Server rewrite - Before the rewrite

int s;
struct sockaddr_in sin;

s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_port = htons(80);
if (bind(s, &sin, sizeof(sin)) < 0)
    exit(1);
listen(s, 5);