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+<div id="header">
+<h1>
+zmq_setsockopt(3) Manual Page
+</h1>
+<h2>NAME</h2>
+<div class="sectionbody">
+<p>zmq_setsockopt -
+ set 0MQ socket options
+</p>
+</div>
+</div>
+<div id="content">
+<h2 id="_synopsis">SYNOPSIS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><strong>int zmq_setsockopt (void <em>*socket</em>, int <em>option_name</em>, const 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_setsockopt()</em> function shall set the option specified by the
+<em>option_name</em> argument to the value pointed to by the <em>option_value</em> argument
+for the ØMQ socket pointed to by the <em>socket</em> argument. The <em>option_len</em>
+argument is the size of the option value in bytes.</p></div>
+<div class="paragraph"><p>The following socket options can be set with the <em>zmq_setsockopt()</em> function:</p></div>
+<h3 id="_zmq_hwm_set_high_water_mark">ZMQ_HWM: Set high water mark</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_HWM</em> option shall set 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_set_disk_offload_size">ZMQ_SWAP: Set disk offload size</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_SWAP</em> option shall set 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_set_i_o_thread_affinity">ZMQ_AFFINITY: Set I/O thread affinity</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_AFFINITY</em> option shall set 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_set_socket_identity">ZMQ_IDENTITY: Set socket identity</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_IDENTITY</em> option shall set 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 should 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_subscribe_establish_message_filter">ZMQ_SUBSCRIBE: Establish message filter</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_SUBSCRIBE</em> option shall establish a new message filter on a <em>ZMQ_SUB</em>
+socket. Newly created <em>ZMQ_SUB</em> sockets shall filter out all incoming messages,
+therefore you should call this option to establish an initial message filter.</p></div>
+<div class="paragraph"><p>An empty <em>option_value</em> of length zero shall subscribe to all incoming
+messages. A non-empty <em>option_value</em> shall subscribe to all messages beginning
+with the specified prefix. Mutiple filters may be attached to a single
+<em>ZMQ_SUB</em> socket, in which case a message shall be accepted if it matches at
+least one filter.</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;">
+N/A
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+ZMQ_SUB
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_unsubscribe_remove_message_filter">ZMQ_UNSUBSCRIBE: Remove message filter</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_UNSUBSCRIBE</em> option shall remove an existing message filter on a
+<em>ZMQ_SUB</em> socket. The filter specified must match an existing filter previously
+established with the <em>ZMQ_SUBSCRIBE</em> option. If the socket has several
+instances of the same filter attached the <em>ZMQ_UNSUBSCRIBE</em> option shall remove
+only one instance, leaving the rest in place and functional.</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;">
+N/A
+</p>
+</td>
+</tr>
+<tr>
+<td class="hdlist1">
+Applicable socket types
+<br />
+</td>
+<td class="hdlist2">
+<p style="margin-top: 0;">
+ZMQ_SUB
+</p>
+</td>
+</tr>
+</table></div>
+<h3 id="_zmq_rate_set_multicast_data_rate">ZMQ_RATE: Set multicast data rate</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RATE</em> option shall set the maximum send or receive data rate for
+multicast transports such as <a href="zmq_pgm.html">zmq_pgm(7)</a> 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_set_multicast_recovery_interval">ZMQ_RECOVERY_IVL: Set multicast recovery interval</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RECOVERY_IVL</em> option shall set 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="admonitionblock">
+<table><tr>
+<td class="icon">
+<div class="title">Caution</div>
+</td>
+<td class="content">Excersize care when setting large recovery intervals as the data
+needed for recovery will be held in memory. For example, a 1 minute recovery
+interval at a data rate of 1Gbps requires a 7GB in-memory buffer.</td>
+</tr></table>
+</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 shall control whether data sent via multicast
+transports using the specified <em>socket</em> can also be received by the sending
+host via loopback. A value of zero disables the loopback functionality, while
+the default value of 1 enables the loopback functionality. 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_set_kernel_transmit_buffer_size">ZMQ_SNDBUF: Set kernel transmit buffer size</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_SNDBUF</em> option shall set the underlying kernel transmit buffer size
+for the <em>socket</em> to the specified size in bytes. A value of zero means leave
+the OS default unchanged. For details please 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_set_kernel_receive_buffer_size">ZMQ_RCVBUF: Set kernel receive buffer size</h3><div style="clear:left"></div>
+<div class="paragraph"><p>The <em>ZMQ_RCVBUF</em> option shall set the underlying kernel receive buffer size for
+the <em>socket</em> to the specified size in bytes. A value of zero means leave the
+OS default unchanged. 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_setsockopt()</em> |