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| <tr><td width=20><td><b>DUP(3)</b><td align=right><b>DUP(3)</b> |
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| <p><font size=+1><b>NAME </b></font><br> |
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| dup – 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 <u.h><br> |
| #include <libc.h> |
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| <tt><font size=+1>int dup(int oldfd, int newfd)<br> |
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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 –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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