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+<div id="header">
+<h1>
+zmq_ctx_socket_monitor(3) Manual Page
+</h1>
+<h2>NAME</h2>
+<div class="sectionbody">
+<p>zmq_socket_monitor -
+ register a monitoring callback
+</p>
+</div>
+</div>
+<div id="content">
+<div class="sect1">
+<h2 id="_synopsis">SYNOPSIS</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><strong>int zmq_socket_monitor (void <em>*socket</em>, char * <em>*addr</em>, int <em>events</em>);</strong></p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">DESCRIPTION</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The <em>zmq_socket_monitor()</em> function shall spawn a <em>PAIR</em> socket that publishes
+socket state changes (events) over the inproc:// transport to a given endpoint.</p></div>
+<div class="paragraph"><p>Messages consist of 2 Frames, the first containing the event-id and the
+associated value. The second frame holds the affected endpoint as string.</p></div>
+<div class="paragraph"><p>The layout of the first Frame is:
+ 16 bit event id
+ 32 bit event value</p></div>
+<div class="paragraph"><p>event id and value are in the native byte order (for the machine the
+application is running on). There is no padding between the fields.</p></div>
+<div class="paragraph"><p>The event value has to be interpreted in the context of the event id.
+See <em>Supported events</em> below for details.</p></div>
+<div class="listingblock">
+<div class="content">
+<pre><tt>Only connection oriented (tcp and ipc) transports are supported in this initial
+implementation.</tt></pre>
+</div></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_supported_events">Supported events</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="_zmq_event_connected_connection_established">ZMQ_EVENT_CONNECTED: connection established</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_CONNECTED</em> event triggers when a connection has been established
+to a remote peer. This can happen either synchronous or asynchronous.
+Value is the FD of the newly connected socket.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_connect_delayed_synchronous_connect_failed_it_8217_s_being_polled">ZMQ_EVENT_CONNECT_DELAYED: synchronous connect failed, it’s being polled</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_CONNECT_DELAYED</em> event triggers when an immediate connection
+attempt is delayed and its completion is being polled for.
+Value has no meaning.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_connect_retried_asynchronous_connect_reconnection_attempt">ZMQ_EVENT_CONNECT_RETRIED: asynchronous connect / reconnection attempt</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_CONNECT_RETRIED</em> event triggers when a connection attempt
+is being handled by reconnect timer. The reconnect interval’s recomputed
+for each attempt.
+Value is the reconnect interval.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_listening_socket_bound_to_an_address_ready_to_accept_connections">ZMQ_EVENT_LISTENING: socket bound to an address, ready to accept connections</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_LISTENING</em> event triggers when a socket’s successfully bound
+to a an interface.
+Value is the FD of the newly bound socket.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_bind_failed_socket_could_not_bind_to_an_address">ZMQ_EVENT_BIND_FAILED: socket could not bind to an address</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_BIND_FAILED</em> event triggers when a socket could not bind to
+a given interface.
+Value is the errno generated by the bind call.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_accepted_connection_accepted_to_bound_interface">ZMQ_EVENT_ACCEPTED: connection accepted to bound interface</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_ACCEPTED</em> event triggers when a connection from a remote peer
+has been established with a socket’s listen address.
+Value is the FD of the accepted socket.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_accept_failed_could_not_accept_client_connection">ZMQ_EVENT_ACCEPT_FAILED: could not accept client connection</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_ACCEPT_FAILED</em> event triggers when a connection attempt to
+a socket’s bound address fails.
+Value is the errno generated by accept.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_closed_connection_closed">ZMQ_EVENT_CLOSED: connection closed</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_CLOSED</em> event triggers when a connection’s underlying descriptor
+has been closed.
+Value is the former FD of the for the closed socket. FD has been closed already!</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_close_failed_connection_couldn_8217_t_be_closed">ZMQ_EVENT_CLOSE_FAILED: connection couldn’t be closed</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_CLOSE_FAILED</em> event triggers when a descriptor could not be
+released back to the OS. Implementation note: ONLY FOR IPC SOCKETS.
+Value is the errno generated by unlink.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_zmq_event_disconnected_broken_session">ZMQ_EVENT_DISCONNECTED: broken session</h3>
+<div class="paragraph"><p>The <em>ZMQ_EVENT_DISCONNECTED</em> event triggers when the stream engine (tcp and ipc
+specific) detects a corrupted / broken session.
+Value is the FD of the socket.</p></div>
+</div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_return_value">RETURN VALUE</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The <em>zmq_socket_monitor()</em> function returns a value of 0 or greater if
+successful. Otherwise it returns <tt>-1</tt> and sets <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>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>EPROTONOSUPPORT</strong>
+</dt>
+<dd>
+<p>
+The requested <em>transport</em> protocol is not supported. Monitor sockets are
+required to use the inproc:// transport.
+</p>
+</dd>
+<dt class="hdlist1">
+<strong>EINVAL</strong>
+</dt>
+<dd>
+<p>
+The endpoint supplied is invalid.
+</p>
+</dd>
+</dl></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_example">EXAMPLE</h2>
+<div class="sectionbody">
+<div class="listingblock">
+<div class="title">Observing a <em>REP</em> socket’s connection state</div>
+<div class="content">
+<pre><tt>#include <stdio.h>
+#include <zmq.h>
+#include <pthread.h>
+#include <string.h>
+#include <assert.h>
+
+static int read_msg(void* s, zmq_event_t* event, char* ep)
+{
+ int rc ;
+ zmq_msg_t msg1; // binary part
+ zmq_msg_init (&msg1);
+ zmq_msg_t msg2; // address part
+ zmq_msg_init (&msg2);
+ rc = zmq_msg_recv (&msg1, s, 0);
+ if (rc == -1 && zmq_errno() == ETERM)
+ return 1 ;
+ assert (rc != -1);
+ assert (zmq_msg_more(&msg1) != 0);
+ rc = zmq_msg_recv (&msg2, s, 0);
+ if (rc == -1 && zmq_errno() == ETERM)
+ return 1;
+ assert (rc != -1);
+ assert (zmq_msg_more(&msg2) == 0);
+ // copy binary data to event struct
+ const char* data = (char*)zmq_msg_data(&msg1);
+ memcpy(&(event->event), data, sizeof(event->event));
+ memcpy(&(event->value), data+sizeof(event->event), sizeof(event->value));
+ // copy address part
+ const size_t len = zmq_msg_size(&msg2) ;
+ ep = memcpy(ep, zmq_msg_data(&msg2), len);
+ *(ep + len) = 0 ;
+ return 0 ;
+}
+
+// REP socket monitor thread
+static void *rep_socket_monitor (void *ctx)
+{
+ zmq_event_t event;
+ static char addr[1025] ;
+ int rc;
+
+ printf("starting monitor...\n");
+
+ void *s = zmq_socket (ctx, ZMQ_PAIR);
+ assert (s);
+
+ rc = zmq_connect (s, "inproc://monitor.rep");
+ assert (rc == 0);
+ while (!read_msg(s, &event, addr)) {
+ switch (event.event) {
+ case ZMQ_EVENT_LISTENING:
+ printf ("listening socket descriptor %d\n", event.value);
+ printf ("listening socket address %s\n", addr);
+ break;
+ case ZMQ_EVENT_ACCEPTED:
+ printf ("accepted socket descriptor %d\n", event.value);
+ printf ("accepted socket address %s\n", addr);
+ break;
+ case ZMQ_EVENT_CLOSE_FAILED:
+ printf ("socket close failure error code %d\n", event.value);
+ printf ("socket address %s\n", addr);
+ break;
+ case ZMQ_EVENT_CLOSED:
+ printf ("closed socket descriptor %d\n", event.value);
+ printf ("closed socket address %s\n", addr);
+ break;
+ case ZMQ_EVENT_DISCONNECTED:
+ printf ("disconnected socket descriptor %d\n", event.value);
+ printf ("disconnected socket address %s\n", addr);
+ break;
+ }
+ }
+ zmq_close (s);
+ return NULL;
+}
+
+
+int main()
+{
+ const char* addr = "tcp://127.0.0.1:6666" ;
+ pthread_t thread ;
+
+ // Create the infrastructure
+ void *ctx = zmq_init (1);
+ assert (ctx);
+
+ // REP socket
+ void* rep = zmq_socket (ctx, ZMQ_REP);
+ assert (rep);
+
+ // REP socket monitor, all events
+ int rc = zmq_socket_monitor (rep, "inproc://monitor.rep", ZMQ_EVENT_ALL);
+ assert (rc == 0);
+ rc = pthread_create (&thread, NULL, rep_socket_monitor, ctx);
+ assert (rc == 0);
+
+ rc = zmq_bind (rep, addr);
+ assert (rc == 0);
+
+ // Allow some time for event detection
+ zmq_sleep (1);
+
+ // Close the REP socket
+ rc = zmq_close (rep);
+ assert (rc == 0);
+
+ zmq_term (ctx);
+
+ return 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.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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