/*
 * =====================================================================================
 *
 *       Filename:  myepoll.h
 *
 *    Description:  myepoll class definition.
 *
 *        Version:  1.0
 *        Created:  09/08/2018
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  zhulin, shzhulin3@jd.com
 *        Company:  JD.com, Inc.
 *
 * =====================================================================================
 */

#ifndef _SYS_EPOLL_H_
#define _SYS_EPOLL_H_

#if __x86_64__
#define _SYS_EPOLL_
#endif

#ifdef _SYS_EPOLL_
#include <sys/epoll.h>
#else

#include <stdint.h>
#include <sys/types.h>
#include <errno.h>
#include <sys/poll.h>
#include <asm/unistd.h>
#include <unistd.h>

/* Valid opcodes to issue to sys_epoll_ctl() */
#ifndef EPOLL_CTL_ADD
#define EPOLL_CTL_ADD 1
#endif
#ifndef EPOLL_CTL_DEL
#define EPOLL_CTL_DEL 2
#endif
#ifndef EPOLL_CTL_MOD
#define EPOLL_CTL_MOD 3
#endif

/* These are specified by iBCS2 */
#if defined(POLLIN) && !defined(EPOLLIN)
#define EPOLLIN          POLLIN
#endif
#if defined(POLLPRI) && !defined(EPOLLPRI)
#define EPOLLPRI          POLLPRI
#endif
#if defined(POLLOUT) && !defined(EPOLLOUT)
#define EPOLLOUT          POLLOUT
#endif
#if defined(POLLERR) && !defined(EPOLLERR)
#define EPOLLERR          POLLERR
#endif
#if defined(POLLHUP) && !defined(EPOLLHUP)
#define EPOLLHUP          POLLHUP
#endif
#if defined(POLLNVAL) && !defined(EPOLLNVAL)
#define EPOLLNVAL          POLLNVAL
#endif
#if defined(POLLRDNORM) && !defined(EPOLLRDNORM)
#define EPOLLRDNORM          POLLRDNORM
#endif
#if defined(POLLRDBAND) && !defined(EPOLLRDBAND)
#define EPOLLRDBAND          POLLRDBAND
#endif
#if defined(POLLWRNORM) && !defined(EPOLLWRNORM)
#define EPOLLWRNORM          POLLWRNORM
#endif
#if defined(POLLWRBAND) && !defined(EPOLLWRBAND)
#define EPOLLWRBAND          POLLWRBAND
#endif
#if defined(POLLMSG) && !defined(EPOLLMSG)
#define EPOLLMSG          POLLMSG
#endif

/* Set the One Shot behaviour for the target file descriptor */
#ifndef EPOLLONESHOT
#define EPOLLONESHOT (1 << 30)
#endif

/* Set the Edge Triggered behaviour for the target file descriptor */
#ifndef EPOLLET
#define EPOLLET (1 << 31)
#endif

/* 
 * On x86-64 make the 64bit structure have the same alignment as the
 * 32bit structure. This makes 32bit emulation easier.
 */
#ifdef __x86_64__
#define EPOLL_PACKED __attribute__((packed))
#else
#define EPOLL_PACKED
#endif

struct epoll_event {
	uint32_t events;
	union {
		void *ptr;
		int fd;
		uint32_t u32;
		uint64_t u64;
	} data;
} EPOLL_PACKED;

#ifndef __NR_epoll_create
#ifdef __x86_64__
#define __NR_epoll_create       213
#else
#define __NR_epoll_create       254
#endif
#endif
#ifndef __NR_epoll_ctl
#define __NR_epoll_ctl		(__NR_epoll_create+1)
#endif
#ifndef __NR_epoll_wait
#define __NR_epoll_wait		(__NR_epoll_create+2)
#endif

#ifdef __EPOLL_SYSCALLS__
static inline _syscall1(int, epoll_create, int, maxfds);
static inline _syscall4(int, epoll_ctl, int, epfd, int, op, int, fd, struct epoll_event *, event);
static inline _syscall4(int, epoll_wait, int, epfd, struct epoll_event *, events, int, maxevents, int, timeout);
#else
static inline int epoll_create( int maxfds) {
return syscall(__NR_epoll_create, maxfds);
}

static inline int epoll_ctl( int epfd, int op, int fd, struct epoll_event * event){
return syscall(__NR_epoll_ctl, epfd, op, fd, event);
}
static inline int epoll_wait( int epfd, struct epoll_event * events, int maxevents, int timeout){
return syscall(__NR_epoll_wait, epfd, events, maxevents, timeout);
}
#endif

#endif
#endif