#include <iostream>
#include <sys/socket.h>
#include <netinet/in.h>
#include <cstring>
//#include <sys/types.h>
//#include <unistd.h>

#define PORT 6666

void err(const char *s)
{
    perror(s);
    exit(1);
}

using namespace std;

int main()
{
    int sock_fd,new_sock;
    struct sockaddr_in s_addr;
//    int opt = 1;
    int addrlen = sizeof(s_addr);
    char buffer[256] = {0};
    char *hi = (char*)"Witamy na serwerze!";
    sock_fd = socket(AF_INET, SOCK_STREAM, 0); // tworzymy gniazdo
    if (sock_fd < 1) err("Blad otwierania gniazda!");
  //  t = setsockopt(sock_fd,SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt));
  //  if (t !=0 ) err("Error on sockopt")
    s_addr.sin_family = AF_INET; //ipv4
    s_addr.sin_addr.s_addr = INADDR_ANY; // aktualny adres IP
    s_addr.sin_port = htons(PORT); //na sieciowy porzadek bajtow
    if (bind(sock_fd, (struct sockaddr *)&s_addr,sizeof(s_addr)) < 0)
        err("Blad podpinania portu");
    listen(sock_fd,3); //kolejka ustawiona na 3
    new_sock = accept(sock_fd, (struct sockaddr *)&s_addr,(socklen_t*)&addrlen);
    if (new_sock < 0) err("Blad akceptowania polaczen");
    send(new_sock, hi, strlen(hi),0);
    return 0;
}