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dup2
====

Syntax
------

     #include <unistd.h>
     
     int dup2(int existing_handle, int new_handle);

Description
-----------

This call causes NEW_HANDLE to refer to the same file and file pointer
as EXISTING_HANDLE.  If NEW_HANDLE is an open file, it is closed.

Return Value
------------

The new handle, or -1 on error.

Example
-------

     /* copy new file to stdin stream */
     close(0);
     dup2(new_stdin, 0);
     close(new_stdin);