diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py index 79f0d63c572..30ac5924d06 100644 --- a/Lib/asyncio/base_events.py +++ b/Lib/asyncio/base_events.py @@ -56,6 +56,9 @@ _FATAL_ERROR_IGNORE = (BrokenPipeError, _HAS_IPv6 = hasattr(socket, 'AF_INET6') +# Maximum timeout passed to select to avoid OS limitations +MAXIMUM_SELECT_TIMEOUT = 24 * 3600 + def _format_handle(handle): cb = handle._callback @@ -1378,7 +1381,7 @@ class BaseEventLoop(events.AbstractEventLoop): elif self._scheduled: # Compute the desired timeout. when = self._scheduled[0]._when - timeout = max(0, when - self.time()) + timeout = min(max(0, when - self.time()), MAXIMUM_SELECT_TIMEOUT) if self._debug and timeout != 0: t0 = self.time() diff --git a/Misc/NEWS.d/next/Library/2018-07-28-17-00-36.bpo-34263.zUfRsu.rst b/Misc/NEWS.d/next/Library/2018-07-28-17-00-36.bpo-34263.zUfRsu.rst new file mode 100644 index 00000000000..799463b5916 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2018-07-28-17-00-36.bpo-34263.zUfRsu.rst @@ -0,0 +1,2 @@ +asyncio's event loop will not pass timeouts longer than one day to +epoll/select etc.