man/man3/getenv.html


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<title>getenv(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>GETENV(3)</b><td align=right><b>GETENV(3)</b>
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    <br>
<p><font size=+1><b>NAME     </b></font><br>

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    getenv, putenv &ndash; access environment variables<br>
    
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<p><font size=+1><b>SYNOPSIS     </b></font><br>

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    <tt><font size=+1>#include &lt;u.h&gt;<br>
    #include &lt;libc.h&gt; 
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    <tt><font size=+1>char* getenv(char *name)<br>
    int &nbsp;&nbsp;&nbsp;&nbsp;putenv(char *name, char *val)<br>
    </font></tt>
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<p><font size=+1><b>DESCRIPTION     </b></font><br>

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    <i>Getenv</i> fetches the environment value associated with <i>name</i> into
    memory allocated with <a href="../man3/malloc.html"><i>malloc</i>(3)</a>, 0-terminates it, and returns
    a pointer to that area. If no file exists, 0 is returned. 
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    <i>Putenv</i> sets the environment value associated with <i>name</i> to <i>val</i>.<br>
    
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<p><font size=+1><b>SOURCE     </b></font><br>

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    <tt><font size=+1>/usr/local/plan9/src/lib9/getenv.c<br>
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<p><font size=+1><b>DIAGNOSTICS     </b></font><br>

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    Sets <i>errstr</i>.<br>
    
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<p><font size=+1><b>BUGS     </b></font><br>

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    To avoid name conflicts with the underlying system, <i>getenv</i> and
    <i>putenv</i> are preprocessor macros defined as <i>p9getenv</i> and <i>p9putenv</i>;
    see <a href="../man3/intro.html"><i>intro</i>(3)</a>.<br>
    
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