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ZeroMQ core engine in C++
C++ C CMake Shell Batchfile
Branch: master
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builds Problem: source packages lack makefiles for all systems except msvc
doc Fix typo on send documentation re: nullification
include Problem: zmq_msg_get_routing_id () is not consistent with API
packaging/nuget Update VS DLL and NuGet versioning to 4.2.0.
perf Fixed executable name in the usage string
src fixes #1315 socket monitor hangs if zmq_bind fails
tests Fix windows cmake build
tools Problem: source file headers are somewhat confusing about LGPLv3
tweetnacl Clean up after using randombytes from libsodium
.gitignore add new tests to gitignore
.hgeol Line-ending conversion rules for hg-git users and enabled use of .git…
.travis.yml CI run on OSX needs binutils
AUTHORS Problem: duplicate code for hwm check
CMakeLists.txt Update cmake to support Visual Studio 2015
COPYING missing COPYING file added
COPYING.LESSER Added note about tivotisation
Dockerfile Add Docker support
INSTALL Added hint
MAINTAINERS Fixed email addresses in the MAITAINERS file Problem: drop tests on CLIENT/SERVER are misleading
NEWS Updated development master to 4.2.x Implement a definitive cygwin target for libzmq. Fixes to README
acinclude.m4 acinclude.m4: make kernel-specific flags cacheable Check for libtoolize instead of libtool on Linux
branding.bmp Add ZeroMQ branding. Set -x in to show commands in log Default behavior is --with-libsodium=yes
installer.ico Add ZeroMQ branding. m4_esyscmd_s doesnt seem to be portable across different systems


Build Status


The ZeroMQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. ZeroMQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.

Building and installation

See the INSTALL file included with the distribution.


Extensive documentation is provided with the distribution. Refer to doc/zmq.html, or "man zmq" after you have installed libzmq on your system.


Development mailing list: Announcements mailing list:

Git repository:

ZeroMQ developers can also be found on the IRC channel #zeromq, on the Freenode network (


The project license is specified in COPYING and COPYING.LESSER.

libzmq is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (LGPL) as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

As a special exception, the Contributors give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you must extend this exception to your version of the library.

libzmq 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.

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