どっちでも動くTCP server (2)

i = 0;
for (res = res0; res; res = res->ai_next) {
    s = socket(res->ai_family, res->ai_socktype,
            res->ai_protocol);
    if (s < 0)
        continue;
    if (bind(s, res->ai_addr,
            res->ai_addrlen) >= 0) {
        close(s);
        continue;
    }
    listen(s, 5);
    socktable[i] = s;
    sockfamily[i++] = res->ai_family;
}
freeaddrinfo(res0);
if (i == 0)
    errx(1, "no bind() successful");