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ØMQ 4.x stable release branch - bug fixes only
C++ M4 CMake C Shell Makefile
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builds FindAsciiDoc: fix CMP0053 warning with cmake 3.1 Jan 30, 2016
doc Revert "THREAD PRIORITY option documentation" Jun 17, 2016
foreign/openpgm Pull upstream OpenPGM 5.2.122 for multi-platform minor fixes. Dec 12, 2012
include Bump version to 4.0.9 for next release Jun 17, 2016
perf Revert "Reference platform.h by ../src/platform.h - AIX is ignoring -… Sep 20, 2013
src Problem: application metadata not parsed correctly when using CURVE Jul 2, 2019
tests Fixed wildcard IPC endpoint and added test case Jun 9, 2016
tools Fixed out-of-source build Oct 11, 2013
.gitignore Fixed wildcard IPC endpoint and added test case Jun 9, 2016
.hgeol Line-ending conversion rules for hg-git users and enabled use of .git… Nov 19, 2011
.travis.yml Problem: cannot modify ulimit anymore on Travis Jul 8, 2019
AUTHORS Problem: my name is not in the AUTHORS file Feb 16, 2016
CMakeLists.txt Fixed build with CMake >=3.4.x Feb 4, 2016
COPYING missing COPYING file added Feb 16, 2010
COPYING.LESSER Added note about tivotisation Jul 29, 2013
INSTALL Added hint Nov 22, 2012
MAINTAINERS Fixed email addresses in the MAITAINERS file Jul 18, 2011 README is no more; replace with Oct 1, 2014
NEWS Finalize NEWS and ABI revision for 4.0.9 Jul 8, 2019 README: Add hyperlinks to explicitly reference reposistories Jan 30, 2016
acinclude.m4 more flexible keepalive options detection + awful options documentation Apr 6, 2012 Solution: check for libtoolize in autogen. Fixes #131 Aug 1, 2015
branding.bmp Add ZeroMQ branding. Jun 13, 2012 Problem: Deploying release artifacts is a manual process Solution: Us… Jun 4, 2016 Finalize NEWS and ABI revision for 4.0.9 Jul 8, 2019
installer.ico Add ZeroMQ branding. Jun 13, 2012 m4_esyscmd_s doesnt seem to be portable across different systems Feb 7, 2011


Build Status


The 0MQ lightweight messaging kernel is a library which extends the standard socket interfaces with features traditionally provided by specialised messaging middleware products. 0MQ sockets provide an abstraction of asynchronous message queues, multiple messaging patterns, message filtering (subscriptions), seamless access to multiple transport protocols and more.

Stable Fork

This repository is used for making stable releases. Please do not send pull requests here unless they are specifically and only for this fork. Rather, send them to libzmq/master. Issues with test cases may be back ported to this repository by its maintainers.

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 0MQ on your system.


Development mailing list: Announcements mailing list:

Git repository:

0MQ developers can also be found on the IRC channel #zeromq, on the Freenode network (


Free use of this software is granted under the terms of the GNU Lesser General Public License (LGPL). For details see the files COPYING and COPYING.LESSER included with the 0MQ distribution.

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