From a15854bd92db69fcd0b4444fe1b8fe3610a7acf6 Mon Sep 17 00:00:00 2001
From: Martin Lucina <martin@lucina.net>
Date: Mon, 23 Jan 2012 08:53:19 +0100
Subject: Imported Upstream version 2.0.7.dfsg

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+<body>
+<div id="header">
+<h1>
+zmq(7) Manual Page
+</h1>
+<h2>NAME</h2>
+<div class="sectionbody">
+<p>zmq -
+   0MQ lightweight messaging kernel
+</p>
+</div>
+</div>
+<div id="content">
+<h2 id="_synopsis">SYNOPSIS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><strong>#include &lt;zmq.h&gt;</strong></p></div>
+<div class="paragraph"><p><strong>cc</strong> [<em>flags</em>] <em>files</em> <strong>-lzmq</strong> [<em>libraries</em>]</p></div>
+</div>
+<h2 id="_description">DESCRIPTION</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The ØMQ lightweight messaging kernel is a library which extends the standard
+socket interfaces with features traditionally provided by specialised
+<em>messaging middleware</em> products. ØMQ sockets provide an abstraction of
+asynchronous  <em>message queues</em>, multiple <em>messaging patterns</em>, message
+filtering (<em>subscriptions</em>), seamless access to multiple <em>transport protocols</em>
+and more.</p></div>
+<div class="paragraph"><p>This documentation presents an overview of ØMQ concepts, describes how ØMQ
+abstracts standard sockets and provides a reference manual for the functions
+provided by the ØMQ library.</p></div>
+<h3 id="_context">Context</h3><div style="clear:left"></div>
+<div class="paragraph"><p>Before using any ØMQ library functions the caller must initialise a ØMQ
+<em>context</em> using <em>zmq_init()</em>. The following functions are provided to handle
+initialisation and termination of a <em>context</em>:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Initialise ØMQ context
+</dt>
+<dd>
+<p>
+    <a href="zmq_init.html">zmq_init(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Terminate ØMQ context
+</dt>
+<dd>
+<p>
+    <a href="zmq_term.html">zmq_term(3)</a>
+</p>
+</dd>
+</dl></div>
+<h4 id="_thread_safety">Thread safety</h4>
+<div class="paragraph"><p>A ØMQ <em>context</em> is thread safe and may be shared among as many application
+threads as the application has requested using the <em>app_threads</em> parameter to
+<em>zmq_init()</em>, without any additional locking required on the part of the
+caller.  Each ØMQ socket belonging to a particular <em>context</em> may only be used
+by <strong>the thread that created it</strong> using <em>zmq_socket()</em>.</p></div>
+<h4 id="_multiple_contexts">Multiple contexts</h4>
+<div class="paragraph"><p>Multiple <em>contexts</em> may coexist within a single application. Thus, an
+application can use ØMQ directly and at the same time make use of any number of
+additional libraries or components which themselves make use of ØMQ as long as
+the above guidelines regarding thread safety are adhered to.</p></div>
+<h3 id="_messages">Messages</h3><div style="clear:left"></div>
+<div class="paragraph"><p>A ØMQ message is a discrete unit of data passed between applications or
+components of the same application. ØMQ messages have no internal structure and
+from the point of view of ØMQ itself they are considered to be opaque binary
+data.</p></div>
+<div class="paragraph"><p>The following functions are provided to work with messages:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Initialise a message
+</dt>
+<dd>
+<p>
+    <a href="zmq_msg_init.html">zmq_msg_init(3)</a>
+    <a href="zmq_msg_init_size.html">zmq_msg_init_size(3)</a>
+    <a href="zmq_msg_init_data.html">zmq_msg_init_data(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Release a message
+</dt>
+<dd>
+<p>
+    <a href="zmq_msg_close.html">zmq_msg_close(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Access message content
+</dt>
+<dd>
+<p>
+    <a href="zmq_msg_data.html">zmq_msg_data(3)</a>
+    <a href="zmq_msg_size.html">zmq_msg_size(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Message manipulation
+</dt>
+<dd>
+<p>
+    <a href="zmq_msg_copy.html">zmq_msg_copy(3)</a>
+    <a href="zmq_msg_move.html">zmq_msg_move(3)</a>
+</p>
+</dd>
+</dl></div>
+<h3 id="_sockets">Sockets</h3><div style="clear:left"></div>
+<div class="paragraph"><p>ØMQ sockets present an abstraction of a asynchronous <em>message queue</em>, with the
+exact queueing semantics depending on the socket type in use. See
+<a href="zmq_socket.html">zmq_socket(3)</a> for the socket types provided.</p></div>
+<div class="paragraph"><p>The following functions are provided to work with sockets:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Creating a socket
+</dt>
+<dd>
+<p>
+    <a href="zmq_socket.html">zmq_socket(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Closing a socket
+</dt>
+<dd>
+<p>
+    <a href="zmq_close.html">zmq_close(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Manipulating socket options
+</dt>
+<dd>
+<p>
+    <a href="zmq_getsockopt.html">zmq_getsockopt(3)</a>
+    <a href="zmq_setsockopt.html">zmq_setsockopt(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Establishing a message flow
+</dt>
+<dd>
+<p>
+    <a href="zmq_bind.html">zmq_bind(3)</a>
+    <a href="zmq_connect.html">zmq_connect(3)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Sending and receiving messages
+</dt>
+<dd>
+<p>
+    <a href="zmq_send.html">zmq_send(3)</a>
+    <a href="zmq_recv.html">zmq_recv(3)</a>
+</p>
+</dd>
+</dl></div>
+<div class="paragraph"><div class="title">Input/output multiplexing</div><p>ØMQ provides a mechanism for applications to multiplex input/output events over
+a set containing both ØMQ sockets and standard sockets. This mechanism mirrors
+the standard <em>poll()</em> system call, and is described in detail in
+<a href="zmq_poll.html">zmq_poll(3)</a>.</p></div>
+<h3 id="_transports">Transports</h3><div style="clear:left"></div>
+<div class="paragraph"><p>A ØMQ socket can use multiple different underlying transport mechanisms.
+Each transport mechanism is suited to a particular purpose and has its own
+advantages and drawbacks.</p></div>
+<div class="paragraph"><p>The following transport mechanisms are provided:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Unicast transport using TCP
+</dt>
+<dd>
+<p>
+    <a href="zmq_tcp.html">zmq_tcp(7)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Reliable multicast transport using PGM
+</dt>
+<dd>
+<p>
+    <a href="zmq_pgm.html">zmq_pgm(7)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Local inter-process communication transport
+</dt>
+<dd>
+<p>
+    <a href="zmq_ipc.html">zmq_ipc(7)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Local in-process (inter-thread) communication transport
+</dt>
+<dd>
+<p>
+    <a href="zmq_inproc.html">zmq_inproc(7)</a>
+</p>
+</dd>
+</dl></div>
+<h3 id="_devices">Devices</h3><div style="clear:left"></div>
+<div class="paragraph"><p>Apart from the ØMQ library the ØMQ distribution includes <em>devices</em> which are
+building blocks intended to serve as intermediate nodes in complex messaging
+topologies.</p></div>
+<div class="paragraph"><p>The following devices are provided:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Forwarder device for request-response messaging
+</dt>
+<dd>
+<p>
+    <a href="zmq_queue.html">zmq_queue(1)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Forwarder device for publish-subscribe messaging
+</dt>
+<dd>
+<p>
+    <a href="zmq_forwarder.html">zmq_forwarder(1)</a>
+</p>
+</dd>
+<dt class="hdlist1">
+Streamer device for parallelized pipeline messaging
+</dt>
+<dd>
+<p>
+    <a href="zmq_streamer.html">zmq_streamer(1)</a>
+</p>
+</dd>
+</dl></div>
+</div>
+<h2 id="_error_handling">ERROR HANDLING</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The ØMQ library functions handle errors using the standard conventions found on
+POSIX systems. Generally, this means that upon failure a ØMQ library function
+shall return either a NULL value (if returning a pointer) or a negative value
+(if returning an integer), and the actual error code shall be stored in the
+<em>errno</em> variable.</p></div>
+<div class="paragraph"><p>On non-POSIX systems some users may experience issues with retrieving the
+correct value of the <em>errno</em> variable. The <em>zmq_errno()</em> function is provided
+to assist in these cases; for details refer to <a href="zmq_errno.html">zmq_errno(3)</a>.</p></div>
+<div class="paragraph"><p>The <em>zmq_strerror()</em> function is provided to translate ØMQ-specific error codes
+into error message strings; for details refer to <a href="zmq_strerror.html">zmq_strerror(3)</a>.</p></div>
+</div>
+<h2 id="_miscellaneous">MISCELLANEOUS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The following miscellaneous functions are provided:</p></div>
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Report ØMQ library version
+</dt>
+<dd>
+<p>
+    <a href="zmq_version.html">zmq_version(3)</a>
+</p>
+</dd>
+</dl></div>
+</div>
+<h2 id="_language_bindings">LANGUAGE BINDINGS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The ØMQ library provides interfaces suitable for calling from programs in any
+language; this documentation documents those interfaces as they would be used
+by C programmers. The intent is that programmers using ØMQ from other languages
+shall refer to this documentation alongside any documentation provided by the
+vendor of their language binding.</p></div>
+<h3 id="_c_language_binding">C++ language binding</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The ØMQ distribution includes a C++ language binding, which is documented
+separately in <a href="zmq_cpp.html">zmq_cpp(7)</a>.</p></div>
+<h3 id="_other_language_bindings">Other language bindings</h3><div style="clear:left"></div>
+<div class="paragraph"><p>Other language bindings (Python, Ruby, Java and more) are provided by members
+of the ØMQ community and pointers can be found on the ØMQ website.</p></div>
+</div>
+<h2 id="_authors">AUTHORS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The ØMQ documentation was written by Martin Sustrik &lt;<a href="mailto:sustrik@250bpm.com">sustrik@250bpm.com</a>&gt; and
+Martin Lucina &lt;<a href="mailto:mato@kotelna.sk">mato@kotelna.sk</a>&gt;.</p></div>
+</div>
+<h2 id="_resources">RESOURCES</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Main web site: <a href="http://www.zeromq.org/">http://www.zeromq.org/</a></p></div>
+<div class="paragraph"><p>Report bugs to the ØMQ development mailing list: &lt;<a href="mailto:zeromq-dev@lists.zeromq.org">zeromq-dev@lists.zeromq.org</a>&gt;</p></div>
+</div>
+<h2 id="_copying">COPYING</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Free use of this software is granted under the terms of the GNU Lesser General
+Public License (LGPL). For details see the files <tt>COPYING</tt> and <tt>COPYING.LESSER</tt>
+included with the ØMQ distribution.</p></div>
+</div>
+</div>
+<div id="footnotes"><hr /></div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2010-06-03 14:07:32 CEST
+</div>
+</div>
+</body>
+</html>
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