Stop and Wait Server

#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#define PORT 8080
#define MAX 80
void transfer(int sock){
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof tv);
      printf("Send\tFrame status\tACK status");
        int *n,i=0,j,o,k=0;
        n=&i;
       for(j=0;j<10;j++){
         o=i;
        TES:
        k++;
          i=j%2;


          write(sock,n,sizeof(i));
          printf("\n%d\t Frame no:%d\t",j,i);
          if(k==3){
          printf("ACK missing");
          goto TES;
          continue;
          }
          if(read(sock,n,sizeof(i))){
          if(i==o){
            printf("Frame missing");
            goto TES;
          }
          else
             printf("ACK no:%d",i);

          }


      }

}

int main(int argc, char const* argv[])
{
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1,n;
    int addrlen = sizeof(address);



    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0))
        == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET,
                SO_REUSEADDR | SO_REUSEPORT, &opt,
                sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr*)&address,
            sizeof(address))
        < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    if ((new_socket
        = accept(server_fd, (struct sockaddr*)&address,
                (socklen_t*)&addrlen))
        < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    transfer(new_socket);
// closing the connected socket
    close(new_socket);
// closing the listening socket
    shutdown(server_fd, SHUT_RDWR);
    return 0;
}