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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">
-<div class="sect1">
-<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>
-</div>
-<div class="sect1">
-<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>
-<div class="sect2">
-<h3 id="_zmq_type_retrieve_socket_type">ZMQ_TYPE: Retrieve socket type</h3>
-<div class="paragraph"><p>The <em>ZMQ_TYPE</em> option shall retrieve the socket type for the specified
-<em>socket</em>. The socket type is specified at socket creation time and
-cannot be modified afterwards.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</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;">
-all
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_rcvmore_more_message_data_parts_to_follow">ZMQ_RCVMORE: More message data parts to follow</h3>
-<div class="paragraph"><p>The <em>ZMQ_RCVMORE</em> option shall return True (1) if the message part last
-received from the <em>socket</em> was a data part with more parts to follow. If there
-are no data parts to follow, this option shall return False (0).</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 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;">
-int
-</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>
-</div>
-<div class="sect2">
-<h3 id="_zmq_sndhwm_retrieves_high_water_mark_for_outbound_messages">ZMQ_SNDHWM: Retrieves high water mark for outbound messages</h3>
-<div class="paragraph"><p>The <em>ZMQ_SNDHWM</em> option shall return the high water mark for outbound messages
-on 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. A value of zero means no
-limit.</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="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</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;">
-1000
-</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>
-<div class="sect2">
-<h3 id="_zmq_rcvhwm_retrieve_high_water_mark_for_inbound_messages">ZMQ_RCVHWM: Retrieve high water mark for inbound messages</h3>
-<div class="paragraph"><p>The <em>ZMQ_RCVHWM</em> option shall return the high water mark for inbound messages on
-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. A value of zero means no
-limit.</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="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</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;">
-1000
-</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>
-<div class="sect2">
-<h3 id="_zmq_affinity_retrieve_i_o_thread_affinity">ZMQ_AFFINITY: Retrieve I/O thread affinity</h3>
-<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>
-</div>
-<div class="sect2">
-<h3 id="_zmq_identity_retrieve_socket_identity">ZMQ_IDENTITY: Retrieve socket identity</h3>
-<div class="paragraph"><p>The <em>ZMQ_IDENTITY</em> option shall retrieve the identity of the specified <em>socket</em>.
-Socket identity is used only by request/reply pattern. Namely, it can be used
-in tandem with ROUTER socket to route messages to the peer with specific
-identity.</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;">
-ZMQ_REP, ZMQ_REQ, ZMQ_ROUTER, ZMQ_DEALER.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_rate_retrieve_multicast_data_rate">ZMQ_RATE: Retrieve multicast data rate</h3>
-<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;">
-int
-</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>
-</div>
-<div class="sect2">
-<h3 id="_zmq_recovery_ivl_get_multicast_recovery_interval">ZMQ_RECOVERY_IVL: Get multicast recovery interval</h3>
-<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 milliseconds 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;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-milliseconds
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-10000
-</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>
-</div>
-<div class="sect2">
-<h3 id="_zmq_sndbuf_retrieve_kernel_transmit_buffer_size">ZMQ_SNDBUF: Retrieve kernel transmit buffer size</h3>
-<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;">
-int
-</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>
-<div class="sect2">
-<h3 id="_zmq_rcvbuf_retrieve_kernel_receive_buffer_size">ZMQ_RCVBUF: Retrieve kernel receive buffer size</h3>
-<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;">
-int
-</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>
-<div class="sect2">
-<h3 id="_zmq_linger_retrieve_linger_period_for_socket_shutdown">ZMQ_LINGER: Retrieve linger period for socket shutdown</h3>
-<div class="paragraph"><p>The <em>ZMQ_LINGER</em> option shall retrieve the linger period for the specified
-<em>socket</em>. The linger period determines how long pending messages which have
-yet to be sent to a peer shall linger in memory after a socket is closed with
-<a href="zmq_close.html">zmq_close(3)</a>, and further affects the termination of the socket’s
-context with <a href="zmq_term.html">zmq_term(3)</a>. The following outlines the different
-behaviours:</p></div>
-<div class="ulist"><ul>
-<li>
-<p>
-The default value of <em>-1</em> specifies an infinite linger period. Pending
- messages shall not be discarded after a call to <em>zmq_close()</em>; attempting to
- terminate the socket’s context with <em>zmq_term()</em> shall block until all
- pending messages have been sent to a peer.
-</p>
-</li>
-<li>
-<p>
-The value of <em>0</em> specifies no linger period. Pending messages shall be
- discarded immediately when the socket is closed with <em>zmq_close()</em>.
-</p>
-</li>
-<li>
-<p>
-Positive values specify an upper bound for the linger period in milliseconds.
- Pending messages shall not be discarded after a call to <em>zmq_close()</em>;
- attempting to terminate the socket’s context with <em>zmq_term()</em> shall block
- until either all pending messages have been sent to a peer, or the linger
- period expires, after which any pending messages shall be discarded.
-</p>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-milliseconds
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (infinite)
-</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>
-</li>
-</ul></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_reconnect_ivl_retrieve_reconnection_interval">ZMQ_RECONNECT_IVL: Retrieve reconnection interval</h3>
-<div class="paragraph"><p>The <em>ZMQ_RECONNECT_IVL</em> option shall retrieve the initial reconnection interval
-for the specified <em>socket</em>. The reconnection interval is the period ØMQ shall
-wait between attempts to reconnect disconnected peers when using
-connection-oriented transports. The value -1 means no reconnection.</p></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content">The reconnection interval may be randomized by ØMQ to prevent
-reconnection storms in topologies with a large number of peers per socket.</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;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-milliseconds
-</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, only for connection-oriented transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_reconnect_ivl_max_retrieve_maximum_reconnection_interval">ZMQ_RECONNECT_IVL_MAX: Retrieve maximum reconnection interval</h3>
-<div class="paragraph"><p>The <em>ZMQ_RECONNECT_IVL_MAX</em> option shall retrieve the maximum reconnection
-interval for the specified <em>socket</em>. This is the maximum period ØMQ shall wait
-between attempts to reconnect. On each reconnect attempt, the previous interval
-shall be doubled untill ZMQ_RECONNECT_IVL_MAX is reached. This allows for
-exponential backoff strategy. Default value means no exponential backoff is
-performed and reconnect interval calculations are only based on
-ZMQ_RECONNECT_IVL.</p></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content">Values less than ZMQ_RECONNECT_IVL will be ignored.</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;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-milliseconds
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-0 (only use ZMQ_RECONNECT_IVL)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, only for connection-oriented transport
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_backlog_retrieve_maximum_length_of_the_queue_of_outstanding_connections">ZMQ_BACKLOG: Retrieve maximum length of the queue of outstanding connections</h3>
-<div class="paragraph"><p>The <em>ZMQ_BACKLOG</em> option shall retrieve the maximum length of the queue of
-outstanding peer connections for the specified <em>socket</em>; this only applies to
-connection-oriented transports. For details refer to your operating system
-documentation for the <em>listen</em> function.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-connections
-</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, only for connection-oriented transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_maxmsgsize_maximum_acceptable_inbound_message_size">ZMQ_MAXMSGSIZE: Maximum acceptable inbound message size</h3>
-<div class="paragraph"><p>The option shall retrieve limit for the inbound messages. If a peer sends
-a message larger than ZMQ_MAXMSGSIZE it is disconnected. Value of -1 means
-<em>no limit</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;">
-bytes
-</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
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_multicast_hops_maximum_network_hops_for_multicast_packets">ZMQ_MULTICAST_HOPS: Maximum network hops for multicast packets</h3>
-<div class="paragraph"><p>The option shall retrieve time-to-live used for outbound multicast packets.
-The default of 1 means that the multicast packets don’t leave the local network.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-network hops
-</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>
-</div>
-<div class="sect2">
-<h3 id="_zmq_rcvtimeo_maximum_time_before_a_socket_operation_returns_with_eagain">ZMQ_RCVTIMEO: Maximum time before a socket operation returns with EAGAIN</h3>
-<div class="paragraph"><p>Retrieve the timeout for recv operation on the socket. If the value is <tt>0</tt>,
-<em>zmq_recv(3)</em> will return immediately, with a EAGAIN error if there is no
-message to receive. If the value is <tt>-1</tt>, it will block until a message is
-available. For all other values, it will wait for a message for that amount
-of time before returning with an EAGAIN error.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-milliseconds
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (infinite)
-</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>
-<div class="sect2">
-<h3 id="_zmq_sndtimeo_maximum_time_before_a_socket_operation_returns_with_eagain">ZMQ_SNDTIMEO: Maximum time before a socket operation returns with EAGAIN</h3>
-<div class="paragraph"><p>Retrieve the timeout for send operation on the socket. If the value is <tt>0</tt>,
-<em>zmq_send(3)</em> will return immediately, with a EAGAIN error if the message
-cannot be sent. If the value is <tt>-1</tt>, it will block until the message is sent.
-For all other values, it will try to send the message for that amount of time
-before returning with an EAGAIN error.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-milliseconds
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (infinite)
-</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>
-<div class="sect2">
-<h3 id="_zmq_ipv6_retrieve_ipv6_socket_status">ZMQ_IPV6: Retrieve IPv6 socket status</h3>
-<div class="paragraph"><p>Retrieve the IPv6 option for the socket. A value of <tt>1</tt> means IPv6 is
-enabled on the socket, while <tt>0</tt> means the socket will use only IPv4.
-When IPv6 is enabled the socket will connect to, or accept connections
-from, both IPv4 and IPv6 hosts.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</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;">
-0 (false)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_ipv4only_retrieve_ipv4_only_socket_override_status">ZMQ_IPV4ONLY: Retrieve IPv4-only socket override status</h3>
-<div class="paragraph"><p>Retrieve the IPv4-only option for the socket. This option is deprecated.
-Please use the ZMQ_IPV6 option.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</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 (true)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_immediate_retrieve_attach_on_connect_value">ZMQ_IMMEDIATE: Retrieve attach-on-connect value</h3>
-<div class="paragraph"><p>Retrieve the state of the attach on connect value. If set to <tt>1</tt>, will delay the
-attachment of a pipe on connect until the underlying connection has completed.
-This will cause the socket to block if there are no other connections, but will
-prevent queues from filling on pipes awaiting connection.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</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;">
-0 (false)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, primarily when using TCP/IPC transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_fd_retrieve_file_descriptor_associated_with_the_socket">ZMQ_FD: Retrieve file descriptor associated with the socket</h3>
-<div class="paragraph"><p>The <em>ZMQ_FD</em> option shall retrieve the file descriptor associated with the
-specified <em>socket</em>. The returned file descriptor can be used to integrate the
-socket into an existing event loop; the ØMQ library shall signal any pending
-events on the socket in an <em>edge-triggered</em> fashion by making the file
-descriptor become ready for reading.</p></div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content">The ability to read from the returned file descriptor does not
-necessarily indicate that messages are available to be read from, or can be
-written to, the underlying socket; applications must retrieve the actual event
-state with a subsequent retrieval of the <em>ZMQ_EVENTS</em> option.</td>
-</tr></table>
-</div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Note</div>
-</td>
-<td class="content">The returned file descriptor is also used internally by the <em>zmq_send</em>
-and <em>zmq_recv</em> functions. As the descriptor is edge triggered, applications
-must update the state of <em>ZMQ_EVENTS</em> after each invocation of <em>zmq_send</em>
-or <em>zmq_recv</em>.To be more explicit: after calling <em>zmq_send</em> the socket may
-become readable (and vice versa) without triggering a read event on the
-file descriptor.</td>
-</tr></table>
-</div>
-<div class="admonitionblock">
-<table><tr>
-<td class="icon">
-<div class="title">Caution</div>
-</td>
-<td class="content">The returned file descriptor is intended for use with a <em>poll</em> or
-similar system call only. Applications must never attempt to read or write data
-to it directly, neither should they try to close it.</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;">
-int on POSIX systems, SOCKET on Windows
-</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;">
-all
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_events_retrieve_socket_event_state">ZMQ_EVENTS: Retrieve socket event state</h3>
-<div class="paragraph"><p>The <em>ZMQ_EVENTS</em> option shall retrieve the event state for the specified
-<em>socket</em>. The returned value is a bit mask constructed by OR’ing a combination
-of the following event flags:</p></div>
-<div class="dlist"><dl>
-<dt class="hdlist1">
-<strong>ZMQ_POLLIN</strong>
-</dt>
-<dd>
-<p>
-Indicates that at least one message may be received from the specified socket
-without blocking.
-</p>
-</dd>
-<dt class="hdlist1">
-<strong>ZMQ_POLLOUT</strong>
-</dt>
-<dd>
-<p>
-Indicates that at least one message may be sent to the specified socket without
-blocking.
-</p>
-</dd>
-</dl></div>
-<div class="paragraph"><p>The combination of a file descriptor returned by the <em>ZMQ_FD</em> option being
-ready for reading but no actual events returned by a subsequent retrieval of
-the <em>ZMQ_EVENTS</em> option is valid; applications should simply ignore this case
-and restart their polling operation/event loop.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-N/A (flags)
-</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>
-</div>
-<div class="sect2">
-<h3 id="_zmq_last_endpoint_retrieve_the_last_endpoint_set">ZMQ_LAST_ENDPOINT: Retrieve the last endpoint set</h3>
-<div class="paragraph"><p>The <em>ZMQ_LAST_ENDPOINT</em> option shall retrieve the last endpoint bound for
-TCP and IPC transports. The returned value will be a string in the form of
-a ZMQ DSN. Note that if the TCP host is INADDR_ANY, indicated by a *, then
-the returned address will be 0.0.0.0 (for IPv4).</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-NULL-terminated character string
-</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, when binding TCP or IPC transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_tcp_keepalive_override_so_keepalive_socket_option">ZMQ_TCP_KEEPALIVE: Override SO_KEEPALIVE socket option</h3>
-<div class="paragraph"><p>Override <em>SO_KEEPALIVE</em> socket option(where supported by OS).
-The default value of <tt>-1</tt> means to skip any overrides and leave it to OS default.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1,0,1
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (leave to OS default)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_tcp_keepalive_idle_override_tcp_keepcnt_or_tcp_keepalive_on_some_os">ZMQ_TCP_KEEPALIVE_IDLE: Override TCP_KEEPCNT(or TCP_KEEPALIVE on some OS)</h3>
-<div class="paragraph"><p>Override <em>TCP_KEEPCNT</em>(or <em>TCP_KEEPALIVE</em> on some OS) socket option (where
-supported by OS). The default value of <tt>-1</tt> means to skip any overrides and
-leave it to OS default.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1,>0
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (leave to OS default)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_tcp_keepalive_cnt_override_tcp_keepcnt_socket_option">ZMQ_TCP_KEEPALIVE_CNT: Override TCP_KEEPCNT socket option</h3>
-<div class="paragraph"><p>Override <em>TCP_KEEPCNT</em> socket option(where supported by OS).
-The default value of <tt>-1</tt> means to skip any overrides and leave it to OS default.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1,>0
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (leave to OS default)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_tcp_keepalive_intvl_override_tcp_keepintvl_socket_option">ZMQ_TCP_KEEPALIVE_INTVL: Override TCP_KEEPINTVL socket option</h3>
-<div class="paragraph"><p>Override <em>TCP_KEEPINTVL</em> socket option(where supported by OS).
-The default value of <tt>-1</tt> means to skip any overrides and leave it to OS default.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1,>0
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
--1 (leave to OS default)
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transports.
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_mechanism_retrieve_current_security_mechanism">ZMQ_MECHANISM: Retrieve current security mechanism</h3>
-<div class="paragraph"><p>The <em>ZMQ_MECHANISM</em> option shall retrieve the current security mechanism
-for the socket.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-ZMQ_NULL, ZMQ_PLAIN, or ZMQ_CURVE
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-ZMQ_NULL
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP or IPC transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_plain_server_retrieve_current_plain_server_role">ZMQ_PLAIN_SERVER: Retrieve current PLAIN server role</h3>
-<div class="paragraph"><p>Returns the <em>ZMQ_PLAIN_SERVER</em> option, if any, previously set on the socket.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value unit
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-0, 1
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Default value
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-int
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP or IPC transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_plain_username_retrieve_current_plain_username">ZMQ_PLAIN_USERNAME: Retrieve current PLAIN username</h3>
-<div class="paragraph"><p>The <em>ZMQ_PLAIN_USERNAME</em> option shall retrieve the last username set for
-the PLAIN security mechanism. The returned value shall be a NULL-terminated
-string and MAY be empty. The returned size SHALL include the terminating
-null byte.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-NULL-terminated character string
-</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 string
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP or IPC transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_plain_password_retrieve_current_password">ZMQ_PLAIN_PASSWORD: Retrieve current password</h3>
-<div class="paragraph"><p>The <em>ZMQ_PLAIN_PASSWORD</em> option shall retrieve the last password set for
-the PLAIN security mechanism. The returned value shall be a NULL-terminated
-string and MAY be empty. The returned size SHALL include the terminating
-null byte.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-NULL-terminated character string
-</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 string
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP or IPC transports
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_curve_publickey_retrieve_current_curve_public_key">ZMQ_CURVE_PUBLICKEY: Retrieve current CURVE public key</h3>
-<div class="paragraph"><p>Retrieves the current long term public key for the socket. You can
-provide either a 32 byte buffer, to retrieve the binary key value, or
-a 41 byte buffer, to retrieve the key in a printable Z85 format.
-NOTE: to fetch a printable key, the buffer must be 41 bytes large
-to hold the 40-char key value and one null byte.</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 or Z85 text string
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value size
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-32 or 41
-</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, when using TCP transport
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_curve_secretkey_retrieve_current_curve_secret_key">ZMQ_CURVE_SECRETKEY: Retrieve current CURVE secret key</h3>
-<div class="paragraph"><p>Retrieves the current long term secret key for the socket. You can
-provide either a 32 byte buffer, to retrieve the binary key value, or
-a 41 byte buffer, to retrieve the key in a printable Z85 format.</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 or Z85 text string
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value size
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-32 or 41
-</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, when using TCP transport
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_curve_serverkey_retrieve_current_curve_server_key">ZMQ_CURVE_SERVERKEY: Retrieve current CURVE server key</h3>
-<div class="paragraph"><p>Retrieves the current server key for the client socket. You can
-provide either a 32 byte buffer, to retrieve the binary key value, or
-a 40 byte buffer, to retrieve the key in a printable Z85 format.</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 or Z85 text string
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Option value size
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-32 or 41
-</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, when using TCP transport
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-<div class="sect2">
-<h3 id="_zmq_zap_domain_retrieve_rfc_27_authentication_domain">ZMQ_ZAP_DOMAIN: Retrieve RFC 27 authentication domain</h3>
-<div class="paragraph"><p>The <em>ZMQ_ZAP_DOMAIN</em> option shall retrieve the last ZAP domain set for
-the socket. The returned value shall be a NULL-terminated string and MAY
-be empty. The returned size SHALL include the terminating null byte.</p></div>
-<div class="hdlist"><table>
-<tr>
-<td class="hdlist1">
-Option value type
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-character string
-</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;">
-not set
-</p>
-</td>
-</tr>
-<tr>
-<td class="hdlist1">
-Applicable socket types
-<br />
-</td>
-<td class="hdlist2">
-<p style="margin-top: 0;">
-all, when using TCP transport
-</p>
-</td>
-</tr>
-</table></div>
-</div>
-</div>
-</div>
-<div class="sect1">
-<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>
-</div>
-<div class="sect1">
-<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>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.
-</p>
-</dd>
-</dl></div>
-</div>
-</div>
-<div class="sect1">
-<h2 id="_example">EXAMPLE</h2>
-<div class="sectionbody">
-<div class="listingblock">
-<div class="title">Retrieving the high water mark for outgoing messages</div>
-<div class="content">
-<pre><tt>/* Retrieve high water mark into sndhwm */
-int sndhwm;
-size_t sndhwm_size = sizeof (sndhwm);
-rc = zmq_getsockopt (socket, ZMQ_SNDHWM, &sndhwm, &sndhwm_size);
-assert (rc == 0);</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_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>
-</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 18:57:50 CET
-</div>
-</div>
-</body>
-</html>
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