[3.7] bpo-34263 Cap timeout submitted to epoll/select etc. to one day. (GH-8532) (GH-8586)
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index dc0ca3f..a79e123 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -63,6 +63,9 @@
_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
@@ -1702,7 +1705,7 @@
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()