Linux网络编程epoll模型

 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/epoll.h>
 #include <errno.h>
 #include <netinet/in.h>
 #include <unistd.h>
 #include <arpa/inet.h>
 #include <stdlib.h>

 #include <iostream>
 using namespace std;

 #define LISTENQ 5
 #define OPEN_MAX 1024
 #define SERV_PORT  10088
 #define MAX_LINE 1024
 #define INFTIM -1

 #define MAXEVENTS 1000

 void echo_srv(int clientFd)
 {
     //处理用户请求数据
     char line[MAX_LINE];
     cout << "开始读取数据" << endl;
     int n = read(clientFd, line, sizeof(line));
     if(n < 0)
     {
         //#define ECONNRESET 104  /* Connection reset by peer */
         if(errno == ECONNRESET)
         {
             close(clientFd);
             printf("异常退出\n");
         }
         else
         {
                 printf("网络异常");
                 exit(-1);
         }
     }
     else if(n == 0)
     {
         close(clientFd);
         printf("正常退出\n");
     }
     else
     {
         line[n] = 0;
         printf("接收到数据:%s\n", line);
         write(clientFd, line, n);
     }
 }

 int main(int argc, char** argv)
 {
     struct sockaddr_in cliaddr, servaddr;
     int listenFd = socket(AF_INET, SOCK_STREAM, 0);
     if( listenFd < 0)
     {
         printf("socket函数执行失败");
         return 1;
     }

     servaddr.sin_family = AF_INET;
     servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
     //inet_aton('10.132.10.64', &(servaddr.sin_addr));
     //servaddr.sin_addr.s_addr = inet_addr("10.132.10.64");
     servaddr.sin_port = htons(SERV_PORT);
     if(bind(listenFd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
     {
         printf("bind函数执行失败");
         return 1;
     }

     if(listen(listenFd, LISTENQ) < 0)
     {
             printf("listen函数执行失败");
         return 1;
     }
     printf("listen函数执行成功\n");
     //epoll部分
     int epollFd;
     if ((epollFd = epoll_create(1)) == -1) {
         cerr << "create epoll_create falid" << endl;
         return false;
    }

     epoll_event epollEvent;
     epollEvent.data.fd = listenFd;
     epollEvent.events = EPOLLIN | EPOLLET;
     if (epoll_ctl(epollFd, EPOLL_CTL_ADD, listenFd, &epollEvent) != 0)
     {
         cerr << "create epoll err!" << endl;
         return 1;
     }
         cout << "create epoll ok!" << endl;
         epoll_event *pEpollEvents = new epoll_event[MAXEVENTS];

         while(true)
         {
             int n = epoll_wait(epollFd, pEpollEvents, MAXEVENTS, -1);

             cout << "epoll wait conn" << endl;
             for(int i = 0; i < n; i++)
             {
                 epoll_event& e = pEpollEvents[i];
                 if((e.events & EPOLLERR) || (e.events & EPOLLHUP) || (!(e.events & EPOLLIN)))
                 {
                      cerr << "epoll error for client " << e.data.fd << endl;
                      close(e.data.fd);
                 }
                 else if(listenFd == e.data.fd)  //处理用户连接
                 {
                         socklen_t clilen = sizeof(cliaddr);
                         int connfd = accept(listenFd, (struct sockaddr*)&cliaddr, &clilen);
                         if(connfd < 0)
                         {
                             if ((errno != EAGAIN) && (errno != EWOULDBLOCK))
                             {
                     cerr << "fail to accept new client " << endl;
                     continue;
                   }
                         }
                         printf("Ip: %s 到此一游\n", inet_ntoa(cliaddr.sin_addr));

                         //将用户连接加入epoll中进行监视
                         e.data.fd = connfd;
                     e.events = EPOLLIN | EPOLLET;
                   if (epoll_ctl(epollFd, EPOLL_CTL_ADD, connfd, &e) != 0)
             {
                  cerr << "create epoll err!" << endl;
                  continue;
             }
                 }
                 else
                 {
                     echo_srv(e.data.fd);
                 }

             }
         }
 }