epoll实例
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#include <iostream>#include <sys/socket.h>#include <sys/epoll.h>#include <netinet/in.h>#include <arpa/inet.h>#include <fcntl.h>#include <unistd.h>#include <stdio.h>#include <errno.h>using namespace std;#define MAXLINE 5#define OPEN_MAX 100#define LISTENQ 20#define SERV_PORT 5000#define INFTIM 1000void setnonblocking(int sock){ int opts; opts=fcntl(sock,F_GETFL); if(opts<0) { perror("fcntl(sock,GETFL)"); exit(1); } opts = opts|O_NONBLOCK; if(fcntl(sock,F_SETFL,opts)<0) { perror("fcntl(sock,SETFL,opts)"); exit(1); }}int main(int argc, char* argv[]){ int i, maxi, listenfd, connfd, sockfd,epfd,nfds, portnumber; ssize_t n; char line[MAXLINE]; socklen_t clilen; if ( 2 == argc ){ if( (portnumber = atoi(argv[1])) < 0 ){ fprintf(stderr,"Usage:%s portnumber\n",argv[0]); return 1; } } else{ fprintf(stderr,"Usage:%s portnumber\n",argv[0]); return 1; } struct epoll_event ev,events[20]; epfd=epoll_create(256); struct sockaddr_in clientaddr; struct sockaddr_in serveraddr; listenfd = socket(AF_INET, SOCK_STREAM, 0); setnonblocking(listenfd); ev.data.fd=listenfd; ev.events=EPOLLIN|EPOLLET; //ev.events=EPOLLIN; epoll_ctl(epfd,EPOLL_CTL_ADD,listenfd,&ev); bzero(&serveraddr, sizeof(serveraddr)); serveraddr.sin_family = AF_INET; char *local_addr="127.0.0.1"; inet_aton(local_addr,&(serveraddr.sin_addr)); serveraddr.sin_port=htons(portnumber); bind(listenfd,(sockaddr *)&serveraddr, sizeof(serveraddr)); listen(listenfd, LISTENQ); maxi = 0; for ( ; ; ) { nfds=epoll_wait(epfd,events,20,500); for(i=0;i<nfds;++i) { if(events[i].data.fd==listenfd) { connfd = accept(listenfd,(sockaddr *)&clientaddr, &clilen); if(connfd<0){ perror("connfd<0"); exit(1); } setnonblocking(connfd); char *str = inet_ntoa(clientaddr.sin_addr); cout << "Accept a connection from " << str << endl; ev.data.fd=connfd; ev.events=EPOLLIN|EPOLLET; //ev.events=EPOLLIN; epoll_ctl(epfd,EPOLL_CTL_ADD,connfd,&ev); } else if(events[i].events&EPOLLIN) { cout << "EPOLLIN" << endl; if ( (sockfd = events[i].data.fd) < 0) continue; if ( (n = read(sockfd, line, MAXLINE)) < 0) { if (errno == ECONNRESET) { close(sockfd); events[i].data.fd = -1; } else std::cout<<"readline error"<<std::endl; } else if (n == 0) { close(sockfd); events[i].data.fd = -1; } line[n] = '/0'; ev.data.fd=sockfd; ev.events=EPOLLOUT|EPOLLET; epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev); } else if(events[i].events&EPOLLOUT) { cout << "EPOLLOUT" << endl; sockfd = events[i].data.fd; write(sockfd, line, n); ev.data.fd=sockfd; ev.events=EPOLLIN|EPOLLET; epoll_ctl(epfd,EPOLL_CTL_MOD,sockfd,&ev); } } } return 0;}#include<stdlib.h>#include<iostream>#include<sys/socket.h>#include<sys/epoll.h>#include<arpa/inet.h>#include<netinet/in.h>#include<unistd.h>#include<errno.h>#include<string.h>#include<stdio.h>#include<fcntl.h>using namespace std;#define MAXLINE 1024#define LISTEN 25#define PORT 5000void setnonblocking(int fd){int ret;ret=fcntl(fd,F_GETFL);if(ret<0){perror("fcntl error");exit(-1);}ret=ret|O_NONBLOCK;if(fcntl(fd,F_SETFL,ret)<0){perror("fcntl error");exit(-1);}}int main(){int sock,conn,epfd,nfds,max;struct sockaddr_in serveraddr,clientaddr;int n,yes=1,i,fd;char line[MAXLINE];socklen_t len;char *localaddr="127.0.0.1";struct epoll_event ev,events[20]; //important defineepfd = epoll_create(256);//memset(serveraddr,0,sizeof(struct sockaddr_in));//memset(clientaddr,0,sizeof(struct sockaddr_in));sock = socket(AF_INET,SOCK_STREAM,0);if(sock<0){perror("socket error");exit(-1);}if(setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&yes,(socklen_t)(sizeof(yes)))<0){perror("setsockopt eror");exit(-1);}setnonblocking(sock);ev.data.fd = sock;ev.events = EPOLLIN|EPOLLET; epoll_ctl(epfd,EPOLL_CTL_ADD,sock,&ev);serveraddr.sin_family = AF_INET;serveraddr.sin_port = htons(PORT);inet_aton(localaddr,&(serveraddr.sin_addr));if(bind(sock,(struct sockaddr*)&serveraddr,sizeof(serveraddr))<0){perror("bind error");exit(-1);}if(listen(sock,LISTEN)<0){perror("listen error");exit(-1);}int rc=0;int wc=0;while(1){nfds = epoll_wait(epfd,events,20,500);if(nfds<0){if(errno==EINTR){continue;}}for(i=0;i<nfds;i++){if(events[i].data.fd == sock){cout<<"+++++++++++++++accept+++++++++++++"<<endl;len = sizeof(clientaddr);conn = accept(sock,(struct sockaddr*)&clientaddr,&len);if(conn<0){perror("accept error");exit(-1);}setnonblocking(conn);ev.data.fd = conn;ev.events = EPOLLIN|EPOLLET;epoll_ctl(epfd,EPOLL_CTL_ADD,conn,&ev);}else if(events[i].events&EPOLLIN){//cout<<"+++++++++++++++EPOLLIN++++++++++++++++"<<endl;fd=events[i].data.fd;memset(line,0,MAXLINE);n=read(fd,line,MAXLINE);if(n<0){ev.data.fd = events[i].data.fd;ev.events = EPOLLIN|EPOLLET;epoll_ctl(epfd,EPOLL_CTL_MOD,fd,&ev);continue;}else if(n==0){ev.data.fd = events[i].data.fd;close(fd);epoll_ctl(epfd, EPOLL_CTL_DEL, fd, &ev);continue;}if(n>0){line[++n]='\0';cout<<"Read:"<<line<<endl;rc++;}ev.data.fd=fd;ev.events = EPOLLOUT|EPOLLET;epoll_ctl(epfd,EPOLL_CTL_MOD,fd,&ev);}else if(events[i].events&EPOLLOUT){//cout<<"+++++++++++EPOLLOUT+++++++++++++"<<endl;int ret;int fd1=events[i].data.fd;ret=write(fd1,line,n+1);if(ret<0){ev.data.fd=events[i].data.fd;ev.events = EPOLLOUT|EPOLLET;epoll_ctl(epfd,EPOLL_CTL_MOD,fd1,&ev);continue;}else if(ret==0){ev.data.fd = events[i].data.fd;close(fd1);epoll_ctl(epfd, EPOLL_CTL_DEL, fd1, &ev);continue;}if(ret>0){cout<<"Write to client:"<<line<<endl;memset(line,0,MAXLINE);}ev.data.fd = fd1;ev.events = EPOLLIN|EPOLLET;epoll_ctl(epfd,EPOLL_CTL_MOD,fd1,&ev);}}}return 0;}http://blog.csdn.net/ljx0305/article/details/4065058
http://www.cppblog.com/converse/archive/2008/10/12/63836.html
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