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Functions HI-TECH C DUP
From HI-TECH C for CP/M Fan WIKI(EN)
DUP
SYNOPSIS
#include <unixio.h> int dup(int fd)
DESCRIPTION
Given a file descriptor, such as returned by open(), this routine will return another file descriptor which will refer to the same open file. -1 is returned if the fd argument is a bad descriptor or does not refer to an open file.
SEE ALSO
open, close, creat, read, write
