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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sub.hpp"
#include "msg.hpp"
zmq::sub_t::sub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
xsub_t (parent_, tid_, sid_)
{
options.type = ZMQ_SUB;
// Switch filtering messages on (as opposed to XSUB which where the
// filtering is off).
options.filter = true;
}
zmq::sub_t::~sub_t ()
{
}
int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
size_t optvallen_)
{
if (option_ != ZMQ_SUBSCRIBE && option_ != ZMQ_UNSUBSCRIBE) {
errno = EINVAL;
return -1;
}
// Create the subscription message.
msg_t msg;
int rc = msg.init_size (optvallen_ + 1);
errno_assert (rc == 0);
unsigned char *data = (unsigned char*) msg.data ();
if (option_ == ZMQ_SUBSCRIBE)
*data = 1;
else
if (option_ == ZMQ_UNSUBSCRIBE)
*data = 0;
memcpy (data + 1, optval_, optvallen_);
// Pass it further on in the stack.
int err = 0;
rc = xsub_t::xsend (&msg);
if (rc != 0)
err = errno;
int rc2 = msg.close ();
errno_assert (rc2 == 0);
if (rc != 0)
errno = err;
return rc;
}
int zmq::sub_t::xsend (msg_t *)
{
// Overload the XSUB's send.
errno = ENOTSUP;
return -1;
}
bool zmq::sub_t::xhas_out ()
{
// Overload the XSUB's send.
return false;
}
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