5340215613
Solution: fix it. The documentation first states that the ZMQ_SNDMORE flag is ignored on data frames. Then it states that omitting the ZMQ_SNDMORE flag has consequences. The example HTTP server code further muddies the situation with a similar comment. The implementation of ZMQ_STREAM only accepts two-part messages. The first part is an identity frame while the second and last part is the data frame. As with any multipart message, all parts except the last need the ZMQ_SNDMORE flag. The second and last part would normally omit the ZMQ_SNDMORE flag to mark the end of the multipart message. However, the ZMQ_STREAM implementation ignores the ZMQ_SNDMORE flag on the data frame rather than requiring that it be omitted. The latter behaviour would have been more consistent with the other ZeroMQ sockets.
ZeroMQ
Welcome
The ZeroMQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. ZeroMQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.
Building and installation
See the INSTALL file included with the distribution.
Resources
Extensive documentation is provided with the distribution. Refer to doc/zmq.html, or "man zmq" after you have installed libzmq on your system.
Website: http://www.zeromq.org/
Development mailing list: zeromq-dev@lists.zeromq.org Announcements mailing list: zeromq-announce@lists.zeromq.org
Git repository: http://github.com/zeromq/libzmq
ZeroMQ developers can also be found on the IRC channel #zeromq, on the Freenode network (irc.freenode.net).
License
The project license is specified in COPYING and COPYING.LESSER.
libzmq is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (LGPL) as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
As a special exception, the Contributors give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you must extend this exception to your version of the library.
libzmq is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.