTSTP = 0
-SIGTTIN = 0
-SIGTTOU = 0
-SIGURG = 0
-SIGUSR1 = 0
-SIGUSR2 = 0
-SIGVTALRM = 0
-SIGWINCH = 0
-SIGXCPU = 0
-SIGXFSZ = 0
+SIGABRT = ...  # type: int
+SIGALRM = ...  # type: int
+SIGBUS = ...  # type: int
+SIGCHLD = ...  # type: int
+SIGCLD = ...  # type: int
+SIGCONT = ...  # type: int
+SIGFPE = ...  # type: int
+SIGHUP = ...  # type: int
+SIGILL = ...  # type: int
+SIGINT = ...  # type: int
+SIGIO = ...  # type: int
+SIGIOT = ...  # type: int
+SIGKILL = ...  # type: int
+SIGPIPE = ...  # type: int
+SIGPOLL = ...  # type: int
+SIGPROF = ...  # type: int
+SIGPWR = ...  # type: int
+SIGQUIT = ...  # type: int
+SIGRTMAX = ...  # type: int
+SIGRTMIN = ...  # type: int
+SIGSEGV = ...  # type: int
+SIGSTOP = ...  # type: int
+SIGSYS = ...  # type: int
+SIGTERM = ...  # type: int
+SIGTRAP = ...  # type: int
+SIGTSTP = ...  # type: int
+SIGTTIN = ...  # type: int
+SIGTTOU = ...  # type: int
+SIGURG = ...  # type: int
+SIGUSR1 = ...  # type: int
+SIGUSR2 = ...  # type: int
+SIGVTALRM = ...  # type: int
+SIGWINCH = ...  # type: int
+SIGXCPU = ...  # type: int
+SIGXFSZ = ...  # type: int
+NSIG = ...  # type: int
 
+# Python 3 only:
 CTRL_C_EVENT = 0
 CTRL_BREAK_EVENT = 0
 GSIG = 0
-ITIMER_REAL = 0
-ITIMER_VIRTUAL = 0
-ITIMER_PROF = 0
 
 class ItimerError(IOError): ...
 
 _HANDLER = Union[Callable[[int, Any], Any], int, None]
 
-def alarm(time: float) -> int: ...
+def alarm(time: int) -> int: ...
 def getsignal(signalnum: int) -> _HANDLER: ...
 def pause() -> None: ...
 def setitimer(which: int, seconds: float, interval: float = None) -> Tuple[float, float]: ...
 def getitimer(which: int) -> Tuple[float, float]: ...
-def set_wakeup_fd(fd: int) -> None: ...
-def siginterrupt(signalnum: int, flag: bool) -> None: ...
-def signal(signalnum: int, handler: _HANDLER) -> None: ...
+def set_wakeup_fd(fd: int) -> long: ...
+def siginterrupt(signalnum: int, flag: bool) -> None:
+    raise RuntimeError()
+def signal(signalnum: int, handler: _HANDLER) -> None:
+    raise RuntimeError()
+def default_int_handler(*args, **kwargs) -> Any:
+    raise KeyboardInterrupt()