#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>

int main(int argc, char *argv[])
{
    int listenfd = 0, connfd = 0;
    struct sockaddr_in serv_addr;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);                                       //*********
    memset(&serv_addr, '0', sizeof(serv_addr));

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(5000);

    bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));                  //*********

    listen(listenfd, 10);                                                             //*********

    uint64_t x_recv, x_send;
    int x, n;
    while(1)
    {
        connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);                      //*********

        n = read(connfd, &x_recv, sizeof(x_recv));
        x = be64toh(x_recv);

        if(n < 0)
            printf("\n Read error \n");


        x = x*x;

        x_send = htobe64(x);
        write(connfd, &x_send, sizeof x_send);

        close(connfd);
        sleep(1);
     }
}