add EPOLLNVAL, annotate EPOLL... and event_poll->event

#define EPOLL_CTL_MOD 3

/* Epoll event masks */

#define EPOLLIN		0x00000001

#define EPOLLPRI	0x00000002

#define EPOLLOUT	0x00000004

#define EPOLLERR	0x00000008

#define EPOLLHUP	0x00000010

#define EPOLLRDNORM	0x00000040

#define EPOLLRDBAND	0x00000080

#define EPOLLWRNORM	0x00000100

#define EPOLLWRBAND	0x00000200

#define EPOLLMSG	0x00000400

#define EPOLLRDHUP	0x00002000

#define EPOLLIN		(__force __poll_t)0x00000001

#define EPOLLPRI	(__force __poll_t)0x00000002

#define EPOLLOUT	(__force __poll_t)0x00000004

#define EPOLLERR	(__force __poll_t)0x00000008

#define EPOLLHUP	(__force __poll_t)0x00000010

#define EPOLLNVAL	(__force __poll_t)0x00000020

#define EPOLLRDNORM	(__force __poll_t)0x00000040

#define EPOLLRDBAND	(__force __poll_t)0x00000080

#define EPOLLWRNORM	(__force __poll_t)0x00000100

#define EPOLLWRBAND	(__force __poll_t)0x00000200

#define EPOLLMSG	(__force __poll_t)0x00000400

#define EPOLLRDHUP	(__force __poll_t)0x00002000

/* Set exclusive wakeup mode for the target file descriptor */

#define EPOLLEXCLUSIVE (1U << 28)

#define EPOLLEXCLUSIVE (__force __poll_t)(1U << 28)

/*

 * Request the handling of system wakeup events so as to prevent system suspends

 *

 * Requires CAP_BLOCK_SUSPEND

 */

#define EPOLLWAKEUP (1U << 29)

#define EPOLLWAKEUP (__force __poll_t)(1U << 29)

/* Set the One Shot behaviour for the target file descriptor */

#define EPOLLONESHOT (1U << 30)

#define EPOLLONESHOT (__force __poll_t)(1U << 30)

/* Set the Edge Triggered behaviour for the target file descriptor */

#define EPOLLET (1U << 31)

#define EPOLLET (__force __poll_t)(1U << 31)

/* 

 * On x86-64 make the 64bit structure have the same alignment as the

#endif

struct epoll_event {

	__u32 events;

	__poll_t events;

	__u64 data;

} EPOLL_PACKED;