sub.cpp 2.39 KB
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/*
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    Copyright (c) 2007-2012 iMatix Corporation
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    Copyright (c) 2009-2011 250bpm s.r.o.
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    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
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    This file is part of 0MQ.

    0MQ 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 as published by
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    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
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    GNU Lesser General Public 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/>.
*/

#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_) :
    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
    //  filtering is off).
    options.filter = true;
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}

zmq::sub_t::~sub_t ()
{
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}
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int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
    size_t optvallen_)
{
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    if (option_ != ZMQ_SUBSCRIBE && option_ != ZMQ_UNSUBSCRIBE) {
        errno = EINVAL;
        return -1;
    }

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    //  Create the subscription message.
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    msg_t msg;
    int rc = msg.init_size (optvallen_ + 1);
    errno_assert (rc == 0);
    unsigned char *data = (unsigned char*) msg.data ();
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    if (option_ == ZMQ_SUBSCRIBE)
        *data = 1;
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    else
    if (option_ == ZMQ_UNSUBSCRIBE)
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        *data = 0;
    memcpy (data + 1, optval_, optvallen_);

    //  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)
        err = errno;
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    int rc2 = msg.close ();
    errno_assert (rc2 == 0);
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    if (rc != 0)
        errno = err;
    return rc;
}
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int zmq::sub_t::xsend (msg_t *)
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{
    //  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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zmq::sub_session_t::sub_session_t (io_thread_t *io_thread_, bool connect_,
      socket_base_t *socket_, const options_t &options_,
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      const address_t *addr_) :
    xsub_session_t (io_thread_, connect_, socket_, options_, addr_)
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{
}

zmq::sub_session_t::~sub_session_t ()
{
}