epoll c++封装

#ifndef _BFC_EPOLL_FLOW_HPP_
#define _BFC_EPOLL_FLOW_HPP_

#include <string.h>
#include <errno.h>
#include <sys/epoll.h>
#include <assert.h>
#include <string>
#include <stdexcept>
#include <iostream>

/*
EPOLLIN ：表示对应的文件描述符可以读
EPOLLOUT：表示对应的文件描述符可以写
EPOLLPRI：表示对应的文件描述符有紧急的数据可读
EPOLLERR：表示对应的文件描述符发生错误
EPOLLHUP：表示对应的文件描述符被挂断
EPOLLET： 表示对应的文件描述符有事件发生
*/

class CEPollFlow
{
public:
CEPollFlow();
~CEPollFlow();

int Create(int iMaxFD);
//int Wait(int iTimeMs);

int Wait(int iTimeMs);
int GetEvents(long long &llKey, unsigned int &iEvent);

int Add(int iFd,long long llKey,int iFlag);
int Modify(int iFd,long long llKey,int iFlag);
int Del(int iFd);

private:
int Ctl(int iFd,long long llKey,int iEpollAction, int iFlag);

int m_iEpollFD;
epoll_event* m_pEpollEvents;
int m_iMaxFD;

int m_iEventNum;
int m_iCurrEvtIdx;
};

#endif // _BFC_EPOLL_FLOW_HPP_

#include "bfc_epoll_flow.h"

CEPollFlow::CEPollFlow()
{
m_iEpollFD = -1;
m_pEpollEvents = NULL;
}

CEPollFlow::~CEPollFlow()
{
if(m_pEpollEvents)
{
delete [] m_pEpollEvents;
}

if(m_iEpollFD >= 0)
{
close(m_iEpollFD);
}
}

int CEPollFlow::Create(int iMaxFD)
{
m_iMaxFD = iMaxFD;
m_iEpollFD = epoll_create(iMaxFD);
if(m_iEpollFD < 0)
{
return -1;
}

m_pEpollEvents = new epoll_event[iMaxFD];

return 0;
}

int CEPollFlow::Wait(int iTimeMs)
{
m_iEventNum = epoll_wait(m_iEpollFD, m_pEpollEvents, m_iMaxFD, iTimeMs);
m_iCurrEvtIdx = 0;

return m_iEventNum;
}

int CEPollFlow::Add(int iFd, long long llKey, int iFlag)
{
return Ctl(iFd,llKey,EPOLL_CTL_ADD,iFlag);
}

int CEPollFlow::Del(int iFd)
{
return Ctl(iFd, 0, EPOLL_CTL_DEL, 0);
}

int CEPollFlow::Modify(int iFd, long long llKey, int iFlag)
{
return Ctl(iFd, llKey, EPOLL_CTL_MOD, iFlag);
}

int CEPollFlow::GetEvents(long long &llKey, unsigned int &iEvent)
{
if(m_iCurrEvtIdx >= m_iEventNum)
{
return 0;
}

epoll_event* curr_event = &m_pEpollEvents[m_iCurrEvtIdx++];
llKey = curr_event->data.u64;
iEvent = curr_event->events;

return 1;
}

int CEPollFlow::Ctl(int iFd,long long llKey,int iEpollAction, int iFlag)
{
epoll_event evt;
evt.events = iFlag;
evt.data.u64 = llKey;

int ret = epoll_ctl(m_iEpollFD, iEpollAction, iFd, &evt);
if(ret < 0)
{
return -1;
}

return 0;
}