Venu, Team,
the ISV has tried the sample code and ran into one problem:
The recvmsg function does not block and returns immediately with value
0. What will be problem?
Thank a lot in advance for your help.
thanks
Prameet
venugopal iyer wrote:
Prameet:
On Fri, 16 Mar 2007, Prameet Chhabra wrote:
when I run the sctpserv01 and sctpclient01 (downloaded the sample
code from the book "UNIX Network Programming, Volume 1, Third
edition" by W. Richard Stevens), the sctpserv01 failed at
Sctp_sendmsg with error "Address Already in Use".
I don't have the book handy, but I think it is because the application
is using sctp_sendmsg() on one-to-many for establishing the association
and also after it has been established. sctp_sendmsg() doesn't take an
assoc id, so it is not appropriate on a one to many (I think our man
page was modified to state this). sctp_send() with the assoc. id is be
the
more appropriate none. (The "address already in use" error is because
subsequent sctp_sendmsg() with the same address etc. tries to initiate
another association).
Also, it was discovered that there is need to use bind before
sctp_bindxvwhich, did not mentioned anywhere except the man page of
sctp_bindx on Solaris 10, which seems not match with the book.
The earlier socket drafts specified sctp_bindx() to add address(es) to
an already existing bound socket. Thus implying a previous bind(). I
know there were discussions (in the SCTP working group) that sctp_bindx()
should be allowed by itself, but I am not sure if there was an outcome
as such. Kacheong, is this something that will be clarified in subsequent
drafts (draft 14 seems to be similar to draft 11 in this regard?).
I really appreciate if you can help me to get some sample code for
mulithoming sctp application. The Programming Interface Guide gives
one example but it is one-to-one, not one-to-many style we need here.
The socket draft[1] has an example for one-to-many. I think what is
is missing from your example is using sctp_send() with the association
id (i.e after the assoc is established). If you send your example across,
I can have a look and modify, if required, and send it back to you.
-venu
[1]http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-sctpsocket-14.txt
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