blob: 4b897b5bad62bf7297cb1e7f0afd83980d33006b [file] [log] [blame]
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="Asciidoctor 1.5.4">
<title>nn_pubsub(7)</title>
<style>
/*! normalize.css v2.1.2 | MIT License | git.io/normalize */
/* ========================================================================== HTML5 display definitions ========================================================================== */
/** Correct `block` display not defined in IE 8/9. */
article, aside, details, figcaption, figure, footer, header, hgroup, main, nav, section, summary { display: block; }
/** Correct `inline-block` display not defined in IE 8/9. */
audio, canvas, video { display: inline-block; }
/** Prevent modern browsers from displaying `audio` without controls. Remove excess height in iOS 5 devices. */
audio:not([controls]) { display: none; height: 0; }
/** Address `[hidden]` styling not present in IE 8/9. Hide the `template` element in IE, Safari, and Firefox < 22. */
[hidden], template { display: none; }
script { display: none !important; }
/* ========================================================================== Base ========================================================================== */
/** 1. Set default font family to sans-serif. 2. Prevent iOS text size adjust after orientation change, without disabling user zoom. */
html { font-family: sans-serif; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */ }
/** Remove default margin. */
body { margin: 0; }
/* ========================================================================== Links ========================================================================== */
/** Remove the gray background color from active links in IE 10. */
a { background: transparent; }
/** Address `outline` inconsistency between Chrome and other browsers. */
a:focus { outline: thin dotted; }
/** Improve readability when focused and also mouse hovered in all browsers. */
a:active, a:hover { outline: 0; }
/* ========================================================================== Typography ========================================================================== */
/** Address variable `h1` font-size and margin within `section` and `article` contexts in Firefox 4+, Safari 5, and Chrome. */
h1 { font-size: 2em; margin: 0.67em 0; }
/** Address styling not present in IE 8/9, Safari 5, and Chrome. */
abbr[title] { border-bottom: 1px dotted; }
/** Address style set to `bolder` in Firefox 4+, Safari 5, and Chrome. */
b, strong { font-weight: bold; }
/** Address styling not present in Safari 5 and Chrome. */
dfn { font-style: italic; }
/** Address differences between Firefox and other browsers. */
hr { -moz-box-sizing: content-box; box-sizing: content-box; height: 0; }
/** Address styling not present in IE 8/9. */
mark { background: #ff0; color: #000; }
/** Correct font family set oddly in Safari 5 and Chrome. */
code, kbd, pre, samp { font-family: monospace, serif; font-size: 1em; }
/** Improve readability of pre-formatted text in all browsers. */
pre { white-space: pre-wrap; }
/** Set consistent quote types. */
q { quotes: "\201C" "\201D" "\2018" "\2019"; }
/** Address inconsistent and variable font size in all browsers. */
small { font-size: 80%; }
/** Prevent `sub` and `sup` affecting `line-height` in all browsers. */
sub, sup { font-size: 75%; line-height: 0; position: relative; vertical-align: baseline; }
sup { top: -0.5em; }
sub { bottom: -0.25em; }
/* ========================================================================== Embedded content ========================================================================== */
/** Remove border when inside `a` element in IE 8/9. */
img { border: 0; }
/** Correct overflow displayed oddly in IE 9. */
svg:not(:root) { overflow: hidden; }
/* ========================================================================== Figures ========================================================================== */
/** Address margin not present in IE 8/9 and Safari 5. */
figure { margin: 0; }
/* ========================================================================== Forms ========================================================================== */
/** Define consistent border, margin, and padding. */
fieldset { border: 1px solid #c0c0c0; margin: 0 2px; padding: 0.35em 0.625em 0.75em; }
/** 1. Correct `color` not being inherited in IE 8/9. 2. Remove padding so people aren't caught out if they zero out fieldsets. */
legend { border: 0; /* 1 */ padding: 0; /* 2 */ }
/** 1. Correct font family not being inherited in all browsers. 2. Correct font size not being inherited in all browsers. 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome. */
button, input, select, textarea { font-family: inherit; /* 1 */ font-size: 100%; /* 2 */ margin: 0; /* 3 */ }
/** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */
button, input { line-height: normal; }
/** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */
button, select { text-transform: none; }
/** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */
button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button; /* 2 */ cursor: pointer; /* 3 */ }
/** Re-set default cursor for disabled elements. */
button[disabled], html input[disabled] { cursor: default; }
/** 1. Address box sizing set to `content-box` in IE 8/9. 2. Remove excess padding in IE 8/9. */
input[type="checkbox"], input[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */ }
/** 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome. 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome (include `-moz` to future-proof). */
input[type="search"] { -webkit-appearance: textfield; /* 1 */ -moz-box-sizing: content-box; -webkit-box-sizing: content-box; /* 2 */ box-sizing: content-box; }
/** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */
input[type="search"]::-webkit-search-cancel-button, input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; }
/** Remove inner padding and border in Firefox 4+. */
button::-moz-focus-inner, input::-moz-focus-inner { border: 0; padding: 0; }
/** 1. Remove default vertical scrollbar in IE 8/9. 2. Improve readability and alignment in all browsers. */
textarea { overflow: auto; /* 1 */ vertical-align: top; /* 2 */ }
/* ========================================================================== Tables ========================================================================== */
/** Remove most spacing between table cells. */
table { border-collapse: collapse; border-spacing: 0; }
meta.foundation-mq-small { font-family: "only screen and (min-width: 768px)"; width: 768px; }
meta.foundation-mq-medium { font-family: "only screen and (min-width:1280px)"; width: 1280px; }
meta.foundation-mq-large { font-family: "only screen and (min-width:1440px)"; width: 1440px; }
*, *:before, *:after { -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; }
html, body { font-size: 100%; }
body { background: #fff; color: #222; padding: 0; margin: 0; font-family: "Helvetica Neue", "Helvetica", Helvetica, Arial, sans-serif; font-weight: normal; font-style: normal; line-height: 1; position: relative; cursor: auto; }
a:hover { cursor: pointer; }
img, object, embed { max-width: 100%; height: auto; }
object, embed { height: 100%; }
img { -ms-interpolation-mode: bicubic; }
#map_canvas img, #map_canvas embed, #map_canvas object, .map_canvas img, .map_canvas embed, .map_canvas object { max-width: none !important; }
.left { float: left !important; }
.right { float: right !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }
.text-center { text-align: center !important; }
.text-justify { text-align: justify !important; }
.hide { display: none; }
.antialiased, body { -webkit-font-smoothing: antialiased; }
img { display: inline-block; vertical-align: middle; }
textarea { height: auto; min-height: 50px; }
select { width: 100%; }
object, svg { display: inline-block; vertical-align: middle; }
.center { margin-left: auto; margin-right: auto; }
.spread { width: 100%; }
p.lead, .paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { font-size: 1.21875em; line-height: 1.6; }
.subheader, .admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { line-height: 1.4; color: #6c818f; font-weight: 300; margin-top: 0.2em; margin-bottom: 0.5em; }
/* Typography resets */
div, dl, dt, dd, ul, ol, li, h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6, pre, form, p, blockquote, th, td { margin: 0; padding: 0; direction: ltr; }
/* Default Link Styles */
a { color: #444; text-decoration: underline; line-height: inherit; }
a:hover, a:focus { color: #111; }
a img { border: none; }
/* Default paragraph styles */
p { font-family: inherit; font-weight: normal; font-size: 1em; line-height: 1.5; margin-bottom: 1.25em; text-rendering: optimizeLegibility; }
p aside { font-size: 0.875em; line-height: 1.35; font-style: italic; }
/* Default header styles */
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { font-family: ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, "Helvetica Neue", sans-serif; font-weight: bold; font-style: normal; color: #465158; text-rendering: optimizeLegibility; margin-top: 1em; margin-bottom: 0.5em; line-height: 1.2125em; }
h1 small, h2 small, h3 small, #toctitle small, .sidebarblock > .content > .title small, h4 small, h5 small, h6 small { font-size: 60%; color: #909ea7; line-height: 0; }
h1 { font-size: 2.125em; }
h2 { font-size: 1.6875em; }
h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.375em; }
h4 { font-size: 1.125em; }
h5 { font-size: 1.125em; }
h6 { font-size: 1em; }
hr { border: solid #ddd; border-width: 1px 0 0; clear: both; margin: 1.25em 0 1.1875em; height: 0; }
/* Helpful Typography Defaults */
em, i { font-style: italic; line-height: inherit; }
strong, b { font-weight: bold; line-height: inherit; }
small { font-size: 60%; line-height: inherit; }
code { font-family: "Consolas", "Deja Vu Sans Mono", "Bitstream Vera Sans Mono", monospace; font-weight: normal; color: #444; }
/* Lists */
ul, ol, dl { font-size: 1em; line-height: 1.5; margin-bottom: 1.25em; list-style-position: outside; font-family: inherit; }
ul, ol { margin-left: 0; }
ul.no-bullet, ol.no-bullet { margin-left: 0; }
/* Unordered Lists */
ul li ul, ul li ol { margin-left: 1.25em; margin-bottom: 0; font-size: 1em; /* Override nested font-size change */ }
ul.square li ul, ul.circle li ul, ul.disc li ul { list-style: inherit; }
ul.square { list-style-type: square; }
ul.circle { list-style-type: circle; }
ul.disc { list-style-type: disc; }
ul.no-bullet { list-style: none; }
/* Ordered Lists */
ol li ul, ol li ol { margin-left: 1.25em; margin-bottom: 0; }
/* Definition Lists */
dl dt { margin-bottom: 0.3em; font-weight: bold; }
dl dd { margin-bottom: 0.75em; }
/* Abbreviations */
abbr, acronym { text-transform: uppercase; font-size: 90%; color: #000; border-bottom: 1px dotted #ddd; cursor: help; }
abbr { text-transform: none; }
/* Blockquotes */
blockquote { margin: 0 0 1.25em; padding: 0.5625em 1.25em 0 1.1875em; border-left: 1px solid #ddd; }
blockquote cite { display: block; font-size: 0.8125em; color: #748590; }
blockquote cite:before { content: "\2014 \0020"; }
blockquote cite a, blockquote cite a:visited { color: #748590; }
blockquote, blockquote p { line-height: 1.5; color: #909ea7; }
/* Microformats */
.vcard { display: inline-block; margin: 0 0 1.25em 0; border: 1px solid #ddd; padding: 0.625em 0.75em; }
.vcard li { margin: 0; display: block; }
.vcard .fn { font-weight: bold; font-size: 0.9375em; }
.vevent .summary { font-weight: bold; }
.vevent abbr { cursor: auto; text-decoration: none; font-weight: bold; border: none; padding: 0 0.0625em; }
@media only screen and (min-width: 768px) { h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }
h1 { font-size: 2.75em; }
h2 { font-size: 2.3125em; }
h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.6875em; }
h4 { font-size: 1.4375em; } }
/* Tables */
table { background: #fff; margin-bottom: 1.25em; border: solid 0 #ddd; }
table thead, table tfoot { background: none; font-weight: bold; }
table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td { padding: 1px 8px 1px 5px; font-size: 1em; color: #222; text-align: left; }
table tr th, table tr td { padding: 1px 8px 1px 5px; font-size: 1em; color: #222; }
table tr.even, table tr.alt, table tr:nth-of-type(even) { background: none; }
table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td { display: table-cell; line-height: 1.5; }
body { tab-size: 4; }
h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; }
.clearfix:before, .clearfix:after, .float-group:before, .float-group:after { content: " "; display: table; }
.clearfix:after, .float-group:after { clear: both; }
*:not(pre) > code { font-size: 0.95em; font-style: normal !important; letter-spacing: 0; padding: 0; background-color: #f2f2f2; -webkit-border-radius: 6px; border-radius: 6px; line-height: inherit; }
pre, pre > code { line-height: 1.2; color: inherit; font-family: "Consolas", "Deja Vu Sans Mono", "Bitstream Vera Sans Mono", monospace; font-weight: normal; }
.keyseq { color: #333333; }
kbd { font-family: "Consolas", "Deja Vu Sans Mono", "Bitstream Vera Sans Mono", monospace; display: inline-block; color: #000; font-size: 0.65em; line-height: 1.45; background-color: #f7f7f7; border: 1px solid #ccc; -webkit-border-radius: 3px; border-radius: 3px; -moz-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; margin: 0 0.15em; padding: 0.2em 0.5em; vertical-align: middle; position: relative; top: -0.1em; white-space: nowrap; }
.keyseq kbd:first-child { margin-left: 0; }
.keyseq kbd:last-child { margin-right: 0; }
.menuseq, .menu { color: black; }
b.button:before, b.button:after { position: relative; top: -1px; font-weight: normal; }
b.button:before { content: "["; padding: 0 3px 0 2px; }
b.button:after { content: "]"; padding: 0 2px 0 3px; }
p a > code:hover { color: #373737; }
#header, #content, #footnotes, #footer { width: 100%; margin-left: auto; margin-right: auto; margin-top: 0; margin-bottom: 0; max-width: 62.5em; *zoom: 1; position: relative; padding-left: 0.9375em; padding-right: 0.9375em; }
#header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after { content: " "; display: table; }
#header:after, #content:after, #footnotes:after, #footer:after { clear: both; }
#content { margin-top: 1.25em; }
#content:before { content: none; }
#header > h1:first-child { color: #111; margin-top: 2.25rem; margin-bottom: 0; }
#header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #ddd; }
#header > h1:only-child, body.toc2 #header > h1:nth-last-child(2) { border-bottom: 1px solid #ddd; padding-bottom: 8px; }
#header .details { border-bottom: 1px solid #ddd; line-height: 1.45; padding-top: 0.25em; padding-bottom: 0.25em; padding-left: 0.25em; color: #748590; display: -ms-flexbox; display: -webkit-flex; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; }
#header .details span:first-child { margin-left: -0.125em; }
#header .details span.email a { color: #909ea7; }
#header .details br { display: none; }
#header .details br + span:before { content: "\00a0\2013\00a0"; }
#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #909ea7; }
#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
#header #revnumber { text-transform: capitalize; }
#header #revnumber:after { content: "\00a0"; }
#content > h1:first-child:not([class]) { color: #111; border-bottom: 1px solid #ddd; padding-bottom: 8px; margin-top: 0; padding-top: 1rem; margin-bottom: 1.25rem; }
#toc { border-bottom: 1px solid #ddd; padding-bottom: 0.5em; }
#toc > ul { margin-left: 0.125em; }
#toc ul.sectlevel0 > li > a { font-style: italic; }
#toc ul.sectlevel0 ul.sectlevel1 { margin: 0.5em 0; }
#toc ul { font-family: ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, "Helvetica Neue", sans-serif; list-style-type: none; }
#toc li { line-height: 1.3334; margin-top: 0.3334em; }
#toc a { text-decoration: none; }
#toc a:active { text-decoration: underline; }
#toctitle { color: #6c818f; font-size: 1.2em; }
@media only screen and (min-width: 768px) { #toctitle { font-size: 1.375em; }
body.toc2 { padding-left: 15em; padding-right: 0; }
#toc.toc2 { margin-top: 0 !important; background-color: #f2f2f2; position: fixed; width: 15em; left: 0; top: 0; border-right: 1px solid #ddd; border-top-width: 0 !important; border-bottom-width: 0 !important; z-index: 1000; padding: 1.25em 1em; height: 100%; overflow: auto; }
#toc.toc2 #toctitle { margin-top: 0; margin-bottom: 0.8rem; font-size: 1.2em; }
#toc.toc2 > ul { font-size: 0.9em; margin-bottom: 0; }
#toc.toc2 ul ul { margin-left: 0; padding-left: 1em; }
#toc.toc2 ul.sectlevel0 ul.sectlevel1 { padding-left: 0; margin-top: 0.5em; margin-bottom: 0.5em; }
body.toc2.toc-right { padding-left: 0; padding-right: 15em; }
body.toc2.toc-right #toc.toc2 { border-right-width: 0; border-left: 1px solid #ddd; left: auto; right: 0; } }
@media only screen and (min-width: 1280px) { body.toc2 { padding-left: 20em; padding-right: 0; }
#toc.toc2 { width: 20em; }
#toc.toc2 #toctitle { font-size: 1.375em; }
#toc.toc2 > ul { font-size: 0.95em; }
#toc.toc2 ul ul { padding-left: 1.25em; }
body.toc2.toc-right { padding-left: 0; padding-right: 20em; } }
#content #toc { border-style: solid; border-width: 1px; border-color: #d9d9d9; margin-bottom: 1.25em; padding: 1.25em; background: #f2f2f2; -webkit-border-radius: 6px; border-radius: 6px; }
#content #toc > :first-child { margin-top: 0; }
#content #toc > :last-child { margin-bottom: 0; }
#footer { max-width: 100%; background-color: #000; padding: 1.25em; }
#footer-text { color: white; line-height: 1.35; }
.sect1 { padding-bottom: 0.625em; }
@media only screen and (min-width: 768px) { .sect1 { padding-bottom: 1.25em; } }
.sect1 + .sect1 { border-top: 1px solid #ddd; }
#content h1 > a.anchor, h2 > a.anchor, h3 > a.anchor, #toctitle > a.anchor, .sidebarblock > .content > .title > a.anchor, h4 > a.anchor, h5 > a.anchor, h6 > a.anchor { position: absolute; z-index: 1001; width: 1.5ex; margin-left: -1.5ex; display: block; text-decoration: none !important; visibility: hidden; text-align: center; font-weight: normal; }
#content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before { content: "\00A7"; font-size: 0.85em; display: block; padding-top: 0.1em; }
#content h1:hover > a.anchor, #content h1 > a.anchor:hover, h2:hover > a.anchor, h2 > a.anchor:hover, h3:hover > a.anchor, #toctitle:hover > a.anchor, .sidebarblock > .content > .title:hover > a.anchor, h3 > a.anchor:hover, #toctitle > a.anchor:hover, .sidebarblock > .content > .title > a.anchor:hover, h4:hover > a.anchor, h4 > a.anchor:hover, h5:hover > a.anchor, h5 > a.anchor:hover, h6:hover > a.anchor, h6 > a.anchor:hover { visibility: visible; }
#content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link { color: #465158; text-decoration: none; }
#content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover { color: #3b444a; }
.audioblock, .imageblock, .literalblock, .listingblock, .stemblock, .videoblock { margin-bottom: 1.25em; }
.admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; }
table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; }
.paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: #111; }
table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; }
.admonitionblock > table { border-collapse: separate; border: 0; background: none; width: 100%; }
.admonitionblock > table td.icon { text-align: center; width: 80px; }
.admonitionblock > table td.icon img { max-width: none; }
.admonitionblock > table td.icon .title { font-weight: bold; font-family: ff-meta-web-pro-1, ff-meta-web-pro-2, Arial, "Helvetica Neue", sans-serif; text-transform: uppercase; }
.admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #ddd; color: #748590; }
.admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; }
.exampleblock > .content { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: #fff; -webkit-border-radius: 6px; border-radius: 6px; }
.exampleblock > .content > :first-child { margin-top: 0; }
.exampleblock > .content > :last-child { margin-bottom: 0; }
.sidebarblock { border-style: solid; border-width: 1px; border-color: #d9d9d9; margin-bottom: 1.25em; padding: 1.25em; background: #f2f2f2; -webkit-border-radius: 6px; border-radius: 6px; }
.sidebarblock > :first-child { margin-top: 0; }
.sidebarblock > :last-child { margin-bottom: 0; }
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</head>
<body class="manpage toc2 toc-left">
<div id="header">
<h1>nn_pubsub(7) Manual Page</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_synopsis">SYNOPSIS</a></li>
<li><a href="#_description">DESCRIPTION</a>
<ul class="sectlevel2">
<li><a href="#_socket_types">Socket Types</a></li>
<li><a href="#_socket_options">Socket Options</a></li>
<li><a href="#_example">EXAMPLE</a></li>
</ul>
</li>
<li><a href="#_see_also">SEE ALSO</a></li>
<li><a href="#_authors">AUTHORS</a></li>
</ul>
</div>
<h2>NAME</h2>
<div class="sectionbody">
<p>nn_pubsub - publish/subscribe scalability protocol</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><strong>#include &lt;nanomsg/nn.h&gt;</strong></p>
</div>
<div class="paragraph">
<p><strong>#include &lt;nanomsg/pubsub.h&gt;</strong></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Broadcasts messages to multiple destinations.</p>
</div>
<div class="paragraph">
<p>Messages are sent from NN_PUB sockets and will only be received by NN_SUB
sockets that have subscribed to the matching <em>topic</em>. Topic is an arbitrary
sequence of bytes at the beginning of the message body. The NN_SUB socket will
determine whether a message should be delivered to the user by comparing the
subscribed topics (using NN_SUB_SUBSCRIBE on a full SUB socket) to the bytes
initial bytes in the incoming message, up to the size of the topic.</p>
</div>
<div class="listingblock">
<div class="content">
<pre>nn_setsockopt (s, NN_SUB, NN_SUB_SUBSCRIBE, "Hello", 5);</pre>
</div>
</div>
<div class="paragraph">
<p>Will match any message with intial 5 bytes being "Hello", for example,
message "Hello, World!" will match.</p>
</div>
<div class="paragraph">
<p>Topic with zero length matches any message.</p>
</div>
<div class="paragraph">
<p>If the socket is subscribed to multiple topics, message matching any of them
will be delivered to the user.</p>
</div>
<div class="paragraph">
<p>Since the filtering is performed on the Subscriber side, all the messages
from Publisher will be sent over the transport layer.</p>
</div>
<div class="paragraph">
<p>The entire message, including the topic, is delivered to the user.</p>
</div>
<div class="sect2">
<h3 id="_socket_types">Socket Types</h3>
<div class="dlist">
<dl>
<dt class="hdlist1">NN_PUB</dt>
<dd>
<p>This socket is used to distribute messages to multiple destinations.
Receive operation is not defined.</p>
</dd>
<dt class="hdlist1">NN_SUB</dt>
<dd>
<p>Receives messages from the publisher. Only messages that the socket is
subscribed to are received. When the socket is created there are no
subscriptions and thus no messages will be received. Send operation is
not defined on this socket.</p>
</dd>
</dl>
</div>
</div>
<div class="sect2">
<h3 id="_socket_options">Socket Options</h3>
<div class="dlist">
<dl>
<dt class="hdlist1">NN_SUB_SUBSCRIBE</dt>
<dd>
<p>Defined on full SUB socket. Subscribes for a particular topic. Type of the
option is string. A single NN_SUB socket can handle multiple subscriptions.</p>
</dd>
<dt class="hdlist1">NN_SUB_UNSUBSCRIBE</dt>
<dd>
<p>Defined on full SUB socket. Unsubscribes from a particular topic. Type of
the option is string.</p>
</dd>
</dl>
</div>
</div>
<div class="sect2">
<h3 id="_example">EXAMPLE</h3>
<div class="listingblock">
<div class="content">
<pre>int pub = nn_socket (AF_SP, NN_PUB);
int sub = nn_socket (AF_SP, NN_SUB);
int nbytes;
void *buf = NULL;
nn_setsockopt (sub, NN_SUB, NN_SUB_SUBSCRIBE, "foo", 3);
nn_setsockopt (sub, NN_SUB, NN_SUB_SUBSCRIBE, "bar", 3);
nbytes = nn_send (pub, "foo|Hello!", 10);
assert(nbytes == 10);
nbytes = nn_recv (sub, &amp;buf, NN_MSG, 0);
assert (nbytes == 10);
nn_freemsg (buf);
nbytes = nn_send (pub, "baz|World!", 10);
/* Message is not delivered because if matches no subscription. */
nbytes = nn_recv(sub, &amp;buf, NN_MSG, 0);</pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="nn_bus.7.html">nn_bus(7)</a>
<a href="nn_reqrep.7.html">nn_reqrep(7)</a>
<a href="nn_pipeline.7.html">nn_pipeline(7)</a>
<a href="nn_survey.7.html">nn_survey(7)</a>
<a href="nn_pair.7.html">nn_pair(7)</a>
<a href="nanomsg.7.html">nanomsg(7)</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_authors">AUTHORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="mailto:sustrik@250bpm.com">Martin Sustrik</a></p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
nanomsg 0.8-beta-21-g327a29b-dirty<br>
Last updated 2016-04-15 11:01:53 PDT
</div>
</div>
</body>
</html>