DUP(2) System Calls Manual DUP(2)
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 in
the range of legal file descriptors dup will use that for the new file descriptor (closing any old file associated with newfd); if newfd is
-1 the system chooses the lowest available file descriptor.
SOURCE
/sys/src/libc/9syscall
SEE ALSO
intro(2), dup(3)
DIAGNOSTICS
Sets errstr.
DUP(2)
