man/man3/dup.html


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

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    dup &ndash; duplicate an open file descriptor<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>int dup(int oldfd, int newfd)<br>
    </font></tt>
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<p><font size=+1><b>DESCRIPTION     </b></font><br>

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    Given a file descriptor, <i>oldfd</i>, referring to an open file, <i>dup</i>
    returns a new file descriptor referring to the same file. 
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    If <i>newfd</i> is &ndash;1 the system chooses the lowest available file descriptor.
    Otherwise, <i>dup</i> will use <i>newfd</i> for the new file descriptor (closing
    any old file associated with <i>newfd</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/dup.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>dup</i> is a preprocessor
    macro defined as <i>p9dup</i>; see <a href="../man3/intro.html"><i>intro</i>(3)</a>.<br>
    
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