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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;">
 -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_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;">
 -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_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;">
 -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_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;">
 -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 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;">
 -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_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 />
 | 
