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  
           }  
       }  
   }