server：
#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<sys/epoll.h>
#include<errno.h>
#include<sys/socket.h>
#include<sys/types.h>
#define maxline 80000
#define port 8000
#define openmax 10000
#define backlog 10
#define buflen 1024
int main(int argc ,char* argv[]){
struct sockaddr_in servaddr,clientaddr;
socklen_t client_len = sizeof(clientaddr);
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(port);
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
int listenfd = socket(AF_INET,SOCK_STREAM,0);
if(listenfd<0){
printf("socket failed\n");
exit(1);
}
int ret = bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));
if(ret <0){
printf("bind failed\n");
exit(1);
}
ret = listen(listenfd,backlog);
int efd = epoll_create(openmax);
struct epoll_event tep,ep[openmax];
tep.events = EPOLLIN;
tep.data.fd = listenfd;
int res = epoll_ctl(efd,EPOLL_CTL_ADD,listenfd,&tep);
int nready;
int i;
int connfd,sockfd;
char str[buflen];
int num = 0;
int len ;
char buf[buflen];
while(1){
nready = epoll_wait(efd,ep,openmax,-1);
for(i = 0;i<nready;i++){
if(!(ep[i].events & EPOLLIN)){
continue;
}
if(ep[i].data.fd == listenfd){
connfd = accept(listenfd,(struct sockaddr*)&clientaddr,&client_len);
printf("received form %s \t port:%d\n",inet_ntop(AF_INET,&clientaddr.sin_addr,str,sizeof(str)),ntohs(clientaddr.sin_port));
printf("cfd %d \t client \t %d\n",connfd,++num);
tep.events = EPOLLIN;
tep.data.fd = connfd;
res = epoll_ctl(efd,EPOLL_CTL_ADD,connfd,&tep);
}
else{
sockfd = ep[i].data.fd;
len = read(sockfd,buf,buflen);
if(len == 0){
//client close
res = epoll_ctl(efd,EPOLL_CTL_DEL,sockfd,NULL);
if(res == -1){
printf("epoll fialed\n");
exit(1);
}
close(sockfd);
printf("client[%d] closed connection\n",sockfd);
}
else if(len <0){
printf("epoll failed \n");
epoll_ctl(efd,EPOLL_CTL_DEL,sockfd,NULL);
close(sockfd);
}
else{
int j;
for(j= 0;j<len;j++){
buf[j] = toupper(buf[j]);
}
write(STDOUT_FILENO,buf,len);
write(sockfd,buf,len);
}
}
}
}
close(listenfd);
close(efd);
return 0;
}