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Am Mittwoch, 27. März 2002 05:46 schrieb rkgupta:
> Hi Thomas,
>
> I want to use C++ Socket API. I have gone thru tdsocket.h.
> I have some queries regarding that -
>
> Is socket class use only one stream id(i/c & o/g) for sending/receving, by
> default. If yes,how can I
> change the no of stream ids and pass/use while sending/receiving ??

By default, there is only one stream in each direction. You can modify the
setting *before* binding the socket using the SCTP_INITMSG option. The
following example is copied from socket_programs/sctpterminal.cc

Socket clientSocket(Socket::IP,Socket::Stream,Socket::SCTP);
sctp_initmsg init;
init.sinit_num_ostreams = outstreams; // *** Set number of outgoing
streams ***
init.sinit_max_instreams = instreams; // *** Set max. number of
incoming streams ***
init.sinit_max_attempts = 0;
init.sinit_max_init_timeo = 60;

if(clientSocket.setSocketOption(IPPROTO_SCTP,SCTP_INITMSG,(char*)&init,sizeof(init))

< 0) {
cerr << "ERROR: Unable to set SCTP_INITMSG parameters!" << endl;
exit(1);
}
if(clientSocket.bindx((const SocketAddress**)localAddressArray,
localAddresses,
SCTP_BINDX_ADD_ADDR) == false) {
cerr << "ERROR: Unable to bind socket!" << endl;
exit(1);
}


> As in the tdsocket.h header file, there are different functions for
> sending/receiving,which one should I
> use ??

To send data via a specific stream, you have to use sendMsg() and add a
SCTP_SNDRCV control structure:

SocketMessage<CSpace(sizeof(sctp_sndrcvinfo))> message;
message.setBuffer(toSend,length);
sctp_sndrcvinfo* info =
(sctp_sndrcvinfo*)message.addHeader(sizeof(sctp_sndrcvinfo),IPPROTO_SCTP,SCTP_SNDRCV);
info->sinfo_assoc_id = 0;
info->sinfo_stream = (unsigned short)stream; // *** Set stream
number here!
info->sinfo_flags = 0;
info->sinfo_ppid = ppid;
info->sinfo_timetolive = 0;
const ssize_t result = CopySocket->sendMsg(&message.Header,0);


Using receiveMsg(), you can get the same structure from incoming chunks. See
EchoThread::run() in socket_programs/sctpterminal.cc for an example.

See also socket_programs/sctpmultiserver.cc for more example code. The
options (SCTP_INITMSG, SCTP_SNDRCV and many more) are all defined in the
socket API draft (draft-ietf-tsvwg-sctpsocket-02.txt or a newer version).


Best regards
- --
=======================================================================
Dipl.-Inform. Thomas Dreibholz
Molbachweg 7
D-51674 Wiehl-Forst Mail:
dreibh AT exp-math.uni-essen.de
Germany WWW: http://www.exp-math.uni-essen.de/~dreibh
=======================================================================


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• [SCTP-Discussion] SCTP Socket API for Release Association, rkgupta, 03/21/2002
  • Re: [SCTP-Discussion] SCTP Socket API for Release Association, Andreas Jungmaier, 03/21/2002
  • Re: [SCTP-Discussion] SCTP Socket API for Release Association, Thomas Dreibholz, 03/21/2002
    • Re: [SCTP-Discussion] SCTP Socket API for Release Association, rkgupta, 03/22/2002
      • Re: [SCTP-Discussion] SCTP Socket API for Release Association, Thomas Dreibholz, 03/25/2002
        • Re: [SCTP-Discussion] SCTP Socket API for Release Association, rkgupta, 03/27/2002
          • Re: [SCTP-Discussion] SCTP Socket API for Release Association, Thomas Dreibholz, 03/28/2002

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