Re: socket bind always returns 0, why?

From:

oxkfame@gmail.com

Newsgroups:

comp.lang.c++

Date:

Tue, 27 May 2014 11:24:22 -0700 (PDT)

Message-ID:

<a1e559ff-547f-4619-b68b-691bc34dc4ee@googlegroups.com>

This is on Linux, which I believe implements bind:
http://linux.die.net/man/7/socket
On Tuesday, May 27, 2014 12:27:58 PM UTC-5, oxk...@gmail.com wrote:

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;

        }