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ZeroMQ core engine in C++
C++ C CMake Shell Batchfile
Latest commit e56b486 @hintjens hintjens Merge pull request #1650 from c-rack/show-log-on-build-error
Solution: print test-suite.log if "make check" fails
Failed to load latest commit information.
builds Added solution and project files to build with Microsoft Visual Studi…
doc Add new option ZMQ_MULTICAST_MAXTPDU to set PGM_MTU.
include Add new option ZMQ_MULTICAST_MAXTPDU to set PGM_MTU.
packaging/nuget Update VS DLL and NuGet versioning to 4.2.0.
perf Fixed executable name in the usage string
src Set LWM to half of HWL.
tests Add test demostrating that HWM applies to messages that have been alr…
tools Problem: source file headers are somewhat confusing about LGPLv3
tweetnacl tweetNaCL: fix winrandom
.gitignore Problem: there is no test for setsockopt ZMQ_TCP_SEND/RECV_BUFFER
.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 CMake: fix library name on linux
COPYING missing COPYING file added
COPYING.LESSER Added note about tivotisation
Dockerfile Add Docker support
FindSodium.cmake CMake: use libsodium if available, else use tweet_nacl
INSTALL Added hint
MAINTAINERS Fixed email addresses in the MAITAINERS file Problem: there is no test for setsockopt ZMQ_TCP_SEND/RECV_BUFFER
NEWS Updated development master to 4.2.x Implement a definitive cygwin target for libzmq. Problem: libzmq appveyor build status is not visible
acinclude.m4 acinclude.m4: make kernel-specific flags cacheable
appveyor.yml appveyor: build all relevant combinations Check for libtoolize instead of libtool on Linux
branding.bmp Add ZeroMQ branding. Problem: test-suite.log is not accessible on failing CI build enable static libraries on mingw
installer.ico Add ZeroMQ branding. m4_esyscmd_s doesnt seem to be portable across different systems


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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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