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95 lines
2.8 KiB
C++
95 lines
2.8 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.hpp"
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#include "sub.hpp"
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#include "msg.hpp"
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zmq::sub_t::sub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
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xsub_t (parent_, tid_, sid_)
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{
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options.type = ZMQ_SUB;
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// Switch filtering messages on (as opposed to XSUB which where the
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// filtering is off).
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options.filter = true;
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}
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zmq::sub_t::~sub_t ()
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{
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}
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int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
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size_t optvallen_)
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{
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if (option_ != ZMQ_SUBSCRIBE && option_ != ZMQ_UNSUBSCRIBE) {
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errno = EINVAL;
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return -1;
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}
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// Create the subscription message.
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msg_t msg;
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int rc = msg.init_size (optvallen_ + 1);
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errno_assert (rc == 0);
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unsigned char *data = (unsigned char*) msg.data ();
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if (option_ == ZMQ_SUBSCRIBE)
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*data = 1;
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else
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if (option_ == ZMQ_UNSUBSCRIBE)
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*data = 0;
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// We explicitly allow a NULL subscription with size zero
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if (optvallen_) {
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assert (optval_);
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memcpy (data + 1, optval_, optvallen_);
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}
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// Pass it further on in the stack.
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int err = 0;
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rc = xsub_t::xsend (&msg);
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if (rc != 0)
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err = errno;
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int rc2 = msg.close ();
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errno_assert (rc2 == 0);
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if (rc != 0)
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errno = err;
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return rc;
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}
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int zmq::sub_t::xsend (msg_t *)
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{
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// Override the XSUB's send.
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errno = ENOTSUP;
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return -1;
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}
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bool zmq::sub_t::xhas_out ()
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{
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// Override the XSUB's send.
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return false;
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}
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