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-<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_len</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;">
-uint64_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;">
-uint64_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;">
-int64_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;">
-int64_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;">
-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;">
-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>
-<dt class="hdlist1">
-<strong>EFAULT</strong>
-</dt>
-<dd>
-<p>
-The provided <em>socket</em> was not valid (NULL).
-</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;
-size_t hwm_size = sizeof (hwm);
-rc = zmq_getsockopt (socket, ZMQ_HWM, &hwm, &hwm_size);
-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="zm |