#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#define SERVPORT 3333
#define BACKLOG 10
#define MAX_CONNECTED_NO 10
#define MAXDATASIZE 512
void serstr(FILE *fp,int sockfd);
int main()
{
    struct sockaddr_in server_sockaddr,client_sockaddr;
    int sin_size;
    int sockfd,client_fd;
  if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1){
        perror("socket");
        exit(1);
    }
    int opt=SO_REUSEADDR;
        setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
    server_sockaddr.sin_family=AF_INET;
    server_sockaddr.sin_port=htons(SERVPORT);
    server_sockaddr.sin_addr.s_addr=INADDR_ANY;
    bzero(&(server_sockaddr.sin_zero),8);
    if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr))==-1){
        perror("bind");
        exit(1);
    }
    printf("bind success!\n");
    if(listen(sockfd,BACKLOG)==-1){
        perror("listen");
        exit(1);
    }
    printf("listening....\n");
    if((client_fd=accept(sockfd,(struct sockaddr *)&client_sockaddr,&sin_size))==-1){
        perror("accept");
        exit(1);
    }

  serstr(stdin,client_fd);
    close(sockfd);
}

void serstr(FILE *fp,int sockfd)
{
   char buf[MAXDATASIZE],sends[MAXDATASIZE];
   int recvbytes;
   while(1)
   {if((recvbytes=recv(sockfd,buf,MAXDATASIZE,0))!=-1)
      {
             buf[recvbytes]='\0';
         printf("received from client:%s\n",buf);
         }
     printf("Please input words\n");
     if(fgets(sends,MAXDATASIZE,fp)!=NULL)
       {   
          send(sockfd,sends,strlen(sends)+1,0);
          printf("sent to client:%s\n");
        }
          
   }
}