getaddrinfo and bind

struct addrinfo hints, *start, *results;
char* str_port = // some port that I receive from different function
	bzero(&hints, sizeof(struct addrinfo));
	hints.ai_flags = AI_PASSIVE; // Use address return by getaddrinfo in bind() return addrinfo will have INADDR_ANY set to IPv4 adress and INADDR6_ANY_INIT for IPv6 address
	hints.ai_family = AF_UNSPEC;  // return both the family AF_INET and AF_INET6 address structures
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_protocol = IPPROTO_TCP;
        

        getaddrinfo(NULL, str_port, &hints, &results));

start = results;
	do {
		if (results->ai_family == AF_INET || results->ai_family == AF_INET6 ) {
                      int  fd = socket(results->ai_family, results->ai_socktype, results->ai_protocol)

                      while (bind(fd, results->ai_addr, results->ai_addrlen)  < 0) {
                          // sleep for fews and retry and succeed
                     }
                     break;
               }
         } while ( (results=results->ai_next) != NULL);

Select allOpen in new window

The above code creates and bind a socket to port "str_port". Also it binds to all interfaces since I have provided flag AF_PASSIVE.

The above is called multiple times with various port number that I need to bind to all interfaces.
If for a specific port I need to bind to localhost only (both ipv4 and ipv6 socket), how can I achieve that.

Is there a different flag I need to use other than AF_PASSIVE or do I need to change the address results->ai_addr just before calling the bind?