Linux网络编程epoll模型
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- #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)
- {
-
- char line[MAX_LINE];
- cout << "开始读取数据" << endl;
- int n = read(clientFd, line, sizeof(line));
- if(n < 0)
- {
-
- 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);
-
-
- 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");
-
- 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)
- {
- 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));
-
-
- 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);
- }
-
- }
- }
- }