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try:
import socket, select, errno
select.poll # Raises AttributeError for CPython implementations without poll()
except (ImportError, AttributeError):
print("SKIP")
raise SystemExit
poller = select.poll()
s = socket.socket()
poller.register(s)
# https://docs.python.org/3/library/select.html#select.poll.register
# "Registering a file descriptor that’s already registered is not an error,
# and has the same effect as registering the descriptor exactly once."
poller.register(s)
poller.register(s, select.POLLIN | select.POLLOUT)
# 2 args are mandatory unlike register()
try:
poller.modify(s)
except TypeError:
print("modify:TypeError")
poller.modify(s, select.POLLIN)
poller.unregister(s)
try:
poller.modify(s, select.POLLIN)
except OSError as e:
assert e.errno == errno.ENOENT
# poll after closing the socket, should return POLLNVAL
poller.register(s)
s.close()
p = poller.poll(0)
print(len(p), p[0][-1])
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