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</head>
<body class="manpage">
<div id="header">
<h1>libnng(3) Manual Page</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>libnng - nanomsg next generation library</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>cc</strong> [<em>flags</em>] <em>files</em> <strong>-lnng</strong> [<em>libraries</em>]</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <a href="nng.html">nng(7)</a> library provides a common messaging framework
intended to solve common communication problems in distributed applications.</p>
</div>
<div class="paragraph">
<p>It provides a C language API.</p>
</div>
<div class="sect2">
<h3 id="_common_functions">Common Functions</h3>
<div class="paragraph">
<p>The following common functions exist in <em>libnng</em>.</p>
</div>
<table class="tableblock frame-all grid-all spread">
<colgroup>
<col style="width: 20%;">
<col style="width: 80%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_alloc.html">nng_alloc(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">allocate memory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_dial.html">nng_dial(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">create and start a dialer</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_free.html">nng_free(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">free memory</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_strerror.html">nng_strerror(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">return an error description</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="_socket_functions">Socket Functions</h3>
<div class="paragraph">
<p>The following functions operate on sockets.</p>
</div>
<table class="tableblock frame-all grid-all spread">
<colgroup>
<col style="width: 20%;">
<col style="width: 80%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_close.html">nng_close(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">close a socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_closeall.html">nng_closeall(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">close all open sockets</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_dial.html">nng_dial(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">create and start a dialer</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_getopt.html">nng_getopt(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">get a socket option</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_listen.html">nng_listen(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">create and start a listener</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_recv.html">nng_recv(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">receive data</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_send.html">nng_send(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">send data</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_setopt.html">nng_setopt(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">set a socket option</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="_message_functions">Message Functions</h3>
<div class="paragraph">
<p>Applications desiring to use the richest part of <em>libnng</em> will want to
use the message API, where a message structure is passed between functions.
This API provides the most power support for zero-copy.</p>
</div>
<div class="paragraph">
<p>Messages are divided into a header and body, where the body generally carries
user-payload and the header carries protocol specific header information.
Most applications will only interact with the body.</p>
</div>
<table class="tableblock frame-all grid-all spread">
<colgroup>
<col style="width: 20%;">
<col style="width: 80%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_alloc.html">nng_msg_alloc(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">allocate a message</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_body.html">nng_msg_body(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">return the message body</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_free.html">nng_msg_free(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">free a message</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_header.html">nng_msg_header(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">return the message header</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_header_len.html">nng_msg_header_len(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">return the message header length</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_len.html">nng_msg_len(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">return the message body length</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_msg_realloc.html">nng_msg_realloc(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">reallocate a message</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_recv_msg.html">nng_recvmsg(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">receive a message</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_sendmsg.html">nng_sendmsg(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">send a message</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="_asynchronous_operations">Asynchronous Operations</h3>
<div class="paragraph">
<p>Most applications will interact with <em>nng</em> synchronously; that is that
functions such as <a href="nng_send.html">nng_send()</a> will block the calling
thread until the operation has completed.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
Synchronous operations which send messages may return before the
message has actually been received, or even transmitted. Instead, These
functions return as soon as the message was successfully queued for
delivery.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>Asynchronous operations behave differently. These operations are
initiated by the calling thread, but control returns immediately to
the calling thread. When the operation is subsequently completed (regardless
of whether this was successful or not), then a user supplied function
("callback") is executed.</p>
</div>
<div class="paragraph">
<p>A context structure, called an <em>aio</em>, is allocated and associated for
each asynchronous operation. Only a single asynchronous operation may
be associated with an <em>aio</em> at any time.</p>
</div>
<div class="paragraph">
<p>The following functions are used in the asynchronous model:</p>
</div>
<table class="tableblock frame-all grid-all spread">
<colgroup>
<col style="width: 20%;">
<col style="width: 80%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_alloc.html">nng_aio_alloc(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">allocate asynchronous I/O context</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_cancel.html">nng_aio_cancel(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">cancel asynchronous I/O operation</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_free.html">nng_aio_free(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">free asynchronous I/O context</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_get_msg.html">nng_aio_get_msg(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">get message from an asynchronous receive</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_result.html">nng_aio_result(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">return result from asynchronous operation</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_stop.html">nng_aio_stop(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">stop asynchronous I/O operation</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_wait.html">nng_aio_wait(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">wait for an asynchronous I/O operation</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_set_msg.html">nng_aio_set_msg(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">set message for an asynchronous send</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_aio_set_timeout.html">nng_aio_set_timeout(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">set timeout for an asynchronous send</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_recv_aio.html">nng_recv_aio(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">receive a message asynchronously</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_send_aio.html">nng_send_aio(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">send a message asynchronously</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="_protocols">Protocols</h3>
<div class="paragraph">
<p>The following functions are used to construct a socket with a specific
protocol:</p>
</div>
<table class="tableblock frame-all grid-all spread">
<colgroup>
<col style="width: 20%;">
<col style="width: 80%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_bus.html">nng_bus_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a bus socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_pair.html">nng_pair_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a pair socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_pub.html">nng_pub_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a pub socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_rep.html">nng_rep_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a rep socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_req.html">nng_req_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a req socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_respondent.html">nng_respondent_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a respondent socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_sub.html">nng_sub_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a sub socket</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_surveyor.html">nng_surveyor_open(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">open a surveyor socket</p></td>
</tr>
</tbody>
</table>
</div>
<div class="sect2">
<h3 id="_transports">Transports</h3>
<div class="paragraph">
<p>The following functions are used to register a transport for use.</p>
</div>
<table class="tableblock frame-all grid-all spread">
<colgroup>
<col style="width: 20%;">
<col style="width: 80%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_inproc.html">nng_inproc_register(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">register inproc transport</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_ipc.html">nng_ipc_register(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">register IPC transport</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_tcp.html">nng_tcp_register(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">register TCP transport</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="nng_zerotier.html">nng_zerotier_register(3)</a></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">register ZeroTier transport</p></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="nng.html">nng(7)</a>
<a href="nng_compat.html">nng_compat(3)</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_copyright">COPYRIGHT</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright 2017 <a href="mailto:garrett@damore.org">Garrett D’Amore</a><br>
Copyright 2017 <a href="mailto:info@capitar.com">Capitar IT Group BV</a></p>
</div>
<div class="paragraph">
<p>This document is supplied under the terms of the
<a href="https://opensource.org/licenses/LICENSE.txt">MIT License</a>.</p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
nng 0.0.0<br>
Last updated 2017-12-12 11:42:26 UTC
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