> -8. The compiler will warn if you get it right.

> bind() socket library call ... takes a struct sockaddr [when you are usually using a struct sockaddr_in]

Except the compiler is correct. If you want to use a polymorphic type in a generic call that requires the parent type, you should include a cast.

From the example in my man page for bind(2):

    int main(int argc, char *argv[])
    {
        int sfd;
        struct sockaddr_un my_addr;
    
        /* ... */
          
        if (bind(sfd, (struct sockaddr *) &my_addr,
                   sizeof(struct sockaddr_un)) == -1)
            handle_error("bind");

        /* ,,, */