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server.c
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server.c
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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/epoll.h>
#include <fcntl.h>
#define PORT 3000 //端口号
#define BACKLOG 5 /*最大监听数*/
#define MAX_EVENT_NUM 1024 //epoll事件最大数量
#define BUFFER_SIZE 10
#define true 1
#define false 0
void addFd(int epollFd, int listenFd, int enableEt)
{
struct epoll_event event;
event.data.fd = listenFd;
event.events = EPOLLIN;
if (enableEt)
{
event.events |= EPOLLET;
}
epoll_ctl(epollFd, EPOLL_CTL_ADD, listenFd, &event);
}
void lt(struct epoll_event *events, int num, int epollFd, int listenFd)
{
int i = 0;
char buf[BUFFER_SIZE];
for (i = 0; i < num; i++)
{
int sockfd = events[i].data.fd;
if (sockfd == listenFd)
{
struct sockaddr_in clientaddr;
socklen_t clilen = sizeof(clientaddr);
int connfd = accept(listenFd, (struct sockaddr *)&clientaddr, &clilen);
addFd(epollFd, connfd, false); //对connfd使用默认的lt模式
}
else if (events[i].events & EPOLLIN)
{ //只要socket读缓存中还有未读的数据,这段代码就会触发
printf("event trigger once\n");
memset(buf, '\0', BUFFER_SIZE);
int ret = recv(sockfd, buf, BUFFER_SIZE - 1, 0);
if (ret <= 0)
{
close(sockfd);
continue;
}
printf("get %d bytes of content:%s\n", ret, buf);
}
else
{
printf("something else happened\n");
}
}
}
void et(struct epoll_event *event, int num, int epollFd, int listenFd)
{
int i = 0;
char buf[BUFFER_SIZE];
for (i = 0; i < num; i++)
{
int sockfd = event[i].data.fd;
if (sockfd == listenFd)
{
struct sockaddr_in clientaddr;
int clilen = sizeof(clientaddr);
int connfd = accept(listenFd, (struct sockaddr *)&clientaddr, &clilen);
addFd(epollFd, connfd, true); //多connfd开启ET模式
}
else if (event[i].events & EPOLLIN)
{
printf("event trigger once\n");
while (1)
{ //这段代码不会重复触发,所以要循环读取数据
memset(buf, '\0', BUFFER_SIZE);
int ret = recv(sockfd, buf, BUFFER_SIZE - 1, 0);
if (ret < 0)
{
if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
{
printf("read later\n");
break;
}
close(sockfd);
break;
}
else if (ret == 0)
{
close(sockfd);
}
else
{
printf("get %d bytes of content:%s\n", ret, buf);
}
}
}
else
{
printf("something else happened \n");
}
}
}
int main()
{
int sockfd, new_fd; /*socket句柄和建立连接后的句柄*/
struct sockaddr_in my_addr; /*本方地址信息结构体,下面有具体的属性赋值*/
struct sockaddr_in their_addr; /*对方地址信息*/
int sin_size;
struct epoll_event events[MAX_EVENT_NUM];
sockfd = socket(AF_INET, SOCK_STREAM, 0); //建立socket
if (sockfd == -1)
{
printf("socket failed:%d\n", errno);
return -1;
}
my_addr.sin_family = AF_INET; /*该属性表示接收本机或其他机器传输*/
my_addr.sin_port = htons(PORT); /*端口号*/
my_addr.sin_addr.s_addr = htonl(INADDR_ANY); /*IP,括号内容表示本机IP*/
bzero(&(my_addr.sin_zero), 8); /*将其他属性置0*/
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) < 0)
{ //绑定地址结构体和socket
printf("bind error\n");
return -1;
}
listen(sockfd, BACKLOG); //开启监听 ,第二个参数是最大监听数
int epollFd = epoll_create(5);
if (epollFd < 0)
{
perror('epoll_create err');
exit(1);
}
addFd(epollFd, sockfd, true);
while (1)
{
int ret = epoll_wait(epollFd, events, MAX_EVENT_NUM, -1);
if (ret < 0)
{
printf("epoll failure\n");
break;
}
//lt(events, ret, epollFd, sockfd);//lt模式
et(events, ret, epollFd, sockfd); //et模式
}
close(sockfd);
return 0;
}