#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <unistd.h>/*定义close（）*/
#include <sys/types.h>/*数据类型定义*/
#include <sys/socket.h>/*提供socket函数结构*/
#include <netinet/in.h>/*定义数据结构sockaddr_in*/
#include <arpa/inet.h>/*提供IP地址转换函数*/
#include <netdb.h>/*提供设置获取域名的函数*/

#define BACKLOG 1
#define PORT 2234

int main(int argc,char *argv[])
{
    int socketfd,connectfd;
    struct sockaddr_in server;
    struct sockaddr_in client;
    socklen_t sin_size;

    if((socketfd=socket(AF_INET,SOCK_STREAM,0))==-1)
    {
        perror("creat socketfd failed!");
        exit(1);
    }

    int opt=SO_REUSEADDR;
    setsockopt(socketfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));

    bzero(&server,sizeof(server));
    server.sin_family=AF_INET;
    server.sin_port=htons(PORT);
    server.sin_addr.s_addr=htonl(INADDR_ANY);


    if(bind(socketfd,(struct sockaddr *)&server,sizeof(struct sockaddr))==-1);
    {
        perror("bind error!");
        exit(1);
    }

    if((listen(socketfd,BACKLOG))==-1)
    {
        perror("listen failed!");
        exit(1);
    }

    sin_size=sizeof(struct sockaddr_in);
    if((connectfd=accept(socketfd,(struct sockaddr *)&client,&sin_size))==-1)
    {
        perror("accept failed!");
        exit(1);
    }

    printf("you got a connection from%s:\n",inet_ntoa(client.sin_addr));
    send(connectfd,"connect to server\n",20,0);

    close(connectfd);
    close(socketfd);
    return 0;
}