#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#define PORT 6969
#include <stdlib.h>
#include <iostream>
#include <unistd.h>
#include <pthread.h>
# include <sys/types.h>
# include <sys/ipc.h>

using namespace std;

pthread_mutex_t m1;

int main()
{
    while(1){
        pthread_mutex_lock(&m1);
        int buf[2];//что будешь отправлять, буфер данных
        int sock;
        struct sockaddr_in addr;
        sock = socket(AF_INET, SOCK_DGRAM, 0);
        addr.sin_family = AF_INET;
        addr.sin_port = htons(PORT);
        addr.sin_addr.s_addr = htonl(INADDR_ANY);
        bind(sock, (struct sockaddr *) &addr, sizeof(addr));

        recv(sock, buf, 2, MSG_OOB);


        for (int i = 0; i < 2; i++)
            buf[i] = buf[i] * buf[i];
        send(sock, buf, 2, MSG_OOB);
        close(sock);
        pthread_mutex_unlock(&m1);

    return 0; }