4db94043cb
Files correlati : Commento : Spostamento in libraries delle librerie esterne di Campo per una maggiore pulizia e organizzazione git-svn-id: svn://10.65.10.50/branches/R_10_00@24150 c028cbd2-c16b-5b4b-a496-9718f37d4682
2685 lines
58 KiB
HTML
2685 lines
58 KiB
HTML
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</head>
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<body class="manpage">
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<div id="header">
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<h1>
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zmq_getsockopt(3) Manual Page
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</h1>
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<h2>NAME</h2>
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<div class="sectionbody">
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<p>zmq_getsockopt -
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get 0MQ socket options
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</p>
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</div>
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</div>
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<div id="content">
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<div class="sect1">
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<h2 id="_synopsis">SYNOPSIS</h2>
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<div class="sectionbody">
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<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>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_description">DESCRIPTION</h2>
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<div class="sectionbody">
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<div class="paragraph"><p>The <em>zmq_getsockopt()</em> function shall retrieve the value for the option
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specified by the <em>option_name</em> argument for the ØMQ socket pointed to by the
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<em>socket</em> argument, and store it in the buffer pointed to by the <em>option_value</em>
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argument. The <em>option_len</em> argument is the size in bytes of the buffer pointed
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to by <em>option_value</em>; upon successful completion <em>zmq_getsockopt()</em> shall
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modify the <em>option_len</em> argument to indicate the actual size of the option
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value stored in the buffer.</p></div>
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<div class="paragraph"><p>The following options can be retrieved with the <em>zmq_getsockopt()</em> function:</p></div>
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<div class="sect2">
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<h3 id="_zmq_type_retrieve_socket_type">ZMQ_TYPE: Retrieve socket type</h3>
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<div class="paragraph"><p>The <em>ZMQ_TYPE</em> option shall retrieve the socket type for the specified
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<em>socket</em>. The socket type is specified at socket creation time and
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cannot be modified afterwards.</p></div>
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<div class="hdlist"><table>
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<tr>
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<td class="hdlist1">
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Option value type
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<br />
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</td>
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<td class="hdlist2">
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<p style="margin-top: 0;">
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int
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</p>
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</td>
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</tr>
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<tr>
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<td class="hdlist1">
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Option value unit
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<br />
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</td>
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|
<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 12:57:50 EST
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|