I think you use 'setsockopt' error #12
Description
if( (setsockopt(sockfd, SOL_SOCKET, opts.size(), (char *)&opt, sizeof(opt))) < 0 ) {
cerr << "Errore setsockopt" << endl;
return -1;
}
-------------------->>>>>
if( (setsockopt(sockfd, SOL_SOCKET, opts.at(i), (char *)&opt, sizeof(opt))) < 0 ) {
cerr << "Errore setsockopt" << endl;
return -1;
}