Linux系统编程多路复用epoll

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define maxsize 1024
#define PORT 8888
struct sockaddr_in server,client;
int listen_socket;
int len;
void socket_init()
{
	server.sin_family = AF_INET;
	server.sin_port = htons(PORT);
	server.sin_addr.s_addr = htonl(0);
	listen_socket=socket(AF_INET,SOCK_STREAM,0);
   	if(listen_socket < 0)  
   	{ 
      		perror("socket:");
      		exit(1);   
   	}
	if(bind(listen_socket,(struct sockaddr *)&server,sizeof(server)) < 0)
   	{
      		perror("bind:");
      		exit(1);
   	}
	if(listen(listen_socket,128) < 0)
	{
		perror("listen:");
		exit(1);
	}
	printf("this is servern");
	printf("服务器初始化完成!n");

}
int main()
{
	int i,ret,epoll_fd,event_ret,new_fd;
	char recbuf[1024],sendbuf[1024];
	struct epoll_event event,events[maxsize];
	len=sizeof(client);
	socket_init();
	event.events=EPOLLIN;
	event.data.fd=listen_socket;
	epoll_fd = epoll_create(maxsize);
	epoll_ctl(epoll_fd,EPOLL_CTL_ADD,listen_socket,&event);
	len=sizeof(client);
	while(1)
	{
		event_ret=epoll_wait(epoll_fd,events,maxsize,-1);
		for(i=0;i
			if(events[i].data.fd == listen_socket)
			{
				new_fd=accept(listen_socket,(struct sockaddr *)&client,&len);
				event.data.fd=new_fd;
				epoll_ctl(epoll_fd,EPOLL_CTL_ADD,new_fd,&event);
				printf("客户%d已连接n",new_fd);
				continue;
			}
			else if(events[i].events & EPOLLIN)
			{
				ret=read(events[i].data.fd,recbuf,sizeof(recbuf));
				if(ret==0)
				{
					printf("客户%d已断开连接n",events[i].data.fd);
					close(events[i].data.fd);
					epoll_ctl(epoll_fd,EPOLL_CTL_DEL,events[i].data.fd,&event);
					continue;
				}
				printf("客户机%d:%sn",events[i].data.fd,recbuf);
				strcpy(sendbuf,recbuf);
				write(events[i].data.fd,sendbuf,sizeof(sendbuf));
			}
		}

	}
	close(listen_socket);
	close(epoll_fd);
	return 0;
}

#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define PORT 8888    
int socket_fd;       
struct sockaddr_in server;    


void socket_init()
{
  server.sin_family = AF_INET; 
  server.sin_port = htons(PORT);  
  server.sin_addr.s_addr = inet_addr("127.0.0.1");
  socket_fd = socket(AF_INET,SOCK_STREAM,0);
  if(socket_fd < 0)
  {
     	perror("socket:");
     	exit(1);
  }
  if(connect(socket_fd,(struct sockaddr *)&server,sizeof(server))<0)
  {
     perror("connect:");
     exit(1);
  }
}


int main()
{
  	char sendbuf[1024],recbuf[1024];
  	printf("this is clientn");
  	socket_init();
  	while(1)
  	{
    	scanf("%s",sendbuf);
    	if(write(socket_fd,sendbuf,sizeof(sendbuf))<0)
    	{
       		perror("write:");
       		exit(1);
    	}
    	if(read(socket_fd,recbuf,sizeof(recbuf))<0)
    	{
         	perror("read:");
         	exit(1);
    	}
    	printf("%sn",recbuf);
  	}
  close(socket_fd);
  return 0;
}