#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>
  
#define BUFSIZE 1024
      
void send_recv(int i, int sockfd)
{
   char send_buf[BUFSIZE];
   char recv_buf[BUFSIZE];
   int nbyte_recvd;
  
   if (i == 0){
       fgets(send_buf, BUFSIZE, stdin);
       if (strcmp(send_buf , "quit\n") == 0) {
           exit(0);
       }else
           send(sockfd, send_buf, strlen(send_buf), 0);
   }else {
       nbyte_recvd = recv(sockfd, recv_buf, BUFSIZE, 0);
       recv_buf[nbyte_recvd] = '';
       printf("%s\n" , recv_buf);
       fflush(stdout);
   }
}
      
      
void connect_request(int *sockfd, struct sockaddr_in *server_addr)
{
   if ((*sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
       perror("Socket");
       exit(1);
   }
   server_addr->sin_
family = AF_INET;
   server_addr->sin_port = htons(4950);
   server_addr->sin_addr.s_addr = inet_addr("127.0.0.1");
   memset(server_addr->sin_zero, '', sizeof server_addr->sin_zero);
  
   if(connect(*sockfd, (struct sockaddr *)server_addr, sizeof(struct sockaddr)) == -1) {
       perror("connect");
       exit(1);
   }
}
  
int main()
{
   int sockfd, fdmax, i;
   struct sockaddr_in server_addr;
   fd_set master;
   fd_set read_fds;
  
   connect_request(&sockfd, &server_addr);
   FD_ZERO(&master);
FD_ZERO(&read_fds);
FD_SET(0, &master);
FD_SET(sockfd, &master);
   fdmax = sockfd;
  
   while(1){
       read_fds = master;
       if(select(fdmax+1, &read_fds, NULL, NULL, NULL) == -1){
           perror("select");
           exit(4);
       }
      
       for(i=0; i <= fdmax; i++ )
           if(FD_ISSET(i, &read_fds))
               send_recv(i, sockfd);
   }
   printf("client-quited\n");
   close(sockfd);
   return 0;
}