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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>17 TCP: Unit and Signature</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">▼</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Net:<span class="mywbr"> </span> Networking Libraries</a></td></tr></table></div><div class="tocviewsublisttop" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="http-client.html" class="tocviewlink" data-pltdoc="x">HTTP Client</a></td></tr><tr><td align="right">2 </td><td><a href="url.html" class="tocviewlink" data-pltdoc="x">URLs and HTTP</a></td></tr><tr><td align="right">3 </td><td><a href="uri-codec.html" class="tocviewlink" data-pltdoc="x">URI Codec:<span class="mywbr"> </span> Encoding and Decoding URIs</a></td></tr><tr><td align="right">4 </td><td><a href="websocket.html" class="tocviewlink" data-pltdoc="x">Web<span class="mywbr"> </span>Socket</a></td></tr><tr><td align="right">5 </td><td><a href="ftp.html" class="tocviewlink" data-pltdoc="x">FTP:<span class="mywbr"> </span> Client</a></td></tr><tr><td align="right">6 </td><td><a href="sendurl.html" class="tocviewlink" data-pltdoc="x">Send URL:<span class="mywbr"> </span> Opening a Web Browser</a></td></tr><tr><td align="right">7 </td><td><a href="smtp.html" class="tocviewlink" data-pltdoc="x">SMTP:<span class="mywbr"> </span> Sending E-<wbr></wbr>Mail</a></td></tr><tr><td align="right">8 </td><td><a href="sendmail.html" class="tocviewlink" data-pltdoc="x"><span class="stt">sendmail</span>:<span class="mywbr"> </span> Sending E-<wbr></wbr>Mail</a></td></tr><tr><td align="right">9 </td><td><a href="head.html" class="tocviewlink" data-pltdoc="x">Headers:<span class="mywbr"> </span> Parsing and Constructing</a></td></tr><tr><td align="right">10 </td><td><a href="imap.html" class="tocviewlink" data-pltdoc="x">IMAP:<span class="mywbr"> </span> Reading Mail</a></td></tr><tr><td align="right">11 </td><td><a href="pop3.html" class="tocviewlink" data-pltdoc="x">POP3:<span class="mywbr"> </span> Reading Mail</a></td></tr><tr><td align="right">12 </td><td><a href="mime.html" class="tocviewlink" data-pltdoc="x">MIME:<span class="mywbr"> </span> Decoding Internet Data</a></td></tr><tr><td align="right">13 </td><td><a href="base64.html" class="tocviewlink" data-pltdoc="x">Base 64:<span class="mywbr"> </span> Encoding and Decoding</a></td></tr><tr><td align="right">14 </td><td><a href="qp.html" class="tocviewlink" data-pltdoc="x">Quoted-<wbr></wbr>Printable:<span class="mywbr"> </span> Encoding and Decoding</a></td></tr><tr><td align="right">15 </td><td><a href="dns.html" class="tocviewlink" data-pltdoc="x">DNS:<span class="mywbr"> </span> Domain Name Service Queries</a></td></tr><tr><td align="right">16 </td><td><a href="nntp.html" class="tocviewlink" data-pltdoc="x">NNTP:<span class="mywbr"> </span> Newsgroup Protocol</a></td></tr><tr><td align="right">17 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">TCP:<span class="mywbr"> </span> Unit and Signature</a></td></tr><tr><td align="right">18 </td><td><a href="tcp-redirect.html" class="tocviewlink" data-pltdoc="x">TCP Redirect:<span class="mywbr"> </span> <span class="RktSym"><span class="RktStxLink">tcp^</span></span> via Channels</a></td></tr><tr><td align="right">19 </td><td><a href="ssl-tcp-unit.html" class="tocviewlink" data-pltdoc="x">SSL Unit:<span class="mywbr"> </span> <span class="RktSym"><span class="RktStxLink">tcp^</span></span> via SSL</a></td></tr><tr><td align="right">20 </td><td><a href="cgi.html" class="tocviewlink" data-pltdoc="x">CGI Scripts</a></td></tr><tr><td align="right">21 </td><td><a href="cookie.html" class="tocviewlink" data-pltdoc="x">Cookie:<span class="mywbr"> </span> HTTP Client Storage</a></td></tr><tr><td align="right"></td><td><a href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">►</a></td><td>17 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">TCP:<span class="mywbr"> </span> Unit and Signature</a></td></tr></table><div class="tocviewsublistbottom" style="display: none;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">17.1 </td><td><a href="#%28part._.T.C.P_.Signature%29" class="tocviewlink" data-pltdoc="x">TCP Signature</a></td></tr><tr><td align="right">17.2 </td><td><a href="#%28part._.T.C.P_.Unit%29" class="tocviewlink" data-pltdoc="x">TCP Unit</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber">17.1<tt> </tt></span><a href="#%28part._.T.C.P_.Signature%29" class="tocsubseclink" data-pltdoc="x">TCP Signature</a></td></tr><tr><td><a href="#%28form._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">tcp^</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listen%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>listen</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-connect%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>connect</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-connect%2Fenable-break%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>connect/<span class="mywbr"> </span>enable-<wbr></wbr>break</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-accept%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>accept</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-accept%2Fenable-break%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>accept/<span class="mywbr"> </span>enable-<wbr></wbr>break</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-accept-ready~3f%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>accept-<wbr></wbr>ready?</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-close%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>close</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>listener?</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-abandon-port%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>abandon-<wbr></wbr>port</span></span></a></td></tr><tr><td><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-addresses%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp-<wbr></wbr>addresses</span></span></a></td></tr><tr><td><span class="tocsublinknumber">17.2<tt> </tt></span><a href="#%28part._.T.C.P_.Unit%29" class="tocsubseclink" data-pltdoc="x">TCP Unit</a></td></tr><tr><td><a href="#%28def._%28%28lib._net%2Ftcp-unit..rkt%29._tcp~40%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">tcp@</span></span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="nntp.html" title="backward to "16 NNTP: Newsgroup Protocol"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Net: Networking Libraries"" data-pltdoc="x">up</a> <a href="tcp-redirect.html" title="forward to "18 TCP Redirect: tcp^ via Channels"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "net/scribblings/net.scrbl")" x-part-tag=""tcp"">17<tt> </tt><a name="(part._tcp)"></a>TCP: Unit and Signature</h3><p>The <a href="#%28mod-path._net%2Ftcp-sig%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">net/tcp-sig</span></a> and <a href="#%28mod-path._net%2Ftcp-unit%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">net/tcp-unit</span></a>
libraries define a <span class="RktSym"><a href="#%28form._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e%29%29" class="RktStxLink" data-pltdoc="x">tcp^</a></span> signature and <span class="RktSym"><a href="#%28def._%28%28lib._net%2Ftcp-unit..rkt%29._tcp~40%29%29" class="RktValLink" data-pltdoc="x">tcp@</a></span>
implementation, where the implementation uses
<a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</p><p>Some units in the <span class="stt">"net"</span> collection import <span class="RktSym"><a href="#%28form._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e%29%29" class="RktStxLink" data-pltdoc="x">tcp^</a></span>, so
that they can be used with transports other than plain TCP. For
example, <span class="RktSym"><a href="url.html#%28def._%28%28lib._net%2Furl-unit..rkt%29._url~40%29%29" class="RktValLink" data-pltdoc="x">url@</a></span> imports <span class="RktSym"><a href="#%28form._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e%29%29" class="RktStxLink" data-pltdoc="x">tcp^</a></span>.</p><p>See also <span class="RktSym"><a href="tcp-redirect.html#%28def._%28%28lib._net%2Ftcp-redirect..rkt%29._tcp-redirect%29%29" class="RktValLink" data-pltdoc="x">tcp-redirect</a></span> and <span class="RktSym"><a href="ssl-tcp-unit.html#%28def._%28%28lib._net%2Fssl-tcp-unit..rkt%29._make-ssl-tcp~40%29%29" class="RktValLink" data-pltdoc="x">make-ssl-tcp@</a></span>.</p><h4 x-source-module="(lib "net/scribblings/net.scrbl")" x-part-tag=""TCP_Signature"">17.1<tt> </tt><a name="(part._.T.C.P_.Signature)"></a><a name="(mod-path._net/tcp-sig)"></a>TCP Signature</h4><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="#%28mod-path._net%2Ftcp-sig%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">net/tcp-sig</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">net-lib</span></span></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>signature</p></div></div><p class="RForeground"><a name="(form._((lib._net/tcp-sig..rkt)._tcp~5e))"></a><span title="Provided from: net/tcp-sig | Package: net-lib"><span class="RktSym"><a href="#%28form._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e%29%29" class="RktStxDef RktStxLink" data-pltdoc="x">tcp^</a></span></span><span class="hspace"> </span>:<span class="hspace"> </span>signature</p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara"><blockquote class="leftindent"><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-listen))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listen%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-listen</a></span></td><td><span class="hspace"> </span></td><td><span class="RktVar">port-no</span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span>[</td><td><span class="RktVar">max-allow-wait</span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="RktVar">reuse?</span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="RktVar">hostname</span>]<span class="RktPn">)</span></td><td><span class="hspace"> </span></td><td>→</td><td><span class="hspace"> </span></td><td><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="RktValLink" data-pltdoc="x">tcp-listener?</a></span></td></tr></table></blockquote></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="argcontract"><tr><td><span class="hspace"> </span></td><td><span class="RktVar">port-no</span></td><td><span class="hspace"> </span></td><td>:</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exact-nonnegative-integer%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exact-nonnegative-integer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">max-allow-wait</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exact-nonnegative-integer%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exact-nonnegative-integer?</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">4</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">reuse?</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">any/c</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">hostname</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._false%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">false/c</a></span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-listen%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-listen</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-connect))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-connect%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-connect</a></span></td><td><span class="hspace"> </span></td><td><span class="RktVar">hostname</span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="RktVar">port-no</span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span>[</td><td><span class="RktVar">local-hostname</span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="RktVar">local-port-no</span>]<span class="RktPn">)</span></td><td><span class="hspace"> </span></td><td>→</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0"><tr><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._input-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">input-port?</a></span></td><td><span class="hspace"> </span></td><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._output-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">output-port?</a></span></td></tr></table></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">hostname</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="argcontract"><tr><td><span class="hspace"> </span></td><td><span class="RktVar">port-no</span></td><td><span class="hspace"> </span></td><td>:</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exact-nonnegative-integer%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exact-nonnegative-integer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">local-hostname</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._false%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">false/c</a></span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="argcontract"><tr><td><span class="hspace"> </span></td><td><span class="RktVar">local-port-no</span></td><td><span class="hspace"> </span></td><td>:</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exact-nonnegative-integer%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exact-nonnegative-integer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._false%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">false/c</a></span><span class="RktPn">)</span></td></tr></table></td><td><span class="hspace"> </span></td><td>=</td><td><span class="hspace"> </span></td><td><span class="RktVal">#f</span></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-connect%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-connect</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-connect/enable-break))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-connect%2Fenable-break%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-connect/enable-break</a></span></td><td><span class="hspace"> </span></td><td><span class="RktVar">hostname</span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="RktVar">port-no</span></td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span>[</td><td><span class="RktVar">local-hostname</span>]</td><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td><td><span class="hspace"> </span></td><td><span class="RktVar">local-port-no</span><span class="RktPn">)</span></td><td><span class="hspace"> </span></td></tr></table></blockquote></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="prototype"><tr><td><span class="hspace"> </span></td><td>→</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0"><tr><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._input-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">input-port?</a></span></td><td><span class="hspace"> </span></td><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._output-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">output-port?</a></span></td></tr></table></td></tr></table></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">hostname</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="argcontract"><tr><td><span class="hspace"> </span></td><td><span class="RktVar">port-no</span></td><td><span class="hspace"> </span></td><td>:</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exact-nonnegative-integer%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exact-nonnegative-integer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">local-hostname</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._false%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">false/c</a></span><span class="RktPn">)</span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="argcontract"><tr><td><span class="hspace"> </span></td><td><span class="RktVar">local-port-no</span></td><td><span class="hspace"> </span></td><td>:</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._and%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=number-types.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._exact-nonnegative-integer%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">exact-nonnegative-integer?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._false%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">false/c</a></span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-connect%252Fenable-break%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-connect/enable-break</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-accept))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-accept%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-accept</a></span><span class="hspace"> </span><span class="RktVar">listener</span><span class="RktPn">)</span></td><td><span class="hspace"> </span></td><td>→</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0"><tr><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._input-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">input-port?</a></span></td><td><span class="hspace"> </span></td><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._output-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">output-port?</a></span></td></tr></table></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">listener</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="RktValLink" data-pltdoc="x">tcp-listener?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-accept%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-accept</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><table cellspacing="0" cellpadding="0" class="prototype RForeground"><tr><td><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-accept/enable-break))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-accept%2Fenable-break%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-accept/enable-break</a></span><span class="hspace"> </span><span class="RktVar">listener</span><span class="RktPn">)</span></td><td><span class="hspace"> </span></td><td>→</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0"><tr><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._input-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">input-port?</a></span></td><td><span class="hspace"> </span></td><td><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._output-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">output-port?</a></span></td></tr></table></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">listener</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="RktValLink" data-pltdoc="x">tcp-listener?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-accept%252Fenable-break%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-accept/enable-break</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-accept-ready~3f))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-accept-ready~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-accept-ready?</a></span><span class="hspace"> </span><span class="RktVar">listener</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=booleans.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._boolean%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">listener</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="RktValLink" data-pltdoc="x">tcp-listener?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-accept-ready%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-accept-ready?</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-close))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-close%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-close</a></span><span class="hspace"> </span><span class="RktVar">listener</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">listener</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="RktValLink" data-pltdoc="x">tcp-listener?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-close%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-close</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-listener~3f))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-listener~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-listener?</a></span><span class="hspace"> </span><span class="RktVar">v</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=booleans.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._boolean%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">v</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-listener%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-listener?</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-abandon-port))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-abandon-port%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-abandon-port</a></span><span class="hspace"> </span><span class="RktVar">tcp-port</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=void.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._void%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">void?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">tcp-port</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fmisc..rkt%2529._port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">port?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-abandon-port%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-abandon-port</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(sig-val._((lib._net/tcp-sig..rkt)._tcp~5e._tcp-addresses))"></a><span class="RktSym"><a href="#%28sig-val._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e._tcp-addresses%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp-addresses</a></span><span class="hspace"> </span><span class="RktVar">tcp-port</span><span class="hspace"> </span>[<span class="RktVar">port-numbers?</span>]<span class="RktPn">)</span></p></blockquote></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="prototype"><tr><td><span class="hspace"> </span></td><td>→</td><td><span class="hspace"> </span></td><td><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=values.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._values%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">values</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=values.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._values%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">values</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._integer-in%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">integer-in</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">65535</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">tcp-port</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fmisc..rkt%2529._port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">port?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">port-numbers?</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._any%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">any/c</a></span><span class="hspace"> </span>=<span class="hspace"> </span><span class="RktVal">#f</span></td></tr></table></blockquote></div><div class="SIntrapara">Like <span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html%23%2528def._%2528%2528lib._racket%252Ftcp..rkt%2529._tcp-addresses%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">tcp-addresses</a></span> from <a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p></blockquote></div></p><h4 x-source-module="(lib "net/scribblings/net.scrbl")" x-part-tag=""TCP_Unit"">17.2<tt> </tt><a name="(part._.T.C.P_.Unit)"></a><a name="(mod-path._net/tcp-unit)"></a>TCP Unit</h4><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="#%28mod-path._net%2Ftcp-unit%29" class="RktModLink" data-pltdoc="x"><span class="RktSym">net/tcp-unit</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">net-lib</span></span></td></tr></table></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>value</p></div></div><p class="RForeground"><a name="(def._((lib._net/tcp-unit..rkt)._tcp~40))"></a><span title="Provided from: net/tcp-unit | Package: net-lib"><span class="RktSym"><a href="#%28def._%28%28lib._net%2Ftcp-unit..rkt%29._tcp~40%29%29" class="RktValDef RktValLink" data-pltdoc="x">tcp@</a></span></span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym">unit?</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">Imports nothing and exports <span class="RktSym"><a href="#%28form._%28%28lib._net%2Ftcp-sig..rkt%29._tcp~5e%29%29" class="RktStxLink" data-pltdoc="x">tcp^</a></span>, implemented using
<a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=tcp.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="RktSym">racket/tcp</span></a>.</div></p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <a href="nntp.html" title="backward to "16 NNTP: Newsgroup Protocol"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Net: Networking Libraries"" data-pltdoc="x">up</a> <a href="tcp-redirect.html" title="forward to "18 TCP Redirect: tcp^ via Channels"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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