[issue17919] AIX POLLNVAL definition causes problems

[STINNER Victor]

STINNER Victor added the comment:

With  poll_events_mask_overflow.patch, the following hack can maybe be removed?

            /* The &0xffff is a workaround for AIX.  'revents'
               is a 16-bit short, and IBM assigned POLLNVAL
               to be 0x8000, so the conversion to int results
               in a negative number. See SF bug #923315. */
            num = PyLong_FromLong(self->ufds[i].revents & 0xffff);

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<http://bugs.python.org/issue17919>
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