4db94043cb
Files correlati : Commento : Spostamento in libraries delle librerie esterne di Campo per una maggiore pulizia e organizzazione git-svn-id: svn://10.65.10.50/branches/R_10_00@24150 c028cbd2-c16b-5b4b-a496-9718f37d4682
942 lines
24 KiB
HTML
942 lines
24 KiB
HTML
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</head>
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<body class="manpage">
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<div id="header">
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<h1>
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zmq(7) Manual Page
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</h1>
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<h2>NAME</h2>
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<div class="sectionbody">
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<p>zmq -
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0MQ lightweight messaging kernel
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</p>
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</div>
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</div>
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<div id="content">
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<div class="sect1">
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<h2 id="_synopsis">SYNOPSIS</h2>
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<div class="sectionbody">
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<div class="paragraph"><p><strong>#include <zmq.h></strong></p></div>
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<div class="paragraph"><p><strong>cc</strong> [<em>flags</em>] <em>files</em> <strong>-lzmq</strong> [<em>libraries</em>]</p></div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_description">DESCRIPTION</h2>
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<div class="sectionbody">
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<div class="paragraph"><p>The ØMQ lightweight messaging kernel is a library which extends the standard
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socket interfaces with features traditionally provided by specialised
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<em>messaging middleware</em> products. ØMQ sockets provide an abstraction of
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asynchronous <em>message queues</em>, multiple <em>messaging patterns</em>, message
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filtering (<em>subscriptions</em>), seamless access to multiple <em>transport protocols</em>
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and more.</p></div>
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<div class="paragraph"><p>This documentation presents an overview of ØMQ concepts, describes how ØMQ
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abstracts standard sockets and provides a reference manual for the functions
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provided by the ØMQ library.</p></div>
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<div class="sect2">
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<h3 id="_context">Context</h3>
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<div class="paragraph"><p>Before using any ØMQ library functions you must create a ØMQ <em>context</em>. When
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you exit your application you must destroy the <em>context</em>. These functions let
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you work with <em>contexts</em>:</p></div>
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<div class="dlist"><dl>
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<dt class="hdlist1">
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Create a new ØMQ context
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</dt>
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<dd>
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<p>
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<a href="zmq_ctx_new.html">zmq_ctx_new(3)</a>
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</p>
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</dd>
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<dt class="hdlist1">
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Work with context properties
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</dt>
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<dd>
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<p>
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<a href="zmq_ctx_set.html">zmq_ctx_set(3)</a>
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<a href="zmq_ctx_get.html">zmq_ctx_get(3)</a>
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</p>
|
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</dd>
|
|
<dt class="hdlist1">
|
|
Destroy a ØMQ context
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
<a href="zmq_ctx_term.html">zmq_ctx_term(3)</a>
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
<div class="paragraph"><p>These deprecated functions let you create and destroy <em>contexts</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>
|
|
<div class="sect3">
|
|
<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 necessary, without any additional locking required on the part of
|
|
the caller.</p></div>
|
|
<div class="paragraph"><p>Individual ØMQ <em>sockets</em> are <em>not</em> thread safe except in the case where full
|
|
memory barriers are issued when migrating a socket from one thread to another.
|
|
In practice this means applications can create a socket in one thread with
|
|
<em>zmq_socket()</em> and then pass it to a <em>newly created</em> thread as part of thread
|
|
initialization, for example via a structure passed as an argument to
|
|
<em>pthread_create()</em>.</p></div>
|
|
</div>
|
|
<div class="sect3">
|
|
<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>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_messages">Messages</h3>
|
|
<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">
|
|
Sending and receiving a message
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
<a href="zmq_msg_send.html">zmq_msg_send(3)</a>
|
|
<a href="zmq_msg_recv.html">zmq_msg_recv(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>
|
|
<a href="zmq_msg_more.html">zmq_msg_more(3)</a>
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
Work with message properties
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
<a href="zmq_msg_get.html">zmq_msg_get(3)</a>
|
|
<a href="zmq_msg_set.html">zmq_msg_set(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>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_sockets">Sockets</h3>
|
|
<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_msg_send.html">zmq_msg_send(3)</a>
|
|
<a href="zmq_msg_recv.html">zmq_msg_recv(3)</a>
|
|
<a href="zmq_send.html">zmq_send(3)</a>
|
|
<a href="zmq_recv.html">zmq_recv(3)</a>
|
|
<a href="zmq_send_const.html">zmq_send_const(3)</a>
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
<div class="paragraph"><p>Monitoring socket events:
|
|
<a href="zmq_socket_monitor.html">zmq_socket_monitor(3)</a></p></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>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_transports">Transports</h3>
|
|
<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>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_proxies">Proxies</h3>
|
|
<div class="paragraph"><p>ØMQ provides <em>proxies</em> to create fanout and fan-in topologies. A proxy connects
|
|
a <em>frontend</em> socket to a <em>backend</em> socket and switches all messages between the
|
|
two sockets, opaquely. A proxy may optionally capture all traffic to a third
|
|
socket. To start a proxy in an application thread, use <a href="zmq_proxy.html">zmq_proxy(3)</a>.</p></div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_security">Security</h3>
|
|
<div class="paragraph"><p>A ØMQ socket can select a security mechanism. Both peers must use the same
|
|
security mechanism.</p></div>
|
|
<div class="paragraph"><p>The following security mechanisms are provided for IPC and TCP connections:</p></div>
|
|
<div class="dlist"><dl>
|
|
<dt class="hdlist1">
|
|
Null security
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
<a href="zmq_null.html">zmq_null(7)</a>
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
Plain-text authentication using username and password
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
<a href="zmq_plain.html">zmq_plain(7)</a>
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
Elliptic curve authentication and encryption
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
<a href="zmq_curve.html">zmq_curve(7)</a>
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
<div class="paragraph"><p>Generate a CURVE keypair in armored text format:
|
|
<a href="zmq_curve_keypair.html">zmq_curve_keypair(3)</a></p></div>
|
|
<div class="paragraph"><p>Convert an armored key into a 32-byte binary key:
|
|
<a href="zmq_z85_decode.html">zmq_z85_decode(3)</a></p></div>
|
|
<div class="paragraph"><p>Convert a 32-byte binary CURVE key to an armored text string:
|
|
<a href="zmq_z85_encode.html">zmq_z85_encode(3)</a></p></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<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>
|
|
</div>
|
|
<div class="sect1">
|
|
<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>
|
|
</div>
|
|
<div class="sect1">
|
|
<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>
|
|
<div class="paragraph"><p>Language bindings (C++, Python, PHP, Ruby, Java and more) are provided by
|
|
members of the ØMQ community and pointers can be found on the ØMQ website.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_authors">AUTHORS</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>This page was written by the ØMQ community. To make a change please
|
|
read the ØMQ Contribution Policy at <a href="http://www.zeromq.org/docs:contributing">http://www.zeromq.org/docs:contributing</a>.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<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: <<a href="mailto:zeromq-dev@lists.zeromq.org">zeromq-dev@lists.zeromq.org</a>></p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<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>
|
|
<div id="footnotes"><hr /></div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
ØMQ 4.0.4<br />
|
|
Last updated 2013-11-13 12:57:50 EST
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|