[Qt-interest] socketDescriptor in MacOSX with libssh2

[Thiago Macieira]

Em Sexta-feira 27. Novembro 2009, às 00.22.14, Filipe Maia escreveu:
> Hi,
> 
> I'm trying to use libssh2 with QTcpSocket.
> libssh2 requires a socket as returned by the socket(2) function.
> 
> I'm trying to replace:
> 
>     sock = socket(AF_INET, SOCK_STREAM, 0);
> 
> ...
> 
>     session = libssh2_session_init();
>     if (libssh2_session_startup(session, sock)) {
>         fprintf(stderr, "Failure establishing SSH session\n");
>         return -1;
>     }
> 
> where sock is a socket connected to the ssh server
> 
> by:
> 
> m_session = libssh2_session_init();
> libssh2_session_startup(m_session, m_socket->socketDescriptor());
> 
> where m_socket is a QTcpSocket connected to the ssh server.
> 
> But this doesn't seem to work (I get session failed).
> Is there a fundamental difference between socketDescriptor() and
> what's returned by socket() in MacOSX?

No, there's no fundamental difference. socketDescriptor() returns a socket 
created by a call to socket(2). Note that you must connect first before it 
creates the socket.

The problem, however, is that QTcpSocket will try to read from the socket. You 
cannot stop it from doing that. That means it will interfere with libssh2.

I recommend you do the following:
	int tmpsocket = m_socket->socketDescriptor();
	m_session = libssh2_session_init();
	libssh2_session_startup(m_session, dup(tmpsocket));
	m_socket->abort();

This will cause a new file descriptor to be created (by dup(2)) and will make 
QTcpSocket close its copy.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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