Linux網路編程epoll模型

來源:互聯網
上載者:User
#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 1000void echo_srv(int clientFd){//處理使用者請求資料char line[MAX_LINE];cout << "開始讀取資料" << endl;int n = read(clientFd, line, sizeof(line));if(n < 0){//#define ECONNRESET 104  /* Connection reset by peer */if(errno == ECONNRESET){close(clientFd);printf("異常退出\n");}else{printf("網路異常");exit(-1);}}else if(n == 0){close(clientFd);printf("正常退出\n");}else{line[n] = 0;printf("接收到資料:%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函數執行失敗");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函數執行失敗");  return 1;}if(listen(listenFd, LISTENQ) < 0){printf("listen函數執行失敗");  return 1;}printf("listen函數執行成功\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)  //處理使用者串連{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 到此一遊\n", inet_ntoa(cliaddr.sin_addr));//將使用者串連加入epoll中進行監視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);}}}}

 

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