#include <iostream>
    #include <fcntl.h>
    #include <unistd.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <arpa/inet.h>

    using namespace std;
    int main(int argc, char **argv) {

        int gniazdo = socket(PF_INET, SOCK_STREAM, 0);

        sockaddr_in addr;
        addr.sin_family = AF_INET;
        addr.sin_port = htons(13);
        addr.sin_addr.s_addr = htonl(INADDR_ANY);

        printf("%d",bind(gniazdo, (struct sockaddr*)&addr, sizeof(addr)));
        listen(gniazdo, 1);
        int s = accept(gniazdo, 0, 0);

        const char * buffer = "elo";
        int len = write(s, buffer, sizeof(buffer));
        printf("%d",len);


        shutdown(gniazdo, SHUT_RDWR);

        return 0;
    }