if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
char txt[256];
snprintf(txt, sizeof(txt), "OS Error: %s", strerror(errno));
if ((fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
char txt[256];
snprintf(txt, sizeof(txt), "OS Error: %s", strerror(errno));