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[3.6] bpo-34263 Cap timeout submitted to epoll/select etc. to one day. (GH-8532) #8587

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Merged
merged 2 commits into from
Jul 31, 2018
Merged

[3.6] bpo-34263 Cap timeout submitted to epoll/select etc. to one day. (GH-8532) #8587

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bpo-34263 Cap timeout submitted to epoll/select etc. to one day. (GH-…
MartinAltmayer Jul 31, 2018
b1ae8ae
Update asyncio-eventloop.rst
1st1 Jul 31, 2018
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5 changes: 4 additions & 1 deletion Lib/asyncio/base_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,9 @@

_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
Expand Down Expand Up @@ -1378,7 +1381,7 @@ def _run_once(self):
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()
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2018-07-28-17-00-36.bpo-34263.zUfRsu.rst
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@@ -0,0 +1,2 @@
asyncio's event loop will not pass timeouts longer than one day to
epoll/select etc.