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 "macros.hpp"
      32             : #include "pair.hpp"
      33             : #include "err.hpp"
      34             : #include "pipe.hpp"
      35             : #include "msg.hpp"
      36             : 
      37        6376 : zmq::pair_t::pair_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
      38             :     socket_base_t (parent_, tid_, sid_),
      39             :     pipe (NULL),
      40        6376 :     last_in (NULL)
      41             : {
      42        6376 :     options.type = ZMQ_PAIR;
      43        6376 : }
      44             : 
      45       25504 : zmq::pair_t::~pair_t ()
      46             : {
      47        6376 :     zmq_assert (!pipe);
      48       12752 : }
      49             : 
      50         217 : void zmq::pair_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
      51             : {
      52             :     LIBZMQ_UNUSED (subscribe_to_all_);
      53             : 
      54         217 :     zmq_assert (pipe_ != NULL);
      55             : 
      56             :     //  ZMQ_PAIR socket can only be connected to a single peer.
      57             :     //  The socket rejects any further connection requests.
      58         217 :     if (pipe == NULL)
      59         217 :         pipe = pipe_;
      60             :     else
      61           0 :         pipe_->terminate (false);
      62         217 : }
      63             : 
      64         217 : void zmq::pair_t::xpipe_terminated (pipe_t *pipe_)
      65             : {
      66         217 :     if (pipe_ == pipe) {
      67         217 :         if (last_in == pipe) {
      68         150 :             saved_credential = last_in->get_credential ();
      69          75 :             last_in = NULL;
      70             :         }
      71         217 :         pipe = NULL;
      72             :     }
      73         217 : }
      74             : 
      75          56 : void zmq::pair_t::xread_activated (pipe_t *)
      76             : {
      77             :     //  There's just one pipe. No lists of active and inactive pipes.
      78             :     //  There's nothing to do here.
      79          56 : }
      80             : 
      81           0 : void zmq::pair_t::xwrite_activated (pipe_t *)
      82             : {
      83             :     //  There's just one pipe. No lists of active and inactive pipes.
      84             :     //  There's nothing to do here.
      85           0 : }
      86             : 
      87         297 : int zmq::pair_t::xsend (msg_t *msg_)
      88             : {
      89         297 :     if (!pipe || !pipe->write (msg_)) {
      90           0 :         errno = EAGAIN;
      91           0 :         return -1;
      92             :     }
      93             : 
      94         297 :     if (!(msg_->flags () & msg_t::more))
      95         198 :         pipe->flush ();
      96             : 
      97             :     //  Detach the original message from the data buffer.
      98         297 :     int rc = msg_->init ();
      99         297 :     errno_assert (rc == 0);
     100             : 
     101             :     return 0;
     102             : }
     103             : 
     104         356 : int zmq::pair_t::xrecv (msg_t *msg_)
     105             : {
     106             :     //  Deallocate old content of the message.
     107         356 :     int rc = msg_->close ();
     108         356 :     errno_assert (rc == 0);
     109             : 
     110         356 :     if (!pipe || !pipe->read (msg_)) {
     111             : 
     112             :         //  Initialise the output parameter to be a 0-byte message.
     113         155 :         rc = msg_->init ();
     114         155 :         errno_assert (rc == 0);
     115             : 
     116         155 :         errno = EAGAIN;
     117         155 :         return -1;
     118             :     }
     119         201 :     last_in = pipe;
     120         201 :     return 0;
     121             : }
     122             : 
     123           0 : bool zmq::pair_t::xhas_in ()
     124             : {
     125           0 :     if (!pipe)
     126             :         return false;
     127             : 
     128           0 :     return pipe->check_read ();
     129             : }
     130             : 
     131           0 : bool zmq::pair_t::xhas_out ()
     132             : {
     133           0 :     if (!pipe)
     134             :         return false;
     135             : 
     136           0 :     return pipe->check_write ();
     137             : }
     138             : 
     139           0 : zmq::blob_t zmq::pair_t::get_credential () const
     140             : {
     141           0 :     return last_in? last_in->get_credential (): saved_credential;
     142             : }