POLLIN		0x0001
POLLPRI		0x0002
POLLOUT		0x0004
POLLRDNORM	0x0040
POLLWRNORM
POLLRDBAND	0x0080
POLLWRBAND
POLLERR		0x0008
POLLHUP		0x0010
POLLNVAL	0x0020
POLLMSG
POLLREMOVE
POLLRDHUP
POLL_BUSY_LOOP	0x8000