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
738 lines
17 KiB
HTML
738 lines
17 KiB
HTML
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<h1>
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zmq_send_const(3) 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_send_const -
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send a constant-memory message part on a socket
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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>int zmq_send_const (void <em>*socket</em>, void <em>*buf</em>, size_t <em>len</em>, int <em>flags</em>);</strong></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 <em>zmq_send_const()</em> function shall queue a message created from the buffer
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referenced by the <em>buf</em> and <em>len</em> arguments. The message buffer is assumed
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to be constant-memory and will therefore not be copied or deallocated
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in any way. The <em>flags</em> argument is a combination of the flags defined below:</p></div>
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<div class="dlist"><dl>
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<dt class="hdlist1">
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<strong>ZMQ_DONTWAIT</strong>
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</dt>
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<dd>
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<p>
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For socket types (DEALER, PUSH) that block when there are no available peers
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(or all peers have full high-water mark), specifies that the operation should
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be performed in non-blocking mode. If the message cannot be queued on the
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<em>socket</em>, the <em>zmq_send_const()</em> function shall fail with <em>errno</em> set to EAGAIN.
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</p>
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</dd>
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<dt class="hdlist1">
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<strong>ZMQ_SNDMORE</strong>
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</dt>
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<dd>
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<p>
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Specifies that the message being sent is a multi-part message, and that further
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message parts are to follow. Refer to the section regarding multi-part messages
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below for a detailed description.
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</p>
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</dd>
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</dl></div>
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<div class="admonitionblock">
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<table><tr>
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<td class="icon">
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<div class="title">Note</div>
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</td>
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<td class="content">A successful invocation of <em>zmq_send_const()</em> does not indicate that the
|
|
message has been transmitted to the network, only that it has been queued on
|
|
the <em>socket</em> and ØMQ has assumed responsibility for the message.</td>
|
|
</tr></table>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_multi_part_messages">Multi-part messages</h3>
|
|
<div class="paragraph"><p>A ØMQ message is composed of 1 or more message parts. ØMQ ensures atomic
|
|
delivery of messages: peers shall receive either all <em>message parts</em> of a
|
|
message or none at all. The total number of message parts is unlimited except
|
|
by available memory.</p></div>
|
|
<div class="paragraph"><p>An application that sends multi-part messages must use the <em>ZMQ_SNDMORE</em> flag
|
|
when sending each message part except the final one.</p></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_return_value">RETURN VALUE</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The <em>zmq_send_const()</em> function shall return number of bytes in the message
|
|
if successful. Otherwise it shall return <tt>-1</tt> and set <em>errno</em> to one of the
|
|
values defined below.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_errors">ERRORS</h2>
|
|
<div class="sectionbody">
|
|
<div class="dlist"><dl>
|
|
<dt class="hdlist1">
|
|
<strong>EAGAIN</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
Non-blocking mode was requested and the message cannot be sent at the moment.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<strong>ENOTSUP</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The <em>zmq_send_const()</em> operation is not supported by this socket type.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<strong>EFSM</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The <em>zmq_send_const()</em> operation cannot be performed on this socket at the moment
|
|
due to the socket not being in the appropriate state. This error may occur with
|
|
socket types that switch between several states, such as ZMQ_REP. See the
|
|
<em>messaging patterns</em> section of <a href="zmq_socket.html">zmq_socket(3)</a> for more information.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<strong>ETERM</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The ØMQ <em>context</em> associated with the specified <em>socket</em> was terminated.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<strong>ENOTSOCK</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The provided <em>socket</em> was invalid.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<strong>EINTR</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The operation was interrupted by delivery of a signal before the message was
|
|
sent.
|
|
</p>
|
|
</dd>
|
|
<dt class="hdlist1">
|
|
<strong>EHOSTUNREACH</strong>
|
|
</dt>
|
|
<dd>
|
|
<p>
|
|
The message cannot be routed.
|
|
</p>
|
|
</dd>
|
|
</dl></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_example">EXAMPLE</h2>
|
|
<div class="sectionbody">
|
|
<div class="listingblock">
|
|
<div class="title">Sending a multi-part message</div>
|
|
<div class="content">
|
|
<pre><tt>/* Send a multi-part message consisting of three parts to socket */
|
|
rc = zmq_send_const (socket, "ABC", 3, ZMQ_SNDMORE);
|
|
assert (rc == 3);
|
|
rc = zmq_send_const (socket, "DEFGH", 5, ZMQ_SNDMORE);
|
|
assert (rc == 5);
|
|
/* Final part; no more parts to follow */
|
|
rc = zmq_send_const (socket, "JK", 2, 0);
|
|
assert (rc == 2);</tt></pre>
|
|
</div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_see_also">SEE ALSO</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p><a href="zmq_send.html">zmq_send(3)</a>
|
|
<a href="zmq_recv.html">zmq_recv(3)</a>
|
|
<a href="zmq_socket.html">zmq_socket(7)</a>
|
|
<a href="zmq.html">zmq(7)</a></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>
|
|
<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>
|