DUP(3) 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
/src/lib9/dup.c
DIAGNOSTICS
Sets errstr.
BUGS
To avoid name conflicts with the underlying system, dup is a
preprocessor macro defined as p9dup; see intro(3).