SCTP sendmsgx

[Doug Hardie]

> I am trying to get sctp_sendmsgx to work and not having a lot of success.  I have not been able to find any examples on the web of using it.  I have a client using sctp_sendmsg working fine.  I need to make use of the multihoming feature which requires sctp_sendmsgx.    I changed the call to sctp_sendmsgx, and changed the address count to 2.  However, all I get is an EINVAL response.  Looking through the code there are at least 2 different possible causes, but I can't distinguish between them. I do have two address structures in the address field.  Are there any examples of how to build a client with sctp_sendmsgx?

I am now making some progress.  If you are using the sctp_sendmsg function the sa_len or sin_len field is not used.  However, sctp_sendx does use it.  Leaving it at zero causes the problem.  sendx now sends a connection init to the remote host.  There is no server running there yet.  It hangs for quite some time and doesn't try the multihome address.  I seem to recall reading something about that so will investigate that tomorrow. 

-- Doug