diff options
| author | Martin Lucina <martin@lucina.net> | 2012-01-23 08:53:19 +0100 |
|---|---|---|
| committer | Martin Lucina <martin@lucina.net> | 2012-01-23 08:53:19 +0100 |
| commit | a15854bd92db69fcd0b4444fe1b8fe3610a7acf6 (patch) | |
| tree | 1214b945d0f0033ff318de367c70525ea141ef56 /doc/zmq_getsockopt.html | |
Imported Upstream version 2.0.7.dfsgupstream/2.0.7.dfsg
Diffstat (limited to 'doc/zmq_getsockopt.html')
| -rw-r--r-- | doc/zmq_getsockopt.html | 1192 |
1 files changed, 1192 insertions, 0 deletions
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+<body>
+<div id="header">
+<h1>
+zmq_getsockopt(3) Manual Page
+</h1>
+<h2>NAME</h2>
+<div class="sectionbody">
+<p>zmq_getsockopt -
+ get 0MQ socket options
+</p>
+</div>
+</div>
+<div id="content">
+<h2 id="_synopsis">SYNOPSIS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><strong>int zmq_getsockopt (void <em>*socket</em>, int <em>option_name</em>, void <em>*option_value</em>, size_t <em>*option_len</em>);</strong></p></div>
+</div>
+<h2 id="_description">DESCRIPTION</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The <em>zmq_getsockopt()</em> function shall retrieve the value for the option
+specified by the <em>option_name</em> argument for the ØMQ socket pointed to by the
+<em>socket</em> argument, and store it in the buffer pointed to by the <em>option_value</em>
+argument. The <em>option_len</em> argument is the size in bytes of the buffer pointed
+to by <em>option_value</em>; upon successful completion <em>zmq_getsockopt()</em> shall
+modify the <em>option_value</em> argument to indicate the actual size of the option
+value stored in the buffer.</p></div>
+<div class="paragraph"><p>The following options can be retrieved with the <em>zmq_getsockopt()</em> function:</p></div>
+<h3 id="_zmq_rcvmore_more_message_parts_to_follow">ZMQ_RCVMORE: More message parts to follow</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RCVMORE</em> option shall return a boolean value indicating if the
+multi-part message currently being read from the specified <em>socket</em> has more
+message parts to follow. If there are no message parts to follow or if the
+message currently being read is not a multi-part message a value of zero shall
+be returned. Otherwise, a value of 1 shall be returned.</p></div>
+<div class="paragraph"><p>Refer to <a href="zmq_send.html">zmq_send(3)</a> and <a href="zmq_recv.html">zmq_recv(3)</a> for a detailed description
+of sending/receiving multi-part messages.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+int64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+boolean
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+N/A
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_hwm_retrieve_high_water_mark">ZMQ_HWM: Retrieve high water mark</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_HWM</em> option shall retrieve the high water mark for the specified
+<em>socket</em>. The high water mark is a hard limit on the maximum number of
+outstanding messages ØMQ shall queue in memory for any single peer that the
+specified <em>socket</em> is communicating with.</p></div>
+<div class="paragraph"><p>If this limit has been reached the socket shall enter an exceptional state and
+depending on the socket type, ØMQ shall take appropriate action such as
+blocking or dropping sent messages. Refer to the individual socket descriptions
+in <a href="zmq_socket.html">zmq_socket(3)</a> for details on the exact action taken for each socket
+type.</p></div>
+<div class="paragraph"><p>The default <em>ZMQ_HWM</em> value of zero means "no limit".</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+int64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+messages
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+0
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_swap_retrieve_disk_offload_size">ZMQ_SWAP: Retrieve disk offload size</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_SWAP</em> option shall retrieve the disk offload (swap) size for the
+specified <em>socket</em>. A socket which has <em>ZMQ_SWAP</em> set to a non-zero value may
+exceed it’s high water mark; in this case outstanding messages shall be
+offloaded to storage on disk rather than held in memory.</p></div>
+<div class="paragraph"><p>The value of <em>ZMQ_SWAP</em> defines the maximum size of the swap space in bytes.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+int64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+bytes
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+0
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_affinity_retrieve_i_o_thread_affinity">ZMQ_AFFINITY: Retrieve I/O thread affinity</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_AFFINITY</em> option shall retrieve the I/O thread affinity for newly
+created connections on the specified <em>socket</em>.</p></div>
+<div class="paragraph"><p>Affinity determines which threads from the ØMQ I/O thread pool associated with
+the socket’s <em>context</em> shall handle newly created connections. A value of zero
+specifies no affinity, meaning that work shall be distributed fairly among all
+ØMQ I/O threads in the thread pool. For non-zero values, the lowest bit
+corresponds to thread 1, second lowest bit to thread 2 and so on. For example,
+a value of 3 specifies that subsequent connections on <em>socket</em> shall be handled
+exclusively by I/O threads 1 and 2.</p></div>
+<div class="paragraph"><p>See also <a href="zmq_init.html">zmq_init(3)</a> for details on allocating the number of I/O
+threads for a specific <em>context</em>.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+int64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+N/A (bitmap)
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+0
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+N/A
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_identity_retrieve_socket_identity">ZMQ_IDENTITY: Retrieve socket identity</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_IDENTITY</em> option shall retrieve the identity of the specified
+<em>socket</em>. Socket identity determines if existing ØMQ infastructure (<em>message
+queues</em>, <em>forwarding devices</em>) shall be identified with a specific application
+and persist across multiple runs of the application.</p></div>
+<div class="paragraph"><p>If the socket has no identity, each run of an application is completely
+separate from other runs. However, with identity set the socket shall re-use
+any existing ØMQ infrastructure configured by the previous run(s). Thus the
+application may receive messages that were sent in the meantime, <em>message
+queue</em> limits shall be shared with previous run(s) and so on.</p></div>
+<div class="paragraph"><p>Identity can be at least one byte and at most 255 bytes long. Identities
+starting with binary zero are reserved for use by ØMQ infrastructure.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+binary data
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+N/A
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+NULL
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_rate_retrieve_multicast_data_rate">ZMQ_RATE: Retrieve multicast data rate</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RATE</em> option shall retrieve the maximum send or receive data rate for
+multicast transports using the specified <em>socket</em>.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+uint64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+kilobits per second
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+100
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all, when using multicast transports
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_recovery_ivl_get_multicast_recovery_interval">ZMQ_RECOVERY_IVL: Get multicast recovery interval</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RECOVERY_IVL</em> option shall retrieve the recovery interval for
+multicast transports using the specified <em>socket</em>. The recovery interval
+determines the maximum time in seconds that a receiver can be absent from a
+multicast group before unrecoverable data loss will occur.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+uint64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+seconds
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+10
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all, when using multicast transports
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_mcast_loop_control_multicast_loopback">ZMQ_MCAST_LOOP: Control multicast loopback</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_MCAST_LOOP</em> option controls whether data sent via multicast
+transports can also be received by the sending host via loopback. A value of
+zero indicates that the loopback functionality is disabled, while the default
+value of 1 indicates that the loopback functionality is enabled. Leaving
+multicast loopback enabled when it is not required can have a negative impact
+on performance. Where possible, disable <em>ZMQ_MCAST_LOOP</em> in production
+environments.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+uint64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+boolean
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+1
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all, when using multicast transports
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_sndbuf_retrieve_kernel_transmit_buffer_size">ZMQ_SNDBUF: Retrieve kernel transmit buffer size</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_SNDBUF</em> option shall retrieve the underlying kernel transmit buffer
+size for the specified <em>socket</em>. A value of zero means that the OS default is
+in effect. For details refer to your operating system documentation for the
+<em>SO_SNDBUF</em> socket option.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+uint64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+bytes
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+0
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_rcvbuf_retrieve_kernel_receive_buffer_size">ZMQ_RCVBUF: Retrieve kernel receive buffer size</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RCVBUF</em> option shall retrieve the underlying kernel receive buffer
+size for the specified <em>socket</em>. A value of zero means that the OS default is
+in effect. For details refer to your operating system documentation for the
+<em>SO_RCVBUF</em> socket option.</p></div>
+<div class="hdlist"><table>
+<tr>
+<td class="hdlist1">
+Option value type
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+uint64_t
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Option value unit
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+bytes
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Default value
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+0
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+all
+</p>
+</td>
+</tr>
+</table></div>
+</div>
+<h2 id="_return_value">RETURN VALUE</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The <em>zmq_getsockopt()</em> function shall return zero if successful. Otherwise it
+shall return <tt>-1</tt> and set <em>errno</em> to one of the values defined below.</p></div>
+</div>
+<h2 id="_errors">ERRORS</h2>
+<div class="sectionbody">
+<div class="dlist"><dl>
+<dt class="hdlist1">
+<strong>EINVAL</strong>
+</dt>
+<dd>
+<p>
+The requested option <em>option_name</em> is unknown, or the requested <em>option_len</em> or
+<em>option_value</em> is invalid, or the size of the buffer pointed to by
+<em>option_value</em>, as specified by <em>option_len</em>, is insufficient for storing the
+option value.
+</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>
+</dl></div>
+</div>
+<h2 id="_example">EXAMPLE</h2>
+<div class="sectionbody">
+<div class="listingblock">
+<div class="title">Retrieving the high water mark</div>
+<div class="content">
+<pre><tt>/* Retrieve high water mark into hwm */
+int64_t hwm;
+rc = zmq_getsockopt (socket, ZMQ_HWM, &hwm, sizeof hwm);
+assert (rc == 0);</tt></pre>
+</div></div>
+</div>
+<h2 id="_see_also">SEE ALSO</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><a href="zmq_setsockopt.html">zmq_setsockopt(3)</a>
+<a href="zmq_socket.html">zmq_socket(3)</a>
+<a href="zmq.html">zmq(7)</a></p></div>
+</div>
+<h2 id="_authors">AUTHORS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The ØMQ documentation was written by Martin Sustrik <<a href="mailto:sustrik@250bpm.com">sustrik@250bpm.com</a>> and
+Martin Lucina <<a href="mailto:mato@kotelna.sk">mato@kotelna.sk</a>>.</p></div>
+</div>
+</div>
+<div id="footnotes"><hr /></div>
+<div id="footer">
+<div id="footer-text">
+Last updated 2010-06-03 14:13:06 CEST
+</div>
+</div>
+</body>
+</html>
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