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Comment #1 on issue 80 by : Code Review - Fix for  
OpenSocket() causing a double free() of previously free()'d memory
http://code.google.com/p/ndt/issues/detail?id=80

The code is rather confusing. Is the goal to get two list of addrinfo's,  
the v6 addresses, and the v4 addresses? If so, why can't you create two  
lists, one v4 and one v6, doing something like:

addrinfo *ipv4_list = NULL;
addrinfo *ipv6_list = NULL;
ai = fai;
while (ai != NULL) {
    addrinfo *next = ai->ai_next;

    if (ai->ai_family == AF_INET) {
        ai->ai_next = ipv4_list;
        ipv4_list = ai;
    }
    // add similar for AF_INET6

    ai = next;
}

To get the sorted list of all v4 and v6 addresses, you just track the tail  
of the v6 linked list, and set its ai_next pointer to the v4 list.

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