Line data    Source code

       1             : /*
       2             :     Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
       3             : 
       4             :     This file is part of libzmq, the ZeroMQ core engine in C++.
       5             : 
       6             :     libzmq is free software; you can redistribute it and/or modify it under
       7             :     the terms of the GNU Lesser General Public License (LGPL) as published
       8             :     by the Free Software Foundation; either version 3 of the License, or
       9             :     (at your option) any later version.
      10             : 
      11             :     As a special exception, the Contributors give you permission to link
      12             :     this library with independent modules to produce an executable,
      13             :     regardless of the license terms of these independent modules, and to
      14             :     copy and distribute the resulting executable under terms of your choice,
      15             :     provided that you also meet, for each linked independent module, the
      16             :     terms and conditions of the license of that module. An independent
      17             :     module is a module which is not derived from or based on this library.
      18             :     If you modify this library, you must extend this exception to your
      19             :     version of the library.
      20             : 
      21             :     libzmq is distributed in the hope that it will be useful, but WITHOUT
      22             :     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      23             :     FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
      24             :     License for more details.
      25             : 
      26             :     You should have received a copy of the GNU Lesser General Public License
      27             :     along with this program.  If not, see <http://www.gnu.org/licenses/>.
      28             : */
      29             : 
      30             : #include "precompiled.hpp"
      31             : #include "sub.hpp"
      32             : #include "msg.hpp"
      33             : 
      34        3243 : zmq::sub_t::sub_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
      35        3243 :     xsub_t (parent_, tid_, sid_)
      36             : {
      37        3243 :     options.type = ZMQ_SUB;
      38             : 
      39             :     //  Switch filtering messages on (as opposed to XSUB which where the
      40             :     //  filtering is off).
      41        3243 :     options.filter = true;
      42        3243 : }
      43             : 
      44        3243 : zmq::sub_t::~sub_t ()
      45             : {
      46        3243 : }
      47             : 
      48         126 : int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
      49             :     size_t optvallen_)
      50             : {
      51         126 :     if (option_ != ZMQ_SUBSCRIBE && option_ != ZMQ_UNSUBSCRIBE) {
      52          36 :         errno = EINVAL;
      53          36 :         return -1;
      54             :     }
      55             : 
      56             :     //  Create the subscription message.
      57             :     msg_t msg;
      58          90 :     int rc = msg.init_size (optvallen_ + 1);
      59          90 :     errno_assert (rc == 0);
      60          90 :     unsigned char *data = (unsigned char*) msg.data ();
      61          90 :     if (option_ == ZMQ_SUBSCRIBE)
      62          90 :         *data = 1;
      63             :     else
      64           0 :     if (option_ == ZMQ_UNSUBSCRIBE)
      65           0 :         *data = 0;
      66             :     //  We explicitly allow a NULL subscription with size zero
      67          90 :     if (optvallen_) {
      68             :         assert (optval_);
      69          36 :         memcpy (data + 1, optval_, optvallen_);
      70             :     }
      71             :     //  Pass it further on in the stack.
      72          90 :     int err = 0;
      73          90 :     rc = xsub_t::xsend (&msg);
      74          90 :     if (rc != 0)
      75           0 :         err = errno;
      76          90 :     int rc2 = msg.close ();
      77          90 :     errno_assert (rc2 == 0);
      78          90 :     if (rc != 0)
      79           0 :         errno = err;
      80          90 :     return rc;
      81             : }
      82             : 
      83           0 : int zmq::sub_t::xsend (msg_t *)
      84             : {
      85             :     //  Override the XSUB's send.
      86           0 :     errno = ENOTSUP;
      87           0 :     return -1;
      88             : }
      89             : 
      90      795892 : bool zmq::sub_t::xhas_out ()
      91             : {
      92             :     //  Override the XSUB's send.
      93      795892 :     return false;
      94             : }