Re: socket bind always returns 0, why?

The following code returns 0 from the bind, even when netstat clearly shows that the port is taken by another process, ie the following function will always return true. Why?

bool isPortAvailable( int port )
       {
           SOCKET candidateSocket;

           if(( candidateSocket = socket( AF_INET, SOCK_STREAM, 0 )) == -1 )
               return false;

           struct sockaddr_in serverAddress;
           memset (&serverAddress, 0, sizeof (serverAddress));

           serverAddress.sin_family = AF_INET;
           serverAddress.sin_addr.s_addr = htonl( INADDR_ANY );
           serverAddress.sin_port = htons( port );

           if( ::bind( candidateSocket, (struct sockaddr*)&serverAddress, sizeof( serverAddress )) != 0 )
           {
               closesocket( candidateSocket );
               return false;
           }

           closesocket( candidateSocket );
           return true;
       }