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DUP(3)			   Library Functions Manual			DUP(3)

NAME
       dup - duplicate an open file descriptor

SYNOPSIS
       #include	<u.h>
       #include	<libc.h>

       int dup(int oldfd, int newfd)

DESCRIPTION
       Given  a	file descriptor, oldfd,	referring to an	open file, dup returns
       a new file descriptor referring to the same file.

       If newfd	is -1 the system chooses the lowest available file descriptor.
       Otherwise,  dup will use	newfd for the new file descriptor (closing any
       old file	associated with	newfd).

SOURCE
       /usr/local/plan9/src/lib9/dup.c

DIAGNOSTICS
       Sets errstr.

BUGS
       To avoid	name conflicts with the	underlying system, dup is a preproces-
       sor macro defined as p9dup; see intro(3).

									DUP(3)

NAME | SYNOPSIS | DESCRIPTION | SOURCE | DIAGNOSTICS | BUGS

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