ING【转载】epoll总结系列

epoll的总结之一基本的参数设置

http://fpcfjf.blog.163.com/blog/static/55469793201452095738566/?suggestedreading&wumii

epoll的总结之四LT和ET使用EPOLLONESHOT

http://fpcfjf.blog.163.com/blog/static/5546979320146193451475/

【Linux学习】epoll详解

http://blog.csdn.net/xiajun07061225/article/details/9250579

for( ; ; )
   {
       nfds = epoll_wait(epfd,events,20,500);
       for(i=0;i<nfds;++i)
       {
           if(events[i].data.fd==listenfd) //有新的连接
           {
               connfd = accept(listenfd,(sockaddr *)&clientaddr, &clilen); //accept这个连接
               ev.data.fd=connfd;
               ev.events=EPOLLIN|EPOLLET;
               epoll_ctl(epfd,EPOLL_CTL_ADD,connfd,&ev); //将新的fd添加到epoll的监听队列中
           }  

           else if( events[i].events&EPOLLIN ) //接收到数据，读socket
           {
               n = read(sockfd, line, MAXLINE)) < 0    //读
               ev.data.ptr = md;     //md为自定义类型，添加数据
               ev.events=EPOLLOUT|EPOLLET;
               epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev);//修改标识符，等待下一个循环时发送数据，异步处理的精髓
           }
           else if(events[i].events&EPOLLOUT) //有数据待发送，写socket
           {
               struct myepoll_data* md = (myepoll_data*)events[i].data.ptr;    //取数据
               sockfd = md->fd;
               send( sockfd, md->ptr, strlen((char*)md->ptr), 0 );        //发送数据
               ev.data.fd=sockfd;
               ev.events=EPOLLIN|EPOLLET;
               epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev); //修改标识符，等待下一个循环时接收数据
           }
           else
           {
               //其他的处理
           }
       }
   }