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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>15.7 Environment Variables</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="extras.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="../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="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" 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class="tocviewlink" data-pltdoc="x">Running Racket</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>15 </td><td><a href="os.html" class="tocviewlink" data-pltdoc="x">Operating System</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">15.1 </td><td><a href="pathutils.html" class="tocviewlink" data-pltdoc="x">Paths</a></td></tr><tr><td align="right">15.2 </td><td><a href="Filesystem.html" class="tocviewlink" data-pltdoc="x">Filesystem</a></td></tr><tr><td align="right">15.3 </td><td><a href="networking.html" class="tocviewlink" data-pltdoc="x">Networking</a></td></tr><tr><td align="right">15.4 </td><td><a href="subprocess.html" class="tocviewlink" data-pltdoc="x">Processes</a></td></tr><tr><td align="right">15.5 </td><td><a href="logging.html" class="tocviewlink" data-pltdoc="x">Logging</a></td></tr><tr><td align="right">15.6 </td><td><a href="time.html" class="tocviewlink" data-pltdoc="x">Time</a></td></tr><tr><td align="right">15.7 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Environment Variables</a></td></tr><tr><td align="right">15.8 </td><td><a href="runtime.html" class="tocviewlink" data-pltdoc="x">Environment and Runtime Information</a></td></tr><tr><td align="right">15.9 </td><td><a href="Command-Line_Parsing.html" class="tocviewlink" data-pltdoc="x">Command-<wbr></wbr>Line Parsing</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">environment-<wbr></wbr>variables?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._current-environment-variables%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">current-<wbr></wbr>environment-<wbr></wbr>variables</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">bytes-<wbr></wbr>environment-<wbr></wbr>variable-<wbr></wbr>name?</span></span></a></td></tr><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._make-environment-variables%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">make-<wbr></wbr>environment-<wbr></wbr>variables</span></span></a></td></tr><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-ref%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">environment-<wbr></wbr>variables-<wbr></wbr>ref</span></span></a></td></tr><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-set%21%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">environment-<wbr></wbr>variables-<wbr></wbr>set!</span></span></a></td></tr><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-names%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">environment-<wbr></wbr>variables-<wbr></wbr>names</span></span></a></td></tr><tr><td><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-copy%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">environment-<wbr></wbr>variables-<wbr></wbr>copy</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._getenv%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">getenv</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._putenv%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">putenv</span></span></a></td></tr><tr><td><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._string-environment-variable-name~3f%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">string-<wbr></wbr>environment-<wbr></wbr>variable-<wbr></wbr>name?</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="time.html" title="backward to "15.6 Time"" data-pltdoc="x">← prev</a> <a href="os.html" title="up to "15 Operating System"" data-pltdoc="x">up</a> <a href="runtime.html" title="forward to "15.8 Environment and Runtime Information"" data-pltdoc="x">next →</a></span> </div><h4 x-source-module="(lib "scribblings/reference/reference.scrbl")" x-part-tag=""envvars"">15.7<tt> </tt><a name="(part._envvars)"></a>Environment Variables</h4><p>An <a name="(tech._environment._variable._set)"></a><span style="font-style: italic">environment variable set</span> encapsulates a partial mapping
from byte strings to bytes strings. A Racket process’s initial
<a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a> is connected to the operating system’s
environment variables: accesses or changes to the set read or change
operating-system environment variables for the Racket process.</p><p>Since Windows environment variables are case-insensitive,
<a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a>’s key byte strings on Windows are
case-folded. More precisely, key byte strings are coerced to a UTF-8
encoding of characters that are converted to lowercase via
<span class="RktSym"><a href="strings.html#%28def._%28%28quote._~23~25kernel%29._string-locale-downcase%29%29" class="RktValLink" data-pltdoc="x">string-locale-downcase</a></span>.</p><p>The current <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a>, which is determined by
the <span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._current-environment-variables%29%29" class="RktValLink" data-pltdoc="x">current-environment-variables</a></span> parameter, is propagated to
a <a href="subprocess.html#%28tech._subproces%29" class="techoutside" data-pltdoc="x"><span class="techinside">subprocess</span></a> when the <a href="subprocess.html#%28tech._subproces%29" class="techoutside" data-pltdoc="x"><span class="techinside">subprocess</span></a> is created.</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="(def._((quote._~23~25kernel)._environment-variables~3f))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">environment-variables?</a></span></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="booleans.html#%28def._%28%28quote._~23~25kernel%29._boolean~3f%29%29" class="RktValLink" 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="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._any%2Fc%29%29" class="RktValLink" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns <span class="RktVal">#t</span> if <span class="RktVar">v</span> is an <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable
set</span></a>, <span class="RktVal">#f</span> otherwise.</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>parameter</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((quote._~23~25kernel)._current-environment-variables))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._current-environment-variables%29%29" class="RktValDef RktValLink" data-pltdoc="x">current-environment-variables</a></span></span><span class="RktPn"></span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></p></blockquote></td></tr><tr><td><span class="RktPn">(</span><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._current-environment-variables%29%29" class="RktValDef RktValLink" data-pltdoc="x">current-environment-variables</a></span></span><span class="hspace"> </span><span class="RktVar">env</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="void.html#%28def._%28%28quote._~23~25kernel%29._void~3f%29%29" class="RktValLink" data-pltdoc="x">void?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">env</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">A <a href="eval-model.html#%28tech._parameter%29" class="techoutside" data-pltdoc="x"><span class="techinside">parameter</span></a> that determines the <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a>
that is propagated to a <a href="subprocess.html#%28tech._subproces%29" class="techoutside" data-pltdoc="x"><span class="techinside">subprocess</span></a> and that is used as the
default set for <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._getenv%29%29" class="RktValLink" data-pltdoc="x">getenv</a></span> and <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._putenv%29%29" class="RktValLink" data-pltdoc="x">putenv</a></span>.</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="(def._((lib._racket/private/misc..rkt)._bytes-environment-variable-name~3f))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">bytes-environment-variable-name?</a></span></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="booleans.html#%28def._%28%28quote._~23~25kernel%29._boolean~3f%29%29" class="RktValLink" 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="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._any%2Fc%29%29" class="RktValLink" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns <span class="RktVal">#t</span> if <span class="RktVar">v</span> is a byte string and if it is valid
for an environment variable name. An environment variable name must
contain no bytes with the value <span class="RktVal">0</span> or <span class="RktVal">61</span>, where
<span class="RktVal">61</span> is <span class="RktPn">(</span><span class="RktSym"><a href="characters.html#%28def._%28%28quote._~23~25kernel%29._char-~3einteger%29%29" class="RktValLink" data-pltdoc="x">char->integer</a></span><span class="stt"> </span><span class="RktVal">#\=</span><span class="RktPn">)</span>. On Windows, an
environment variable name also must have a non-zero length.</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="(def._((quote._~23~25kernel)._make-environment-variables))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._make-environment-variables%29%29" class="RktValDef RktValLink" data-pltdoc="x">make-environment-variables</a></span></span><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span><span class="RktVar">val</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="hspace"> </span><span class="RktMeta">...</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-environment-variable-name?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">val</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="subprocess.html#%28def._%28%28lib._racket%2Fsystem..rkt%29._bytes-no-nuls~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-no-nuls?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Creates a fresh <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a> that is initialized
with the given <span class="RktVar">name</span> to <span class="RktVar">val</span> mappings.</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="(def._((quote._~23~25kernel)._environment-variables-ref))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-ref%29%29" class="RktValDef RktValLink" data-pltdoc="x">environment-variables-ref</a></span></span><span class="hspace"> </span><span class="RktVar">env</span><span class="hspace"> </span><span class="RktVar">name</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fbase..rkt%29._or%2Fc%29%29" class="RktValLink" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._and%2Fc%29%29" class="RktValLink" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="subprocess.html#%28def._%28%28lib._racket%2Fsystem..rkt%29._bytes-no-nuls~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-no-nuls?</a></span><span class="hspace"> </span><span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._immutable~3f%29%29" class="RktValLink" data-pltdoc="x">immutable?</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">env</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-environment-variable-name?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns the mapping for <span class="RktVar">name</span> in <span class="RktVar">env</span>, returning
<span class="RktVal">#f</span> if <span class="RktVar">name</span> has no mapping.</div></p><p>Normally, <span class="RktVar">name</span> should be a byte-string encoding of a string
using the default encoding of the current <a href="encodings.html#%28tech._locale%29" class="techoutside" data-pltdoc="x"><span class="techinside">locale</span></a>. On Windows,
<span class="RktVar">name</span> is coerced to a UTF-8 encoding and case-normalized.</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="(def._((quote._~23~25kernel)._environment-variables-set!))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-set%21%29%29" class="RktValDef RktValLink" data-pltdoc="x">environment-variables-set!</a></span></span></td><td><span class="hspace"> </span></td><td><span class="RktVar">env</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">name</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">maybe-bstr</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">fail</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="data-structure-contracts.html#%28form._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._any%29%29" class="RktStxLink" data-pltdoc="x">any</a></span></td></tr></table></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">env</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-environment-variable-name?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">maybe-bstr</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fbase..rkt%29._or%2Fc%29%29" class="RktValLink" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="subprocess.html#%28def._%28%28lib._racket%2Fsystem..rkt%29._bytes-no-nuls~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-no-nuls?</a></span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="argcontract"><tr><td><span class="hspace"> </span></td><td><span class="RktVar">fail</span></td><td><span class="hspace"> </span></td><td>:</td><td><span class="hspace"> </span></td><td><span class="RktPn">(</span><span class="RktSym"><a href="function-contracts.html#%28form._%28%28lib._racket%2Fcontract%2Fbase..rkt%29._-~3e%29%29" class="RktStxLink" data-pltdoc="x"><span class="nobreak">-></span></a></span><span class="hspace"> </span><span class="RktSym"><a href="data-structure-contracts.html#%28form._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._any%29%29" class="RktStxLink" data-pltdoc="x">any</a></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" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="lambda.html#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._lambda%29%29" class="RktStxLink" data-pltdoc="x">lambda</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="exns.html#%28def._%28%28quote._~23~25kernel%29._raise%29%29" class="RktValLink" data-pltdoc="x">raise</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="exns.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._make-exn~3afail%29%29" class="RktValLink" data-pltdoc="x">make-exn:fail</a></span><span class="hspace"> </span><span class="RktSym">....</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Changes the mapping for <span class="RktVar">name</span> in <span class="RktVar">env</span> to
<span class="RktVar">maybe-bstr</span>. If <span class="RktVar">maybe-bstr</span> is <span class="RktVal">#f</span> and
<span class="RktVar">env</span> is the initial <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a> of the
Racket process, then the operating system environment-variable mapping
for <span class="RktVar">name</span> is removed.</div></p><p>Normally, <span class="RktVar">name</span> and <span class="RktVar">maybe-bstr</span> should be a
byte-string encoding of a string using the default encoding of the
current <a href="encodings.html#%28tech._locale%29" class="techoutside" data-pltdoc="x"><span class="techinside">locale</span></a>. On Windows, <span class="RktVar">name</span> is
coerced to a UTF-8 encoding and case-normalized, and
<span class="RktVar">maybe-bstr</span> is coerced to a UTF-8 encoding if <span class="RktVar">env</span> is
the initial <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a> of the Racket process.</p><p>On success, the result of <span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-set%21%29%29" class="RktValLink" data-pltdoc="x">environment-variables-set!</a></span> is
<a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=guide&rel=void_undefined.html&version=6.1" class="RktModLink Sq" data-pltdoc="x"><span class="nobreak"><span class="RktRes">#<void></span></span></a>. If <span class="RktVar">env</span> is the initial <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment
variable set</span></a> of the Racket process, then attempting to adjust the
operating system environment-variable mapping might fail for some reason,
in which case <span class="RktVar">fail</span> is called in tail position with respect to the
<span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-set%21%29%29" class="RktValLink" data-pltdoc="x">environment-variables-set!</a></span>. The default <span class="RktVar">fail</span> raises
an exception.</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="(def._((quote._~23~25kernel)._environment-variables-names))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-names%29%29" class="RktValDef RktValLink" data-pltdoc="x">environment-variables-names</a></span></span><span class="hspace"> </span><span class="RktVar">env</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._listof%29%29" class="RktValLink" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._and%2Fc%29%29" class="RktValLink" data-pltdoc="x">and/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-environment-variable-name?</a></span><span class="hspace"> </span><span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._immutable~3f%29%29" class="RktValLink" data-pltdoc="x">immutable?</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">env</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns a list of byte strings that corresponds to names mapped by
<span class="RktVar">env</span>.</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="(def._((quote._~23~25kernel)._environment-variables-copy))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-copy%29%29" class="RktValDef RktValLink" data-pltdoc="x">environment-variables-copy</a></span></span><span class="hspace"> </span><span class="RktVar">env</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">env</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables~3f%29%29" class="RktValLink" data-pltdoc="x">environment-variables?</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns an <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a> that is initialized with
the same mappings as <span class="RktVar">env</span>.</div></p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><table cellspacing="0" cellpadding="0" class="together"><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="(def._((lib._racket/private/misc..rkt)._getenv))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._getenv%29%29" class="RktValDef RktValLink" data-pltdoc="x">getenv</a></span></span><span class="hspace"> </span><span class="RktVar">name</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fbase..rkt%29._or%2Fc%29%29" class="RktValLink" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="subprocess.html#%28def._%28%28lib._racket%2Fsystem..rkt%29._string-no-nuls~3f%29%29" class="RktValLink" data-pltdoc="x">string-no-nuls?</a></span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._string-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">string-environment-variable-name?</a></span></td></tr></table></td></tr><tr><td><table cellspacing="0" cellpadding="0" class="together"><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="(def._((lib._racket/private/misc..rkt)._putenv))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._putenv%29%29" class="RktValDef RktValLink" data-pltdoc="x">putenv</a></span></span><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span><span class="RktVar">value</span><span class="RktPn">)</span><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktSym"><a href="booleans.html#%28def._%28%28quote._~23~25kernel%29._boolean~3f%29%29" class="RktValLink" data-pltdoc="x">boolean?</a></span></p></blockquote></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">name</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._string-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">string-environment-variable-name?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">value</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktSym"><a href="subprocess.html#%28def._%28%28lib._racket%2Fsystem..rkt%29._string-no-nuls~3f%29%29" class="RktValLink" data-pltdoc="x">string-no-nuls?</a></span></td></tr></table></td></tr></table></blockquote></div><div class="SIntrapara">Convenience wrappers for <span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-ref%29%29" class="RktValLink" data-pltdoc="x">environment-variables-ref</a></span> and
<span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._environment-variables-set%21%29%29" class="RktValLink" data-pltdoc="x">environment-variables-set!</a></span> that convert between strings and
byte strings using the current <a href="encodings.html#%28tech._locale%29" class="techoutside" data-pltdoc="x"><span class="techinside">locale</span></a>’s default encoding (using
<span class="RktVal">#\?</span> as the replacement character for encoding errors) and
always using the current <a href="#%28tech._environment._variable._set%29" class="techoutside" data-pltdoc="x"><span class="techinside">environment variable set</span></a> from
<span class="RktSym"><a href="#%28def._%28%28quote._~23~25kernel%29._current-environment-variables%29%29" class="RktValLink" data-pltdoc="x">current-environment-variables</a></span>. The <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._putenv%29%29" class="RktValLink" data-pltdoc="x">putenv</a></span> function
returns <span class="RktVal">#t</span> for success and <span class="RktVal">#f</span> for failure.</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="(def._((lib._racket/private/misc..rkt)._string-environment-variable-name~3f))"></a><span title="Provided from: racket/base, racket | Package: base"><span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._string-environment-variable-name~3f%29%29" class="RktValDef RktValLink" data-pltdoc="x">string-environment-variable-name?</a></span></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="booleans.html#%28def._%28%28quote._~23~25kernel%29._boolean~3f%29%29" class="RktValLink" 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="data-structure-contracts.html#%28def._%28%28lib._racket%2Fcontract%2Fprivate%2Fmisc..rkt%29._any%2Fc%29%29" class="RktValLink" data-pltdoc="x">any/c</a></span></td></tr></table></blockquote></div><div class="SIntrapara">Returns <span class="RktVal">#t</span> if <span class="RktVar">v</span> is a string and if its encoding
using the current <a href="encodings.html#%28tech._locale%29" class="techoutside" data-pltdoc="x"><span class="techinside">locale</span></a>’s encoding is valid for an environment
variable name according to <span class="RktSym"><a href="#%28def._%28%28lib._racket%2Fprivate%2Fmisc..rkt%29._bytes-environment-variable-name~3f%29%29" class="RktValLink" data-pltdoc="x">bytes-environment-variable-name?</a></span>.</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="time.html" title="backward to "15.6 Time"" data-pltdoc="x">← prev</a> <a href="os.html" title="up to "15 Operating System"" data-pltdoc="x">up</a> <a href="runtime.html" title="forward to "15.8 Environment and Runtime Information"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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