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
838 lines
22 KiB
HTML
838 lines
22 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_ctx_socket_monitor(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_socket_monitor -
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register a monitoring callback
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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_socket_monitor (void <em>*socket</em>, char * <em>*addr</em>, int <em>events</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_socket_monitor()</em> function shall spawn a <em>PAIR</em> socket that publishes
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socket state changes (events) over the inproc:// transport to a given endpoint.</p></div>
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<div class="paragraph"><p>Messages consist of 2 Frames, the first containing the event-id and the
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associated value. The second frame holds the affected endpoint as string.</p></div>
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<div class="paragraph"><p>The layout of the first Frame is:
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16 bit event id
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32 bit event value</p></div>
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<div class="paragraph"><p>event id and value are in the native byte order (for the machine the
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application is running on). There is no padding between the fields.</p></div>
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<div class="paragraph"><p>The event value has to be interpreted in the context of the event id.
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See <em>Supported events</em> below for details.</p></div>
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<div class="listingblock">
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<div class="content">
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<pre><tt>Only connection oriented (tcp and ipc) transports are supported in this initial
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implementation.</tt></pre>
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</div></div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_supported_events">Supported events</h2>
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<div class="sectionbody">
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<div class="sect2">
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<h3 id="_zmq_event_connected_connection_established">ZMQ_EVENT_CONNECTED: connection established</h3>
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<div class="paragraph"><p>The <em>ZMQ_EVENT_CONNECTED</em> event triggers when a connection has been established
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to a remote peer. This can happen either synchronous or asynchronous.
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Value is the FD of the newly connected socket.</p></div>
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</div>
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<div class="sect2">
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<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 12:57:50 EST
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|